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SKYTRON 3500 O/R Table Service Manual

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2. Wiring Diagram Model 35008 Page 640 7 2 22 2272 77 7 227777 IC7 CN6 CN5 1 1 1 9 Ez 10 TS 53 Ads 6961 sv RL2 3 1 ELEV 5 102 5 104 y Peg T 31 P sva 1 5 Pte 2 1 015 2 2 e flere 12 in ME AN T RL3 i T 11 RL2 perg HN 5 1 1 IH 22 9 lt 1615 14 13 121 1111019 10 1 10 Uta 3 1 8 i 2 082 OSCC2 SPI 2 3 4 9 Qo 8 gt lt Len 2 Pu ALS Pa 7 1 TREND 1 2109149 7 DI s t yep lt EZ 1 AS r T 3 5 rl E a 2 084 12 3456 6 15 4 7 05 eet 6 02 0121 RL4 5 8T
3. AUXILIARY 4 55 pu 9 jr 8 A TS1 CN1 5 i 5 RELAY BOX RETURN CIRCUIT AUXILIARY rh TS2 SWITCHES CN2A PLUR CN10 m CN2B CHARGER BOX BATTERIES Na CAPACITOR 26 SWITCH OVER RELAY CN16 CN15 22 VAC FROM TRANSFORMER C P 120 VAC TO TRANSFORMER CN51 FUSE CHARGER 15 c O BOX 5 CN12 CN14 M POWER ll CORD 5 MAIN e SEA POWER SWITCH ICN1 FUSE 10 BATTERY CHARGE INDICATOR Figure 6 2 Electrical Circuit Block Diagram Model 3500B Page 43 35008 Check the continuity from the power cord connec tor ICN1 through the fuses switch and wiring to connector CN12 Remove the power cord discon nect CN12 black and white wires and test as shown in figure 6 3 TO GROUND ICN1 Figure 6 3 CN12 to ICN1 Continuity Test 6 4 Batteries The BATTERY operating mode is powered
4. Tm CS 4 Slide Inhibit Test at pins 8 amp 15 Table Switch Meter Position Position Reading Open Infinity Closed 0 When Leg Section is more than 45 below horizontal CS 4 will not allow Top to Slide toward head Figure 6 31 Slide to Head Inhibit Switches Ta amp NO ORANGE WHITE _ COM PURPLE 7 CS 5 Slide Inhibit Test at pins 12 amp 15 Table Switch Meter Position Position Reading Back Up Less Than 45 Open Infinity Back Up More Than 45 Closed 0 When Back Section is more than 45 above hori zontal CS 5 will not allow Kidney Lift to operate Figure 6 32 Kidney Lift Inhibit Switches Page 58 b Switch Adjustment If proper readings are not obtained during test or if 3 To adjust the Leg Section switches loosen table does not properly return to level use the the jam nuts adjust the switch and tighten the jam following procedure to adjust the switches nuts See figure 6 34 1 Apply table brakes and using a level level PHILLIPS HEAD using SCREWS the table top using the TRENDELENBURG and LATERAL TILT function buttons on the pendant control 2 For all switches except the Leg Section switches carefully loosen the switch retaining screws and adjust the switches as needed See figure 6 33 RETAINING SCREWS Figure 6 34 Leg Section Micro Swit
5. 9 G Pressure Relier Valves tend e dba debo ehe e ee tea d 9 d Speed rmt d Me 9 SECTION II MECHANICAL TABLE ADJUSTMENTS esee enne nre raa nicis 11 2 1 Back Section Gear Mesh 11 2 2 Hydraulic 11 avc Back Section iu cae eire ture vut ud redd df eel debate darte 11 b eere t inc aiaa i qas Seta Tie Peau ee and dd Bee nds 11 c Slide and Kidney Lift Cylinders reete teet panier habcre etti Ho eee eH RU ERR ERAEN 12 2 3 Slide Roller Adjustment riroraa interea atien ie eter 12 SECTION III HYDRAULIC TROUBLESHOOTING nennen enhn nennen tenet nensis nennen nnns nee 13 3212 13 3 2 Troubleshooting ciii Ep ct rte ele 13 3 3 ELEVATION DIAGNOSIS 14 3 4 TRENDELENBURG DIAGNOSIS 15 35 EATEBAE TICF DIAGNOSIS OHAR T tian ae te Re ine Een e ERES 16 3 6 BACK SECTION DIAGNOSIS CHART 17 3 7
6. NS 3 Lateral Tilt Left NS 4 Lateral Tilt Right Test at pins 3 amp 15 Test at pins 4 amp 15 Table Switch Meter Table Switch Meter Position Position Reading Position Position Reading Open Infinity Open Infinity Open Infinity Closed 0 Closed 0 Open Infinity When table is inTilt Left Position NS 3 When table is in Tilt Right Position NS 4 brings the top back to level brings the top back to level Figure 6 26 Lateral Tilt Return Switches Page 55 When 10 is disconnected DOWN function will not operate NS 5 Back Section Down Test at pins 5 amp 15 Switch Meter Position Reading Closed 0 Open Infinity Closed 0 Table Position When the Back Section is Down NS 5 brings the Back Section Up to level and will not allow Top Slide toward foot 2 CN 10 NS 6 RED WHITE PINK TS 1 NS 6 Back Section Up Test at pins 6 amp 15 Switch Meter Position Reading Open Open Table Position Infinity Infinity Closed 0 When the Back Section is Up NS 6 brings the Back Section Down to level Figure 6 27 Back Section Return Switches CN 10 NS 7 NS 7 1 BROWN NC NO O COM Leg Section Down Test at p
7. Checking Relay Box Input Power 1 Connect power cord to table Plug the power cord into 120 supply wall receptacle Disconnect connector CN4 leave all other con nectors connected 2 Using a DC voltmeter test input power for both the BATTERY and AC120V operating modes See figure 6 15 Meter should read approximately 24 28 volts BATTERY mode AC120V mode Main Power OFF Main Power ON 1 5 pin2 pin 6 Connector CN4 Color Code Pin 1 Red Pin 5 White Pin 2 Blue Pin 6 Black Pin 3 Yellow Pin 7 Yellow Pin 4 Blue DCV Figure 6 15 Relay Box Input b Test Results If you do not receive the correct meter readings the problem is in the input wiring connectors or components If the correct readings are obtained proceed to the next step c Checking Output to Pump 1 Disconnect pump connector CN15 connect all other connectors and activate the AC120V operating mode 2 Test CN15at pin 1 and pin 2 with a DC voltmeter Meter should read approximately 24 28 volts when any function button is activated If no voltage is present use an ohmmeter to test the continuity from CN15 to CN4 yellow and blue wires Refer to figure 6 15 for CN4 pin locations 3500B d Checking Output to Solenoids This test checks the voltage that is used to energize the solenoids 1 Activate either BATTERY or AC120V oper ating mode NOTE The Brake Lock fu
8. 3500B BLUE BROWN BLUE BLUE BLUE BLUE BLUE BLUE WHITE UN Lock LOCK BLACK BLUE BLUE GREY BLUE BLUE BLUE BLUE BLUE ORANGE BROWN WHITE WHITE BROWN WHITE GREY PURPLE BLUE WHITE BLUE WHITE PURPLE BLUE WHITE RED WHITE WHITE ORANGE YELLOW WHITE RED 3 Use a DC voltmeter and measure the voltage across the 2 pin connector Pin 1 and pin 2 Meter should read approximately 24 28 volts NOTE eThe appropriate pendant control but ton must be pushed during this test The motor will run when this test is performed and the brake locking sole noid will be activated by any function other than MOVE elf a solenoid does not function when the pendant control button is pushed the problem could be the pendant con trol the relay box or the solenoid c Test Results If you do not receive the correct voltage the prob lem could be in the wires leading down to the connector The problem could also be in the relay box or the Pendant Control refer to appropriate section for troubleshooting Ifthe correct voltage is obtained everything is good up to that point and the problem is more than likely the solenoid BLUE WHITE BLUE BLUE BLUE WHITE BLACK Figure 6 20 Solenoid Test Page 51 4 Test 2 The solenoid can be checked out
9. CN 29 F1 1 Swi 10A F2 FH2 1 115 200W P 15 60Hz i 180 754F CNS 1 1 CN 21 Tre 3 Sv 2 NM CN 22 Ho 6 sva d CN 23 7 8 5 4 bd CN 24 79 5 SV 5 b S CN25 TTS9 13 1 5 6 bd CN 26 TTA 13 8 5 7 CN 27 D 1 42 45 8 8 CN 28 16 2 z 1 1 SV 9 3 sv 10 CN 30 0 svn 790 7 1 5 12 D na 79 8 1 5 13 CN 33 T TAY 13 8 SV 14 NA CN 34 1 02 3 8 sv 15 MT CN 35 D sv 16 gt CN 36 1 49 8 54 17 CN 37 149 9 5 18 md CN 38 Tee L d amp MNPC 33B gt 3 R9 1 x 6 RES 2i 6 6 2 sRL 42 P I ud 9 RL 42 8 8 23 8 gt RL 41 H 49 gt Tr 43 9 4 5 Bm 49 Lo D osRL 29 19 D psw2 hi7 ow 9 7 e I a9 S s T lt lt NE 9 9 8 9 SPA e E 49 10 _ 1111 1 0 R10 Q 60 9 e 63 e 4 L 9 G RL 39 NS 1HEAD WN LEVEL T
10. 52 6 13 Return to Level Micro Switches 53 6 14 Return Inhibit System Troubleshooting 54 SECTION VII 3500B BATTERY MODEL ELECTRICAL SYSTEM 60 7 1 Relay Box Adjustments Ov 60 SECTION HYDRAULIC SYSTEM 1 1 General Electro Hydraulic System The hydraulic system with the exception of the hydraulic cylinders and hoses is contained within the base of the table The hydraulic valves and pump are electrically controlled by the use of a a ELEVATION PLUMBING fed hand held push button pendant control The power requirements for the table are 120 VAC 5 amp 60 Hz The table contains the following components Re fertothe block diagram figure 1 1 for relationship l KIDNEY 1 1 SIDE FRAME l l KIDNEY 0 1 RIGHT a SIDE FRAME l BRAKE SYSTEM BRAKE 1 uri Ae ow rj ASS e TM P oP oP 6 MOTOR PUMP a ELEV TREND TILT FLEX BACK SLIDE MINI VALVES Figure 1 1 Hydraulic Block Diagram Page 1 Oil Reservoir supply Approximately two quarts b Motor Pump Assembly A positive displace ment gear type pump provides the necessary oil pressure and volume c Pressure Relief Valve Provides an alternate oil path when
11. CS 2LEG DO WN Lee mus O sae x PROHIBIT rai O z CS 3PR OHIBIT BACK UP E i 5 FH032 T 2 4TyF RL40 0 at 280468 220 8 x ike 1 UL CSA AC sw TRI R55 1 RL 33 CORD 1 CNIS 5 1 4 3 0 0 1 2 POWER 1 lt M y 1 1 6 4 100v 281815 J ogi Sires 18 zw csi 2 0 2 2 2 200VA x 1 VRS1 BR252 RL 40 2 T 3P 0 E lt T 1 T
12. RELAY BOX MNPC 32 lel R7 Q HOSPITAL GRADE PLUG RL 33 CN5 8 2 ES 9 o2 MEC 13 M 9 6 EC 0 4 RL 22 dT BRAKE 1 sETCOIL TIMER BRAKE 7 RESET COIL TIMER
13. CE FEF is Y HE A A ACI E ELITE SERIES SURGICAL TABLES MAINTENANCE MANUAL MODEL ELITE 3500 AND 3500B TABLE CONTENTS SEGTION THY DRAULIG SYSTEM itte teat ee etd e atis 1 IELC rc 1 1 2 ComponentOJpefaltlOn eic t t M er tib ette cen tel RUE EUER pr pae c 2 Motot P mp Operation eti edi he es etas 2 b 11 1 21011 35 11 1811 11 2 MINEValVeS 3 d Mini Valve in Neutral Position 3 e Mini Valve Right Port Activated 4 t Port Activated 2 eicit din reiecit cernes etr eee Cer yeas 4 g Hydraulic Cylinders Slave Cylinders 5 h Elevation Cylinder Return 7 I Brake Systema sene de tet ete E m Im ona DLE 7 j 111 112 12 1 1 15 1 21 8 System cn tec ee ve da ce yi ce f nee Ae ini 8 153 Hydraulic Adjustment Sis uoce rre rro re re pL edv I Dogs 9 Fluid eet esee tenth E ot ei e e eet tetur t e etu rx pater dee ERE 9 b Bleeding The Hydraulic System
14. The right speed adjustment controls the speed of the table function by restrict ing the amount of oil going back to the reservoir 9 Hydraulic Cylinders Slave Cylinders There are several different types of hydraulic cylin ders used in the table that activate the control functions With the exception of the elevation and brake cylinders all operate basically the same way The control functions are listed below See figure 1 8 Trendelenburg 1 double action cylinder Back Section 2 double action cylinders Leg Section 2 double action cylinders Slide 1 double action cylinder Kidney Lift 2 double action cylinders Lateral Tilt 1 double action cylinder Elevation 1 single action cylinder Brakes 4 single action cylinders BACK SECTION AN CYLINDER 7 LEG SECTION bee CYLINDER LATERAL TILT CYLINDER LIDE CYLINDER KIDNEY LIFT CYLINDER TRENDELENBURG CYLINDER ELEVATION 7 3 CYLINDER Figure 1 8 Cylinder Placement 1 Trendelenburg Back Section and Leg Sec tion Cylinders The double action cylinders are closed at one end and have a movable piston with hydraulic fluid on both sides Connected to this piston is a ram or shaft that exits out of the other end of the cylinder Through the use of either a ball and socket a gear or clevis and pin arrangement the ram is connected to a movable table surface The movable surface can be moved one
15. adjustment is required Page 11 To adjust Loosen the cam locking set screws located on the bottom of the cylinder mounting plates inside the table side frames Use an allen wrench to turn the cylinder eccentric cams as required to shift either cylinder fore or aft as needed so no twisting or flexing of the leg section is observed when it is stalled in the horizontal position Tighten set screws when proper adjustmentis achieved See figure 2 LEG SECTION LEG SECTION CYLINDER ECCENTRIC CAM SET SCREW Figure 2 3 Leg Section Adjustment c Slide and Kidney Lift Cylinders If the Slide or Kidney Lift cylinder has been re moved the distance from the end of the piston to the end of the cylinder housing must be checked to make sure the functions will operate correctly With table top centered the distance from the end of the Slide piston to end of cylinder is Head End 82 mm Foot End 120 mm The table top should slide 7 1 2 toward the head and 13 1 4 toward the foot when positioned prop erly Refer to figure 2 4 With Kidney Lift all the way down the distance from the end of the Kidney Lift piston to end of cylinder is Head End 82 mm Tail End 11 mm 2 3 Slide Roller Adjustment The pivot pins on the slide rollers are eccentric cams The rollers can be adjusted if required to maintain proper top slide operation To adjust Remove the Seat section top the hose cover and the right and left late
16. pressure and close the bypass valve tighten the Screw b Cylinder Adjustment If either of the kidney lift cylinders reaches the end of the down stroke before the other one an adjustment is needed Use the following procedure to adjust the system 1 If the right side bottoms out before the left side open the bypass valve and activate KIDNEY DOWN to align the cylinders 2 If the left side bottoms out before the right side activate KIDNEY UP to raise the cylinders When the cylinders are at the full up position open the valve and activate KIDNEY UP to align the cylinders Close the valve before lowering the cylinders 3 When the adjustment is complete make sure the cylinders are completely down activate KIDNEY DOWN and tighten the valve Page 25 SECTION IV ELECTRICAL SYSTEM 4 1 General The complete electrical system with the excep tion of the hand held pendant control andthe return circuit micro switches is contained within the base of the table The pump motor and the hydraulic valves are controlled electrically with the pendant control The electrically operated functions are as follows TRENDELENBURG Head up and down LATERAL TILT Right and left BACK SECTION Up and Down ELEVATION Up and Down TOP SLIDE LEG SECTION Up and Down FLEX REFLEX KIDNEY LIFT Up and down RETURN TO LEVEL BRAKE UNLOCK Brake release The power requirements are 120 VAC 60 Hz fuse pro
17. 2 SLIDE BACK DOWN INHIBIT CS 3 KIDNEY BACK 45 UP INHIBIT CS 4 LEG DOWN 45 SLIDE INHIBIT CS 5 BACK UP 45 KIDNEY UP INHIBIT Figure 5 12 Page 35 50 0 micro switches operate on low voltage and control the function circuits pump motor and ap propriate solenoid valves when activated by the pendant control RETURN button The micro switches are wired to the relay box through 2 terminal strips a riser cord and the 15 pin connector CN2 See figure 5 12 for switch location and identification 5 8 Return Inhibit System Troubleshooting problem is suspected in the return circuits disconnect the connector CN2 from the Relay Box to eliminate the circuits Ensure that all table functions operate properly using the Pendant Con trol If the functions do not work properly using the Pendant Control refer to the appropriate test sec tion and make all needed repairs before working on the return circuits NOTE Itis normal for the back section to move up if the RETURN button is pushed when connector CN2 is disconnected from the relay box All of the micro switches are connected to the relay box via a wiring harness and the micro switch riser cord from terminal strips 1 and 2 to connector CN2 The terminal strips are located under the hose cover on the top of the elevation column Connector CN2 plugs into the relay box and is the most convenient location to make circuit continuity checks See fig 5 13 for connector
18. BACK UP BACK DOWN sw4 KIDNEY DOWN KIDNEY UP SW5 LEG UP LEG DOWN PUMP MOTOR SW6 2 9 9 9 9 9 24V Figure 6 14 Auxiliary Switch Test 6 9 Relay Box The power supply is directly connected to the relay contacts When these contacts are closed 24 volts is supplied to the solenoids which are mounted on the hydraulic mini valves One relay is used to supply power to the pump motor and is always activated no matter what control function is se lected The brake locking circuit relay is also activated when any control function other than BRAKE UNLOCK is initially selected Also inside the 3500B relay box is a step down transformer and full wave rectifier which decreases the voltage to 5 6 volts This low voltage potential controls the relays by the use of the hand held pendant control buttons Basically the relays en able a 5 6 volt potential to control the 24 volt circuit The following tests will determine if the relay box is functioning correctly B8 B2 8 8 4 B8 A1 8 7 B8 B6 lt lt EE Um B8 A2 B8 B3 B8 B4 B8 B1 8 7 8 6 White Red Brown White Purple Yellow Purple Orange Grey White Orange White Grey White Brown Red White Blue White Pink Figure 6 13 Auxiliary Switch Connector CN3 0 5
19. E PATI F 4 oo 1 qe 35 27 p 8 93 5 5 10 2 085 np 28 19 284 gt gt lt RB R9 22128 05 RLS aRL6 ai 1 m 06120 i 7 lt 516 a ev 25 n E 5 016 aan 07 1 18 2 ce ones 12 3 15 RL 6 RL 7 GND 4 2 38 E 12 mL IC8 0 Sp Le Sv Ed TC4514BP 1 peus T 1 LM 2 QU A15 OE RL 7 RL 8 FLEX 15 2 ER oet 1 58 1 8 8 HN27C101AG 10 57 gt 1 2 Ones 1 1011 xm Pt Deter 4 CN2A T 1 1 one Y T x ET ivi 2 5v RL 1 10 3 1 p c19 t oe top SVO e i 10 10 N30 ARSM ur 2 ai RL25 ni 8 sv RL 10 5 1 T lt svn d M ROS 11 wA 2 08 4 GND 1 Le R lt e SLIDE 06 i 7 E 7 1 RL 37 T 2 1 Da gt lt E 342 105 5 Bis yn 13 2 ce he n 1 1 I T 083 lt 13 13 an 1 2 000 10 7 7 1 i K BRIDGE 00 1 E IC6 T T D lt Sv T 14 14 71 P ICo 2 2 3 RL 14 RLAS 1 uen 02 18 n 35 7 21 18 Det 15 15 wi PR HP2 17 Dorat Y 34 gt lt 1 2 20 PLAS SRLAS is 1 LEG HP3 19 Pots gt lt SV16 M Dott 16 16 mi 13 Pt RL 16 gt RN2 1 16 Beret 5 17 1 T 15 Del ret 8828 o ui lt 8947 12 n D Wy 17 An 18 2 7
20. be adjusted at the individual switch mounting brackets See figure 6 23 The micro switches operate on low voltage and control the function circuits pump motor and ap propriate solenoid valves when activated by the pendant control RETURN button The micro switches are wired to the relay box through 2 terminal strips a riser cord and the 15 pin connector CN10 See figure 6 23 for switch loca tion and identification CS 1 54 NS 1 TREND NS 2 REV TREND NS 3 TILT LEFT NS 4 TILT RIGHT NS 5 BACK DOWNTO LEVEL SLIDE INHIBIT NS 6 BACK UPTO LEVEL NS 7 LEG DOWN TO LEVEL CS 1 SLIDE LEG DOWN INHIBIT CS 2 SLIDE BACK DOWN INHIBIT CS 3 KIDNEY BACK 45 UP INHIBIT CS 4 LEG DOWN 45 SLIDE INHIBIT CS 5 BACK UP 45 KIDNEY UP INHIBIT Figure 6 23 Page 53 35008 6 14 Return Inhibit System Troubleshooting If a problem is suspected in the return circuits disconnect the connector CN10 from the Relay Box to eliminate the circuits Ensure that all table functions operate properly using the Pendant Con trol If the functions do not work properly using the Pendant Control refer to the appropriate test sec tion and make all needed repairs before working on the return circuits NOTE Itis normal for the back section to move up if the RETURN button is pushed when connector CN10 is disconnected from the relay box All of the micro switches are connected to the relay box via a wiring harness and the micro switch ri
21. before brakes will lock again If the emergency brake release valve is open or loose two conditions could occur Page8 1 The brakes will release slowly depending on how loose the valve is this could take anywhere from a few minutes to several hours 2 None of the table functions will operate properly if the valve is wide open All of the hydraulic fluid from the pump is simply pumped through the brake bypass circuit because that is the easiest path for the oil to follow k Flex Reflex System The Flex Reflex system has a mini valve which connects the trendelenburg and back section hy draulic systems in a series When FLEX is acti vated by the pendant control the Flex Reflex mini valve opens the oil pressure path to the Reverse Trendelenburg piston The return oil path from the trendelenburg piston is routed through the back section cylinder to the mini valve return port See figure 1 18 TREND BACK UP REV TREND PLUMBING TERMINAL FLEX REFLEX MINI VALVE Figure 1 18 Flex Reflex System 1 3 Hydraulic Adjustments a Fluid Level The fluid level should be approximately 1 2 below the filler hole or gasket surface If additional fluid is needed remove the filler vent cap with a phillips screwdriver and add fluid through this opening using a funnel See figure 1 19 NOTE The elevation cylinder should be com pletely down and all the
22. by two 12 volt batteries connected in series to provide the 24 volt operating power The battery system voltage should be 24VDC ata range of 22VDC to 26VDC If the battery charge level falls below 23 5 volts the BATTERY operation indicator on the pendant control will blink indicating that the batteries require recharging The built in charging system automatically keeps the batteries at the proper charge level when the AC120V oper ating mode is ON The charging system will operate while the table is being operated in the AC120V mode a Battery System Test 1 Disconnect the main power cord and using a DC voltmeter test each individual battery at its terminals Meter should read 12VDC 1V 2 To accurately test the batteries they must be tested under a full load Disconnect the main power cord and make sure all other connectors are connected 3 Turn BATTERY power ON and elevate the table to its full up position Page 44 4 Continue to press the TABLE UP button on the pendant control so that the pump motor contin ues to run and using a DC voltmeter check the voltage drop of each battery individually See figure 6 4 5 Meter should read 12VDC 1VDC Figure 6 4 b Test Results A reading of 11 volts or below indicates the battery needs charging After batteries have been fully charged repeat the fullload test If either battery s voltage drops below 11VDC i
23. connector 4 Meter should read 26 5 1VDC if charger is operating If batteries are fully charged there willbe under 5 volts at pins 5 and 6 d Test Results If you do not receive the correct readings the charger system connectors wires or the trans former may be defective e Charging System Output Adjustment If output reading at pins 3 and 4 is not 26 5 1 VDC the output can be adjusted at the variable resistor VR 51 onthecircuitboard inside the Charging Box See figure 6 7 Turn the adjuster clockwise to decrease the voltage Counterclockwise to in crease the voltage NOTE The battery connectors must be dis connected to adjustthe battery charger output VR51 Figure 6 7 Page 45 6 6 Switch Over Relay a Switch Over Relay in OFF Position The Switch Over Relay supplies the 24 volt input power from either the BATTERY or AC120V operating modes to the relay box for table operation In the normal OFF position BATTERY power is supplied to the relay box See figure 6 8 RELAY BOX 8 0 RELAY FUSE 15A BATTERY Figure 6 8 Relay in OFF Position b Switch Over Relay in Activated Position When the AC120V mode is activated by the main switch a signal from the relay box activates the Switch Over Relay The relay then supplies the AC operating mode o
24. other control functions in their neutral position when checking oil level Figure 1 19 The type of oil that should be used is Mobil DTE 25 or equivalent This is a very high quality hydraulic oil The table requires approximately two quarts of oil to operate properly b Bleeding The Hydraulic System To purge the air from the hydraulic system operate each function back and forth at least two or three times NOTE Whenever a hydraulic line or com ponent is replaced bleed the air out of the lines using the pump pressure be fore making the final connection Then operate the function until it stalls in both directions c Pressure Relief Valve The pressure relief valve is adjusted by turning the adjustment nutuntil the desired pressureis reached To adjust 1 Remove the plumbing bolt securing the brake system line to the pressure relief valve and attach a hydraulic pressure gauge as shown in figure 1 20 using a long plumbing bolt PRESSURE RELIEF VALVE PRESSURE GAUGE LONG 6 mm PLUMBING BOLT Figure 1 20 2 Raise the table top until the piston reaches the end of its stroke and stalls Observe reading on pressure gauge and turn the adjustment nut clockwise to increase oil pressure counter clockwise to decrease until desired reading is obtained Pressure should be 80KG CM 1138 PSI d Speed Controls The speed controls restrict the volume of oil return ing back to the reservoir the
25. out Certain defective components could cause the entire table to stop functioning or only one control function to stop It would depend on what part of the component failed Other defective components would only cause one control function to stop Thefollowing defective components could cause all control functions to be affected a Motor Pump Assembly b Main Switch Circuit and Wiring The following defective components could cause all control functions to be affected or only one control function a Relay Box b Pendant Control The component listed below would only affect one control function Solenoid When troubleshooting an electrical circuit start at the problem and work back to the power source NOTE On the battery model tables troubleshoot ing should begin by switching the operating mode For example ifa function fails when attemptingto operatethetableinthe AC120V mode switch to the BATTERY mode Ifthe function now operates the problem is prob ably located between the power cord and the relay box Ifthe function also fails when in battery operation use the auxiliary switches to operate the function If the function now operates the problem is prob ably in the pendant control connectors or wiring from the pendant control to the relay box All connector pins are numbered usually with very small numbers Page 42 6 3 Main Switch The main power supply 120 VAC 60 HZ comes inthrough the power cord and
26. pin locations a Switch Test Turn Main Power ON lock the table brakes and place the table top sections in a level position with the Kidney Lift down Disconnect connector CN2 from the relay box and using an ohmmeter test the wiring and switch operation at the appropriate pin numbers for the micro switch in question as shown in figures 5 14 through 5 21 NOTE Be sure to isolate the circuit when mak ing continuity checks NOTE If you do not receive the proper continu ity results at connector CN2 it does not necessarily mean the micro switch is defective There could be a problem with the riser cord between connector CN2 and terminal strips 1 and 2 or in the wiring from the switch to the terminal strips Further tests will have to be made to determine the exact problem TS2 4 1 1 GREY 1 t PURPLE ORANGEMHITE 5 50 04 KIDNEY INHIBIT 63 5 ORANGE BACK UP 45 INHIBIT CS 3 E83 O 9 03 BACK DOWN INHIBIT 63 2 EA CBEAGKIWHITE 1 16 LEG DOWN INHIBIT 63 1 apes SLIDE HEAD INHIBIT 63 4 4 LEG DOWN RETURN LEVEL NS 7 EE 84 16 9 OL BROWN Y N PINK 1 1 iA REDMHITE NS 6 O Hu EA CO e BACK UP RETURN TO LEVEL NS 6 NS 5 nO BACK DOWN RETURN TO LEVEL NS 5 LIGHT BLUE 5 SLIDE FOOT INHIBIT NS 5 TILT RIGHT RETU
27. protector will interrupt the power to the pump b Thermal Protector Test The Thermal Protector is built in to the pump motor andis used to interrupt the current flow to the pump motor to protect it from possible damage due to overheating 1 Turn OFF both BATTERY and AC120V operating modes 2 Use an ohmmeter to test for continuity between terminals 1 and 2 on the connector CN16 See figure 6 22 Figure 6 22 Thermal Protector 3 The Thermal Relay should reset itself after approximately one minute 4 The Thermal Relay should activate after 1 1 2 to 2 minutes of continuous pump operation c Motor Resistance Test The motor can be statically checked for resistance using anohmmeter This testis not 100 accurate because you are checking the motor with very low voltage from the meter and without any load 1 Using an ohmmeter Rx 1 scale measure the resistance between the two pins of CN15 See figure 6 22 2 The meter should read 1102 ohms atroom temperature 3 Measure the resistance between either pin and ground 4 Meter should read infinity d Test Results If you do not receive the correct meter readings the motor or wiring is defective 6 13 Return to Level Micro Switches The return to level system for the Model 3500B is the same as non battery models except for the wiring and connection to the relay box The return to level feature is activated by a single button on the pendant control and auto
28. the hydraulic cylinders reach the end of their stroke d Electro Hydraulic Mini Valve Assemblies These direct the fluid to the appropriate hydraulic cylin ders e Hydraulic Lines Fittings Connections They provide a path for the hydraulic oil f Hydraulic Cylinders They convert the hydraulic fluid pressure and volume into mechanical motion 1 2 Component Operation a Motor Pump Operation The motor pump assembly is a gear type pump that provides the oil pressure and volume for the entire hydraulic system The pump has an inlet side and an outlet side The inlet side is connected to the reservoir which provides the oil supply The reser voir has a very fine mesh screen strainer which prevents foreign material from entering the oil system The outputline of the pump is connected to the main oil galley which is internal and common to all the hydraulic mini valves and pressure relief valve Also common to the hydraulic mini valves and pressure relief valve is an oil galley that internally connects to the oil reservoir to provide a return path for the hydraulic oil See figure 1 2 MAIN RETURN OIL GALLEY INTERNAL PUMP MAIN PRESSURE OUTLET OIL GALLEY INTERNAL MOTOR PUMP PRESSURE ASSEMBLY 2 RELIEF VALVE PUMP INLET Figure 1 2 2 b Pressure Relief Valve This device provides an alternate oil path when the hydraulic cylinders reach the end of their stroke andthe pump continues to run If
29. the top back to level brings the top back to level Figure 5 15 Lateral Tilt Return Switches Page 37 When 2 is disconnected BACK DOWN function will not operate NS 5 Back Section Down Test at pins 5 amp 13 Closed 0 Open Infinity Closed 0 When the Back Section is Down NS 5 brings the Back Section Up to level and will not allow Top Slide toward foot Figure 5 16 Page 38 CN 2 De NS 6 RED WHITE PINK NS 6 Back Section Up Test at pins 6 amp 13 Table Switch Meter Position Position Reading Infinity Infinity 0 When the Back Section is Up NS 6 brings the Back Section Down to level Back Section Return Switches 7 BROWN PINK NC O COM NS 7 Leg Section Down Test at pins 7 amp 13 Table Switch Meter Position Position Reading Level Open Infinity Leg Dn Closed 0 When the Leg Section is Down NS 7 brings the Leg Section Up to level Figure 5 17 Leg Section Return Switch NOTES SLIDE function will not operate when CN 2 is disconnected eem 0 O C 13 7 PINK CN 2 NC NC COM a COM 9 5 2 5 1 CS 1 Leg Down 45 Inhibit CS 2 Back Down Inh
30. this path were not provided the pump motor would stall because the oil cannot be compressed The pressure relief valve is directly connected to the mini valve bodies and shares both the common internal main pres sure oil galley and the return oil galley that inter nally connect to the reservoir The main component of the valve is an adjustable spring loaded plunger that is pushed off from its seat by the oil pressure The oil then flows back into the reservoir Turning the adjustment nut clock wise increases the amount of oil pressure required to open the valve and turning it counterclockwise decreases the amount of oil pressure See adjust ment section for specification PRESSURE RELIEF ADJUSTMENT NUT SPRING LOADED PLUNGER Figure 1 3 Pressure Relief Valve Not Functioning PRESSURE RELIEF ADJUSTMENT NUT SPRING LOADED PLUNGER Figure 1 4 Pressure Relief Valve Functioning Mini Valves operation of the mini valves is identical for all table functions except the elevation and Single Action Brake circuits These two hydraulic circuits use a 3 way single check valve type mini valve All other functions use a 4 way dual check valve type mini valve Either type mini valve is controlled by two pushing type electrically operated solenoids The sole noids push the spool valve located in the lower portion of the valve one way or the other This motion opens the main supply
31. to the appropriate oil circuit diagram and the list of possible problems Page 13 3 3 ELEVATION DIAGNOSIS CHART Problem Reason Table will not elevate properly Pressure Relief Valve Not Set Properly Low on Oil Spool Valve Not Centered or Adjusted Properly Defective Pump Defective Mini Valve Defective Solenoid or Wiring Defective Relay Box or Pendant Control Table will not descend properly Incorrect Speed Adjustment Bad Check Valve Spool Valve Not Centered Defective Solenoid or Pendant Control Table loses elevation Bad Check Valve Leaking Mini Valve Loose Fittings Joints Hoses Leaking O Ring Inside Cylinder PRIMARY PISTON O RING SECONDARY PISTON CONES PLUMBING O RING TERMINAL CHECK VALVE P d oS b 25 CONTROL INTERNAL OIL FLEXIBLE HOSE n F ROM NL A INTERNAL OIL RETURN MINI VALVE TO RESERVOIR Figure 3 1 Elevation Circuit Page 14 3 4 TRENDELENBURG DIAGNOSIS CHART Problem Reason Trendelenburg function moves improperly Incorrect Speed Adjustment Spool Valve Not Centered or Adjusted Properly Bad Check Valves Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Defective Solenoid or Wiring Defective Relay Box or Pendant Control Trendelenburg function chatters or loses position Defective or Dirty Check Valve Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil TRENDELENBURG CYLINDER ASSEMBLY PISTON COPPER PLUMBIN
32. using an ohm meter R x 1 scale 1 Measure the resistance between the two pin connector in question as shown in figure 6 20 Connector must be disconnected Polarity of meter leads is not important 2 The meter should read approximately 16 ohms at room temperature 3 Measure the resistance between either pin and ground 4 Meter should read infinity e Test Results If the solenoid does not check out with the meter it is more than likely defective and must be replaced NOTE Whenever there are several compo nents of the same type a defective unit can also be detected by substi tuting a known good unit or wire con nector In some cases this may be faster than using a multi meter 6 12 Motor Pump Assembly The hydraulic pump motor is a 24 volt DC electric motor The oil pump unit is attached to the bottom of the motor and is a gear type displacement pump with a pumping capacity of 4 liter per min The Motor Pump Assembly is mounted on insula tors in the base of the table a Motor Pump Test 1 Disconnect motor connector CN15 Leave all other connectors connected and activate either BATTERY or AC120V operating mode 2 Activate any function and use a DC voltme ter to measure across the two pin connector Pin 1 and pin 2 See figure 6 21 Meter should read 24 28 volts Page 52 Figure 6 21 Motor Input Voltage NOTE Ifthe pump has been activated continu ously for 1 1 2to 2 minutes the thermal
33. 2 Although current at time of publication SKYTRON s policy of continuous development makes this manual subject to change without notice 03 02 TABLE OF CONTENTS cont SECTION V ELECTRICAL SYSTEM TROUBLESHOOTING cont sess 28 5 6 Motor Pump Assembly 33 5 7 Return to Level Micro Switches 35 5 8 Return Inhibit System Troubleshooting 36 SECTION VI 3500B BATTERY MODEL ELECTRICAL TROUBLESHOOTING 42 6215 2 42 6 2 Troubleshooting NOSE i Ee e Eee P ERE HL eaten cued 42 0 9 42 OA 44 6 5 Battery Charging 120 44 s ME ES TIMERE 46 6 7 ETE 47 6 8 Auxiliary SWINE S iere eet e e RR ERE MEER ERR ERAS 48 69 Polay BOK 555 E T diet 48 6 10 Main Wire Harness Continuity 50 SolenoldS odio ase Seo a IER USA te ee EO eV X YER Yee aha ed eg 51 6 12 Motor Pump Assembly
34. CN6 CN7A and CN7B from the back while attached to the relay box 3 Activate each of the Pendant Control buttons and using an AC voltmeter capable of measuring 120VAC measure the voltage between the appro priate connector pins located in connector CN6 CN7A or CN7B See figure 5 7 Polarity of meter test leads is not important Meter should read 120VAC Table Up Leg Up Table Down Leg Down Rev Trend Kidney Up Trend Kidney Down Back Up Brake Set Back Down Brake Unlock Tilt Right Flex Tilt Left Reflex Slide Head 1 2 Slide Foot 3 4 Figure 5 7 Relay Box Output Connectors CN6 and CN7 Page 31 3 f Test Results If you do not receive the correct meter readings the relay box or wiring is defective and should be replaced NOTE Before deciding the relay box is de fective check the wires and pins in the connector blocks to make sure they are not loose or making a bad connection with their mate 5 5 Solenoids The solenoids are energized by 120 volt potential that is controlled by the relays located inside the relay box The solenoid windings are protected from exces sive heat with an internal thermal fuse that will open after approximately seven 7 minutes of continu ous operation The solenoid mustbe replaced if the internal thermal fuse has been blown The sole noids are mounted directly on either side of the hydraulic mini valves and push the spool valve in one direction or the other dependi
35. Centered or Adjusted Properly Bad Check Valves Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Defective Solenoid or Wiring Defective Relay Box or Pendant Control Slide function chatters or loses position Defective or Dirty Check Valve Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil SLIDE CYLINDER ASSEMBLY PISTON PLUMBING TERMINAL COPPER CHECK LINES VALVE INTERNAL OIL RETURN TO RESERVOIR INTERNAL OIL FROM PUMP Figure 3 8 Slide Circuit Page 21 3 11 BRAKE CIRCUIT DIAGNOSIS CHART Problem Reason Brakes will not set properly Emergency Brake Release Valve Open or Defec tive Spool Valve Not Centered or Adjusted Properly NOTE Bad Check Valve If brakes have been released with the Low on Oil Pressure Relief Valve Not Set Properly Pinched Hose Defective Mini Valve Defective Relay Box or Pendant Control Emergency Brake Release Valve brakes will not reset until BRAKE UN LOCK Circuit has been activated Brakes will not stay locked Emergency Brake Release Valve Open or Defec tive Defective or Dirty Check Valve Oil Leakage in Circuit Leaking O Ring Inside Cylinder Brakes will not retract properly Incorrect Speed Adjustment Bad Check Valve Spool Valve Not Centered Defective Mini Valve Pinched Hose Defective Solenoid or Wiring Defective Relay Box or Pendant Control BRAKE CYLINDER BRAKE CYLINDER PLUMBING T
36. ERMINAL i Ss MINI VALVE PN BRAKE 2 CYLINDER 2 SPEED CONTROL ONY 7 1 RETURN 3 RESERVOIR 74 2 BRAKE RELEASE RELEASE LEVER Figure 3 9 Brake System Circuit Page 22 3 12 Flexible Hose Identification and Place ment The flexible hydraulic hoses used in the table are number coded to aid in the correct placement of the hoses from the plumbing terminal to their respec tive hydraulic cylinders Figure 3 10 shows the correct placement of the flexible hydraulic hoses and their respective number codes LEG KIDNEY e FRAME yee ee KIDNEY J RIGHT SIDE FRAME TREND 2 3 BRAKE SYSTEM ELEVATION mim mum mele EM 1 PLUMBING TERMINAL i Figure 3 10 Flexible Hoses Page 23 3 13 Kidney Lift System The Kidney Lift cylinders are connected in series so that both cylinders operate simultaneously Hydraulic pressure on one side of the lead piston causes the piston to move The piston movement forces the hydraulic fluid on the other side of the piston through the system to the other cylinder This simultaneously activates the other piston A bypass system is connected to the right cylinder assembly for initial set up and adjustment of the kidney lift system Use the following procedures to bleed or adjust
37. ET NS 2HEADUP LEVEL NS 3RIGHT UP LEVEL RL 38_ 0 RL 43 NS 4LEFT LEVEL pape to NS 5B ACK DOWN LEVEL ee RL 29 NS 6B ACK UP LEVEL PERS zm NS 7LEG DO WN LEVEL T RL 34 A D RL 31 9 f pe 1 ACKDOWN PR 4 CS 2LEGDO WN D RL 37 iet CS 3PR BACK UP CS 4LIMIT OF SLIDING TOWARD HEAD e RL 32 2 CS 5LIMIT OF KIDNEY BRIDGE UP Q eee L4 RL 26 e e 1 994 e 33 32 31 30 29 28 27 026 gsmLas DSW1 s ON TM O TM2 Q 3822 406 4 cN2 ie er NS 1 WHITE D34 RL 25 2 1 ALas P 1 BLUE 5 129 NS 2 RL 36 9 RL 44 NS 3 i YELLOW m TANE bd 4 1 LA GREEN 557 NS 4 Ppp B25 NS 5 2 A 51 26 LLL 80227 gt Dss b A pe O IE AAN xe cul E BROWN 2 RL 31 5 1 t AAR RL32 BROWN WHITE RESS 4 ant BLACK ae i 36 1 9 BLACK WHITE his Laas Re pp 8 3 xiu ep Bi tsi RL 40 Wiring Diagram Model 3500 Page 63
38. FLEX SYSTEM DIAGNOSIS CHART 18 3 8 LEGSECTION DIAGNOSIS GEART bna ret xke tte a ett HUE Ree Ren Ere guia p een Loss 19 3 9 KIDNEY LIFT DIAGNOSIS CHART 20 3 10 SLIDE DIAGNOSIS CHART m ated atin eee Ee Te ceu De eat 21 3 11 BRAKE CIRCUIT DIAGNOSIS CHART 22 3 12 Flexible Hose Identification and 23 3 13 Kidney Litt Systm cuia ee te ce up v ee tr dade ee pac poa naa e vd Dun 24 SECTION IV ELECTRICAL 26 4 1 General e ates tote t tA LT ANDE 26 42 OCOIpOHents 2 22255442 ttem ta d e tenet ede etate Des eec pe 26 43 Battery Model 26 SECTION V ELECTRICAL SYSTEM TROUBLESHOOTING sse rene nnn rennes 28 54 Troubleshooting NOES iet rnt ek dee ne ECT eet e cette eet eo qe tite ee tet 28 5521 ETYM s 28 53 deep ear ne d up Pe ne ae end 29 54 Relay in etos eee th leni 30 Te Duelo EE 3
39. G LINES bx CHECK x D 23 O RING VALVE INTERNAL OIL RETURN TO RESERVOIR INTERNAL OIL FROM PUMP Figure 3 2 Trendelenburg Circuit Page 15 3 5 LATERAL TILT DIAGNOSIS CHART Problem Reason Lateral tilt function moves improperly Incorrect Speed Adjustment Spool Valve Not Centered or Adjusted Properly Bad Check Valves Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Defective Solenoid Defective Relay Box or Pendant Control Lateral tilt function chatters or loses position Defective or Dirty Check Valves Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil LEFT TILT CYLINDER CAP FITTING PISTON O RING COPPER PLUMBING LINES TERMINAL RIGHT TILT CHECK P 4 VALVE us C SPEED CS a QS gS 2 NA Q 7 MINI VALVE 7 S INTERNAL OIL RETURN TO RESERVOIR INTERNAL OIL FROM PUMP Figure 3 3 Lateral Tilt Circuit Page 16 3 6 BACK SECTION DIAGNOSIS CHART Problem Back Section function moves improperly Back Section function chatters or loses position NOTE ONE SIDE SHOWN FOR CLARITY COPPER LINES TERMINAL Reason Incorrect Speed Adjustment Spool Valve Not Centered or Adjusted Properly Bad Check Valves Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Defective Solenoid or Wiring Defective Relay Box or Pendant Control Defective or Dirty C
40. N TAM GEAR T e O RINGS O RINGS A Figure 1 11 Kidney Lift Cylinder Assembly 4 Lateral Tilt Assembly The lateral tilt assem bly consists of two cylinders pistons and connect ing rods The connecting rods attach to the lateral tilt lever which connects to the table center column assembly The cylinder housing attaches to the table top and is attached to the center column assembly by pivots See figure 1 12 The pistons and connecting rods are attached to a non movable surface Therefore when hydraulic fluid is pumped into one side the cylinder housing itself moves around the lateral tilt lever causing the table top to tilt to one side To tilt the table top in the opposite direction fluid is pumped into the opposite cylinder O RINGS CONNECTING RODS O RINGS TILT LEVER PISTON Figure 1 12 Lateral Tilt Cylinder Assembly 5 Elevation Cylinder This single action cylin der does not have hydraulic fluid on both sides of the piston It depends on the weight of the table top assembly to lower it Page6 The cylinder is set in the center of the elevation main column The two stage cylinder is elevated by the driven force of the oil pressure When lowering the oil thatis accumulatedin the cylinderis returned to the oil reservoir through the mini valve due to the table top weight A slider support assembly is used to support the weight of the upper table section A
41. POWER ON 9 SKYTRON 9 3500 a Pendant Control Test The following test will determine ifthe micro switches inside the Pendant Control are function ing cor rectly 1 Unplug the pendant control from the base of the table You will be checking the cord side connector 2 Use an ohmmeter R x 1 scale and check the continuity between pin 1 and pins 4 through 24 See figure 5 3 3 Ohmmeter must show continuity between the pins that are indicated when the appropriate buttons are pressed COMMON POWER ON yy TABLE UP TABLE DN REV TREND TREND BACK UP BACK DOWN TILT RIGHT TILT LEFT LEG UP LEG DOWN FLEX REFLEX PENDANT CONNECTOR FRONT VIEW gt BRAKE UNLK KIDNEY UP KIDNEY DN RETURN SLIDE CTR SLIDE HEAD SLIDE FOOT lt amp e ooo 60606606 Figure 5 3 Pendant Control Test Page 29 Pins 2 and 3 are connected to the green LED power ON light on the pendant control and pin 20 is connected to the amber LED slide center light on the pendant control these pins cannot be checked with an ohmmeter b Test Results If you do not receive continuity between any of the pins either the micro switch in the Pendant Control is defective or a wire is broken Either of these problems can be repaired easily If you receive correct readings with the meter the Pendant Control is okay c Wiring Harness Test The following test checks the wire
42. RN TO LEVEL 4 GREEN TILT LEFT RETURN LEVEL NS 3 REV TREND RETURN TO LEVEL 2 YELLOW TREND RETURN TO LEVEL NS 1 wm WHITE 1 Q Figure 5 13 Return Inhibit Micro Switch Test Page 36 WHITE LIGHT BLUE BLUE NS 1 Trendelenburg NS 2 Reverse Trendelenburg Test at pins 1 amp 14 Test at pins 2 amp 14 Table Switch Meter Table Switch Meter Position Position Reading Position Position Reading Open Infinity Infinity Open Infinity 0 Closed 0 Infinity When table is in Trendelenburg Position When table is in Reverse Trendelenburg NS 1 brings the top back to level Position NS 2 brings the top back to level Figure 5 14 Trendelenburg Return Switches NS 4 NS 3 REM a 7 ERES ji 5 LIGHT BLUE 77 p ID 3 YELLOW TS 1 NS 3 Lateral Tilt Left NS 4 Lateral Tilt Right Test at pins 3 amp 14 Test at pins 4 amp 14 Table Switch Meter Table Switch Meter Position Position Reading Position Position Reading Open Infinity Open Infinity Open Infinity Closed 0 Closed 0 Open Infinity When table is inTilt Left Position NS 3 When table is in Tilt Right Position NS 4 brings
43. X CAPACITOR MOTOR PUMP ASSEMBLY DPST MAIN Bg POWER SWITCH i C 10 AMP FUSES POWER CORD 7 Figure 4 1 3500 Electrical Circuit Block Diagram Page 27 SECTION V ELECTRICAL SYSTEM TROUBLESHOOTING 5 1 Troubleshooting Notes The basic operation of each component will be defined along with a drawing and explanation on how to check it out Certain defective components could cause the entire table to stop functioning or only one control function to stop It would depend on what part of the component failed Other defective components would only cause one control function to stop The following defective components could cause all control functions to be affected a Motor Pump Assembly starting capacitor b Main Switch Circuit and Wiring The following defective components could cause all control functions to be affected or only one control function a Relay Box b Pendant Control The component listed below would only affect one control function Solenoid When troubleshooting an electrical circuit start at the problem and work back to the power source 5 2 Main Switch The main power supply 120 VAC 60 HZ comes in through the power cord and through the main switch The main switch opens both lines when in the OFF position Two 10 amp fuses are used to protect the complete electrical system and are located next to the main switch a Main Switch Test The following test will determine
44. age is obtained everything is good up to that point and the problem is more than likely the solenoid d Step 2 The solenoid can be checked out using an ohm meter R x 1 scale 1 Measure the resistance between the two pins of the connector in question See figure 5 8 Connector being tested must be disconnected Polarity of meter leads is not important 2 Themeter should read approximately 80 90 ohms atroomtemperature 58 ohms fortables S N 1997 4 amp L 3 Measure the resistance between either pin and solenoid housing 4 Meter should read infinity 3500 Test Results 5 6 Motor Pump Assembly If the solenoid does not check out with the meter The electric motor is a capacitor start type with a it is more than likely defective and must be re rating of 120 VAC 200 watts The field windings placed are protected with a thermal protector that will open the winding circuit if the motor is run continuously NOTE for approximately 10 minutes This protector will take about 10 minutes to automatically reset The Whenever there are several compo oil pump unit is attached to the bottom of the motor nents of the same type a defective unit and is a gear type displacement pump with a can also be detected by substituting a pumping capacity of 4 liter per min The Motor known good unit or wire connector In Pump Assembly is mounted onan insulated motor some cases this may be faster than plate in the base of the table The starting
45. apacitor will store a low voltage charge and most of the time this is adequate 1 Turn the main switch OFF 2 Connector CN15 should be disconnected 3 Usethe R x 100 scale of the ohmmeter and touch pins 2 and 3 of connector CN15 See figure 5 10 e Test Results The meter needle should move up scale and then back down to infinity This would indicate that the capacitor is storing an electrical charge NOTE The capacitor may have to be dis charged first by shorting pins 2 and 3 together before you will be able to see the ohmmeter needle swing upthe scale f Step 3 The motor windings can be statically checked for resistance using an ohmmeter 1 Turn main power switch OFF 2 Connector CN15 should be disconnected 3 Use the R x 1 scale of the ohmmeter and measure the resistance between the pins located in the pump connector CN15 See figure 5 11 OHM Approx 5 ohms Approx 4 ohms Approx 8 ohms Figure 5 11 Pump Connector CN15 9 Test Results If you do not receive the correct meter readings the motor or wiring is defective 5 7 Return to Level Micro Switches The return to level feature is activated by a single button on the pendant control and automatically levels the major table functions lateral tilt tren delenburg flex back section and leg section 0 The kidney lift has a back section up inhibit switch to prevent the table back section from damaging the kidney lift when the li
46. capacitor using a multi meter is mounted along side the motor pump assembly TO RELAY BOX Figure 5 8 Solenoid Test Page 33 Motor Pump Test The following tests will check the voltage applied to the motor and the resistance of the motor field windings CAUTION Line voltage will be measured in this test Do not touch uninsulated connec tor pins or meter test leads b Step 1 1 Plug the power cord into 120 VAC power supply wall receptacle Turn main switch ON 2 Disconnect the 3 pin connector CN15 at the motor Leave all other connectors connected See figure 5 9 PUMP MOTOR ASSEMBLY 1 2 CN15 CAPACITOR Figure 5 9 3 Use a voltmeter capable of measuring 120 VAC and measure the following connector pins in connector CN15 See figure 5 10 AC VOLTS 120 120 0 Figure 5 10 Connector CN15 Page 34 0 c Test Results If you do not receive the correct meter readings the problem could be in the wires connectors relay box or main switch refer to appropriate section for troubleshooting Ifthe correct voltage is obtained everything is good uptothat point and the problem could be eitherthe motor or the starting capacitor d Step 2 If the starting capacitor is shorted or grounded the motor will not run Capacitors very seldom fail and it requires a dielectric tester to accurately test one However an ohmmeter can be used to determine if the c
47. ch Adjustment MICRO SWITCH Figure 6 33 Micro Switch Adjustment Page 59 SECTION VIII ELECTRICAL SYSTEM ADJUSTMENTS 7 1 Relay Box Adjustments The Relay Box contains variable resistors for ad justing the operating timers for the BRAKE SET and BRAKE UNLOCK functions The Relay Box for the battery model tables also has variable resistors for setting the Power Off timer and the battery recharge warning circuit These timers are set at the factory and usually never need adjust ment If an adjustment is necessary remove the relay box cover and use the following procedures See figures 7 1 through 7 3 a Brake Release Timer The Brake Release Timer is set for about 7 sec onds and is controlled by the variable resistor VR1 on the relay box circuit board Turn the adjuster clockwise to increase the operating time Counter clockwise to decrease the operating time b Brake Set Timer The Brake Set Timer is setfor about 7 seconds and is controlled by the variable resistor VR2 on the relay box circuit board Turn the adjuster clock wise to increase the operating time Counterclock wise to decrease the operating time Figure 7 1 Relay Box Adjustments Model 3500 Page 60 20110100011110110011 CN 2A CN 1 UUUUUUUUUUUUUUUUUUUO UUUUUUUUUUUUUUULU Figure 7 2 Relay Box Adjustments Model 3500B Page 61
48. d 4 of CN4 for output to the pump Meter should read 120 VAC ACV all 22 3 White Black 5 Red Blue Yellow Figure 5 6 Connector CN4 b Test Results If you do not receive the correct meter readings the relay box or wiring is defective If the correct readings are obtained this part of the relay box is okay Proceed to the next step Relay Box Output Connector This test checks the low voltage applied to the pen dant control buttons 1 The power cord should be plugged into the wall receptacle and main switch turned ON 2 Disconnect Pendant Control connector All other connectors should be connected 3 Using a DC voltmeter measure the voltage between pin 1 and pins 4 through 24 of the table base connector See figure 5 4 Meter should read 5 6 volts d Test Results If you do not receive the correct meter readings the relay box or wiring is defective If the correct readings are obtained this part of the relay box is okay Proceed to the next step e Relay Box Output Connectors CN6 CN7A amp CN7B This test checks the high voltage 120V that is used to energize the solenoids CAUTION 120 VAC will be measured in this test Do not touch uninsulated connector pins or meter test leads 1 The power cord should be plugged into the wall receptacle and main switch turned ON 2 Disconnect the motor connector CN15 other connectors should be connected Test con nectors
49. ery power f Checking Output to Pendant Control Theoutputto the Pendant Control can notbe tested without specialized equipment If all tests have been conducted and it appears that the Relay Box is faulty contact SKYTRON NOTE The Relay Box connectors CN7 Pen dant Control and CN8 Auxiliary Base Connector are interchangeable 6 10 Main Wire Harness Continuity Tests If correct meter readings are not received in tests between components before replacing the compo nents test the Main Wire Harness to be sure all connectors and wires are making a good connec tion a CN4 to Batteries Test 1 Disconnect connectors CN4 and the and connectors from the batteries Leave all other connectors connected 2 Using an ohmmeter test for continuity between pin 1 of CN4 and battery connector Also test between pin 2 of CN4 and battery connector See figure 6 17 NOTE The 15 amp battery protection fuse is in the line between CN4 pin 1 and the battery connector Test the continuity ofthe fuse if correct meter reading is not received b CN4 to Pump Test 1 Disconnect connectors CN4 CN15 and CN16 Leave all other connectors connected 2 Using an ohmmeter test for continuity between the pins of CN4 and pins on CN15 and CN16 See figure 6 18 Figure 6 18 c CN4 to Charging Box Test 1 Disconnect connectors CN4 CN14 and CN51 Leave all other connectors connected 2 Using an ohmmeter tes
50. ft is raised The back section still has the capability to be lowered and raised but will not raise more than 45 above horizontal until the kidney lift is completely down If the back section is raised more than 45 above horizontal the system will not allow the kidney lift to be raised The slide function has inhibit switches to prevent damage to the back and leg sections If the back section is below horizontal the top will not slide toward the foot end If the leg section is lowered more than 45 below horizontal the top will not slide toward the head end Likewise if the top is slid toward the foot end the back section will not go below horizontal If the top is slid toward the head end the leg section will not go more than 45 below horizontal The return to level inhibit system consists of 12 micro switches an electrical connector 2 terminal strips and the related wiring The micro switches are mounted on or adjacent to the function they control and are wired for normally open or normally closed operation The micro switches are cam or lever actuated and can be adjusted at the individual switch mounting brackets See figure 5 12 NS 6 CS 3 NS 052 5 1 1 Lig TREND REV TREND TILT LEFT TILT RIGHT RELAY BOX NS 5 BACK DOWNTO LEVEL SLIDE INHIBIT NS 6 BACK UPTO LEVEL NS 7 LEG DOWN TO LEVEL CN2 2541 SLIDE LEG DOWN INHIBIT CS
51. galley which has pump pressure allowing the oil to flow through the various parts of the mini valve to the function The spool valve also opens an oil return circuit which allows the oil to return to the oil reservoir The main components of the mini valve and their functions are listed below 1 Spool Valve Opens the main oil galley pump pressure to either mini valve outlet depend ing on which direction the spool valve is pushed Also it provides a return path for the oil returning back into the reservoir 2 Pilot Plunger There are two plungers ina four way mini valve one in a 3 way mini valve one under each check valve The purpose of the pilot plungers is to mechanically open the return check valve allowing the oil to return back into the reservoir 3 Check Valve Two are provided in each four way mini valve to seal the oil in the cylinders andoil lines and preventany movement of the table One check valve is provided in a 3 way mini valve 4 Speed Adjustments There are two speed adjustments in each mini valve They are needle valve type controls which restrict the volume of oil returning back into the reservoir thereby control ling the speed of the table surface movement A 3 way mini valve has only one speed adjustment The speed controls are always located in the return oil circuit This prevents uncontrolled movement of the piston inthe slave cylinder due to one side of the piston being loaded with hydraul
52. heck Valves Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil BACK SECTION CYLINDER ASSEMBLY A 7 INTERNAL OIL RETURN TO RESERVOIR INTERNAL OIL FROM PUMP Figure 3 4 Back Section Circuit Page 17 3 7 FLEX SYSTEM DIAGNOSIS CHART Problem Back Section or Trendelenburg function moves improperly IMPORTANT If Flex System does not function prop erly check the back section and tren delenburg functions before adjusting the flex system Back Section or Trendelenburg function chatters or loses position TRENDELENBURG CYLINDER ASSEMBLY TO TRENDELENBURG MINI VALVE POPE y O RING Jk N by 24 S PISTON Reason Incorrect Speed Adjustment Trendelenburg Back Section or Flex check with gauge Spool Valve Not Centered or Adjusted Properly Bad Check Valves Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Defective Solenoid or Wiring Defective Relay Box or Pendant Control Defective or Dirty Check Valves Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil BACK SECTION CYLINDER ASSEMBLY DOWNCIRCUIT 7 PLUMBING TERMINAL TO BACK SECTION MINI VALVE VALVE SPEED CONTROL S MINCVAEYE INTERNAL OIL RETURN TO RESERVOIR INTERNAL OIL FROM PUMP Figure 3 5 Flex System Circuit Page 18 3 8 LEG SECTION DIAGNOSIS CHART Problem Reason Leg function moves i
53. ibit Test at pins 9 amp 13 Test at pins 10 amp 13 Table Switch Meter Table Switch Meter Position Position Reading Position Position Reading Closed 0 Open Infinity i Closed 0 0 Open Infinity Open Infinity When Top is slid toward head CS 1 will When Top is slid toward foot CS 2 will not allow Leg Section to go more than not allow Back Section to go below 45 below horizontal horizontal Figure 5 18 Leg Down Back Down Inhibit Switches CS 3 Back Up Inhibit Switch Test at pins 11 amp 13 Table Switch Meter Position Position Reading Open Infinity Closed 0 When K Lift is Up CS 3 will not allow Back Section to go more than 45 above horizontal Figure 5 19 Back Up Inhibit Switch Page 39 5 4 BROWN WHITE NC ea PINK 6 3 O COM d o 2 2 CS 4 Slide Inhibit Test at pins 8 amp 13 Table Switch Meter Position Position Reading Level Open Infinity Leg Dn Closed 0 more than 45 When Leg Section is more than 45 below horizontal CS 4 will not allow Top to Slide toward head Figure 5 20 Slide to Head Inhibit Switch 5 ORANGE WHITE 42 3 13 T o 2 2 CS 5 Slide Inhibit Test at pins 12 amp 13 Switch Meter Position Reading Back Up Less Than 45 Ope
54. ic pressure and the other side having no load Also by using this control method it doesn t matter what size cylinder and piston is used because the speed can be controlled by restricting the return oil If the pump puts out more volume to a certain slave cylinder than the speed control is allowing to go back to the reservoir the pressure relief valve provides an alternate path for the pump oil d Mini Valve in Neutral Position No fluid flow See figure 1 5 1 Spool Valve Centered This closes off both oil pressure and oil return galleys 2 Pilot Plungers Both Closed The pilot plung ers control the opening of the check valves If they are closed the check valves must be closed 3 Check Valves Both check valves are closed trapping the oil in the cylinder and oil lines 4 Speed Adjustment When the mini valve is in the neutral position the speed adjustment does not affect anything because there is not any oil flow OIL LINE OIL LINE SPEED CONTROL 5 PILOT PLUNGER CHECK VALVE V OILGALLERY OILRETURN SPOOL SOLENOID PRESSURE RETURN VALVE Figure 1 5 Mini Valve in Neutral Position Page 3 Mini Valve Right Port Activated See figure 1 6 Slave Cylinder Piston Moves to Left Right Mini Valve Port is Supply Line Left Mini Valve Port is Return Line Figure 1 6 Mini Va
55. if line voltage is applied to connector CN4 which in turn would power the table 1 Plug the power cord into the 120VAC power supply wall receptacle and turn ON the main switch Page 28 2 Disconnect connector CN4 from the relay box See figure 5 1 Leave all other connectors connected 9 CN4 RELAY BOX Figure 5 1 Main Power Test CAUTION Line voltage 120 VAC will be mea sured in this test Do not touch uninsu lated connector pins or meter test leads 3 Use an AC voltmeter capable of measuring 120 VAC and measure the voltage between pins 1 and 2 black and white wires located in connec tor CN4 See figure 5 2 You should receive line voltage 120 VAC Yellow Figure 5 2 Connector CN4 b Test Results If you do not receive the correct voltage measure ment the problem would have to be in the wires main switch fuses or power cord If the correct voltage is obtained everything is good up to this point and the problem would have to be in another area 5 3 Pendant Control The Pendant Control consists of 18 micro switches buttons When any of the circuits are completed by depressing a control button the appropriate relay contacts located in the relay box close applying 120V potential to the appropriate solenoid to operate the mini valve andthe pump motor The Pendant Control has only 5 6 volts applied to it os PRESS TO LOCK BRAKES 01 8 SLIDE CTR
56. ims TCA4514BP 9 w 19 eu BRAKE 54 028 E F 1 5 2 2 M ZNR31 ZNR32 ZNR33 ZNRM RL 18 CN2B RN3 19 19 1 IC3 1010 1 E 1 18 k gt CN10 5 A0 31 Pts 2 1 mer rn p gt 2 10 Vpp 9 Vee 21 4 BS cu 5 rol sw lt M 0 7 ZNR19 Tas m 7 re RL 22 SET cn 8 4 E 225 22 2 Lock mE ZNR2O EM 0317 27 18 7 tHe swa qim ze IP 6 Za E tI 25 21 7 07 m A 98 12 9 lt ne 2 30 TT sm 8 A13 NC L lt 29 a n e FELT 3 25 25 523 Q 9 2145 fie 2 lt nte gt 4 ZNR2S LN pot sws HN27C101AG 10 Be 2 l 1 nus H T 15 bud aur zB Nm 7 TH owe 41 T 4 d 13 lt 28 28 3 nes 4 3 12242 VS2 CN3 BV R27 LE I 29 29 5V sv t D29 lt 622 t t T 77 2 30 30 GND TM TM2 Q 4 E car So Rat R22 R24 2 1 T NS 1HEAD lt lt T 13 1 lt lt DOWN J lal RL 28 4 LEVEL i 21 NS 2HEAD UP 1 B LEVEL uM MEME IMg S NS 3RIGHT UP og LEVEL z l 6 12 BAT2 1 vv rO 9 1 9 04 CS 1B ACK DOWN MP 9o 15A UL PROHIBIT
57. ins 7 amp 15 E E Switch Meter Position Reading Level Open Leg When the Leg Section is Down NS 7 brings the Leg Section Up to level Figure 6 28 Leg Section Return Switches Page 56 CS 1 Leg Down 45 Inhibit Test at pins 9 8 15 Table Switch Meter Position Position Reading 0 0 Closed Closed Open Infinity When Top is slid toward head CS 1 will not allow Leg Section to go more than 45 below horizontal NOTES SLIDE function will not operate when CN 10 is disconnected BLACK 3 9 EL D H 4 BLACK WHITE 5 PURPLE m om CS 2 CS 1 CS 2 Back Down Inhibit Test at pins 10 amp 15 Switch Meter Position Reading Open Infinity Closed 0 Open Infinity Table Position When Top is slid toward foot CS 2 will not allow Back Section to go below horizontal Figure 6 29 Leg Down Back Down Inhibit Switches ORANGE NC TS 2 CN 10 CS 3 Back Up Inhibit Switch Test at pins 11 8 15 Table Switch Meter Position Position Reading Open Infinity Closed 0 When K Lift is Up CS 3 will not allow Back Section to go more than 45 above horizontal Figure 6 30 Back Up Inhibit Switches Page 57 254 2 f L2 BROWNWHITE NC O M GREY d TS
58. lay box is activated when any function on the pendant control is pushed momentarily The pump motor and brake system mini valve is activated and the brake cylin ders are completely set The electronic timer runs for approx 8 10 seconds The brakes are released by pushing the BRAKE UNLOCK button momentarily An electronic timer in the relay box activates the brake function hy draulic mini valve and pump motor Page 7 When activated the return hydraulic circuit oper ates similar to the elevation cylinder return circuit Return springs inside the single action brake cylin ders retract the brake pads and provide the pres sure to return the hydraulic oil back to the reservoir The electronic timer operates the return circuit for approximately 8 10 seconds Emergency Brake Release The emergency brake release is simply a manually operated bypass valve connected in parallel to the brake cylinders and the oil reservoir See figure 1 17 When the valve is opened turned counter clockwise a return circuit for the brake hydraulic fluid is opened The return springs force the pistons up pushing the hydraulic oil back into the reservoir and retracting the brake pads EMERGENCY BRAKE RELEASE LEVER Figure 1 17 IMPORTANT The emergency brake release valve must be tightened securely when not in use elf the emergency brake release valve has been operated the UNLOCK but ton on the pendant control may have to be pressed
59. lve Right Port Activated 1 Spool Valve Pushed to the left by electric solenoid This opens the internal oil pressure gal ley allowing the fluid to go through the check valve and on to the cylinder Also the spool valve opens the oil return line providing an oil path through the internal oil galley back to the reservoir 2 Pilot Plunger Valve Left pilot plunger valve is pushed up by the incoming oil pressure mechani cally opening the check valve located above it in the return circuit This action allows the oil from the left side of the slave cylinder to go back into the reservoir The right pilot plunger valve is not affected in this operation mode 3 Check Valves Both check valves are opened in this operation mode The right check valve is pushed open by the oil pressure created by the pump The oil then continues to go through the lines and pushes the slave cylinder piston to the left At the same time the left check valve is held open mechanically by the pilot plunger providing a return path for the oil through the mini valve back to the reservoir 4 Speed Adjustment The right speed control output side does not have any effect in this operation mode because the oil is routed around the speed adjustment through a by pass valve and then to the output port The left speed adjustment controls the speed of the table function by restrict ing the amount of oil going back into the reservoir Page4 f Mini Valve Left Po
60. matically levels the major table functions lateral tilt tren delenburg flex back section and leg section The kidney lift has a back section up inhibit switch to prevent the table back section from damaging the kidney lift when the lift is raised The back section still has the capability to be lowered and raised but will not raise more than 45 above horizontal until the kidney lift is completely down If the back section is raised more than 45 above horizontal the system will not allow the kidney lift to be raised ns 6 NS 7 CS2 A r 1r 1 RELAY BOX a 35008 The slide function has inhibit switches to prevent damage to the back and leg sections If the back section is below horizontal the top will not slide toward the foot end If the leg section is lowered more than 45 below horizontal the top will not slide toward the head end Likewise if the top is slid toward the foot end the back section will not go below horizontal If the top is slid toward the head end the leg section will not go more than 45 below horizontal The return to level inhibit system consists of 12 micro switches an electrical connector 2 terminal strips and the related wiring The micro switches are mounted on or adjacent to the function they control and are wired for normally open or normally closed operation The micro switches are cam or lever actuated and can
61. mproperly Incorrect Speed Adjustment Spool Valve Not Centered or Adjusted Properly Bad Check Valves Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Defective Solenoid or Wiring Defective Relay Box or Pendant Control Leg function chatters or loses position Defective or Dirty Check Valves Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil LEG SECTION CYLINDER ASSEMBLY NOTE ONE SIDE SHOWN FOR CLARITY DOWN CIRCUIT LINES TERMINAL 22 PLUMBING 252 p TJ a INTERNAL OIL RETURN TO RESERVOIR INTERNAL OIL FROM PUMP Figure 3 6 Leg Section Circuit Page 19 3 9 KIDNEY LIFT DIAGNOSIS CHART Problem Reason Kidney Lift moves improperly Incorrect Speed Adjustment Spool Valve Not Centered or Adjusted Properly Bad Check Valve Low on Oil Pinched Hose Defective Mini Valve Pressure Relief Valve Not Set Properly Defective Solenoid or Wiring Defective Relay Box or Pendant Control Kidney Lift chatters or loses position Defective or Dirty Check Valve Oil Leakage in Circuit Air Inside Cylinder Pinched Hose Low on Oil Lift Rods Binding KIDNEY LIFT CYLINER ASSEMBLY COPPER PLUMBING 7 LINES TERMINAL d P dint INTERNAL OIL RETURN TO RESERVOIR INTERNAL OIL FROM PUMP Figure 3 7 Kidney Lift Circuit Page 20 3 10 SLIDE DIAGNOSIS CHART Problem Reason Slide function moves improperly Incorrect Speed Adjustment Spool Valve Not
62. ms for the back section a Back Section Position the back section all the way up until it stalls Both sides of the back section should stop moving at the same time and should not show any signs of twisting Any twisting or flexing of the back section as it approaches the stalled position indicates that one of the cylinders is not reaching its fully extended position at the same time as the other This condition would require an adjustment To adjust Remove the top from the seat section for access to the locking set screws Loosen the set screw located above the eccentric cam in each side frame Use an allen wrench to turn the cylinder eccentric cams as required to shift either cylinder fore or aft as needed so no twisting or flexing of the back section is observed when it is stalled in the full up position Tightenthe set screws and replace the seat section top when proper adjustment has been achieved See figure 2 2 BACK SECTION a SEAT SECTION TOP BACK SECTION CYLINDER ECCENTRIC CAM Figure 2 2 Back Section Adjustment b Leg Section Position the leg section all the way up until it is horizontal Both sides of the leg section should stop moving at the same time and should not show any signs of twisting Any twisting or flexing of the leg section as it approaches the stalled position indicates that one of the cylinders is not reaching its fully extended position at the same time as the other and an
63. n Infinity Back Up More Than 45 Closed 0 When Back Section is more than 45 above hori zontal CS 5 will not allow Kidney Lift to operate Figure 5 21 Kidney Lift Inhibit Switch Page 40 b Switch Adjustment If proper readings are not obtained during test or if table does not properly return to level use the following procedure to adjust the switches 1 Apply table brakes and using a level level the table top using the TRENDELENBURG and LATERAL TILT function buttons on the pendant control 2 For all switches except the Leg Section switches carefully loosen the switch retaining screws and adjust the switches as needed See figure 5 22 RETAINING SCREWS MICRO SWITCH Figure 5 22 Micro Switch Adjustment 3 To adjust the Leg Section switches remove seat section top loosen the two Phillips head screws securing the bracket adjust the switch tighten screws and replace seat section top See figure 5 23 PHILLIPS HEAD SCREWS Figure 5 23 Leg Section Micro Switch Adjustment Page 41 35008 SECTION VI 3500B BATTERY MODEL ELECTRICAL TROUBLESHOOTING 6 1 General The battery table components operate on 24VDC The internal charging system also incorporates the components to transform the 120VAC input to 24VDC output to the components 6 2 Troubleshooting Notes The basic operation of each component will be defined along with a drawing and explanation on how to check it
64. nction is activated by pressing any function button except BRAKE UNLOCK A timer in the Re lay Box allows continuous output for about 7 seconds f the brakes are already locked no output is provided The BRAKE UNLOCK button activates another timer in the relay box which allows continuous output for the brake release function for approximately 7 seconds If the brakes are already released using the BRAKE UNLOCK button no output is provided 2 Test connectors CN1 CN2A and CN2B from the back while attached to the relay box All connectors should be connected 3 Activate each ofthe pendant control buttons and measurethe output voltage forthe correspond ing connector pins with a DC voltmeter See figure 6 16 Meter should read 24 volts Table Up Back Up Table Down Back Down Trend Slide Foot Rev Trend Slide Head Tilt Right Kidney Up Tilt Left Kidney Down Reflex Leg Up Flex Leg Down Brake Set 1 2 Brake Unlock 3 4 Figure 6 16 Solenoid Output Connectors Page 49 35008 Test Results If you do not receive the correct meter readings the relay box is defective and should be replaced NOTE Before deciding the relay box is de fective check the wires and pins in the connector blocks to make sure they are notloose or making a bad connec tion with their mate elf the battery power is ON and no table functions have been activated for 3 hours the power off circuit will interrupt the batt
65. nd using an ohmmeter test the continuity between the corresponding pins in connectors CN7 and the base connector See figure 6 12 OHM 1 1 2 2 3 3040 95 4 67 7 CN7 CONNECTOR Figure 6 12 Base Connector Continuity Test If the correct readings are obtained this part of the circuit is okay and the problem may be Pendant Control or the Relay Box Contact SKYTRON if all tests performed indicate that the problem is located in the Pendant Control Page 47 35008 6 8 Auxiliary Switches The following tests will determine if the auxiliary switches are functioning properly a Switch Test Disconnect connector CN3 at the Relay Box and using an ohmmeter check for continuity at the connector pins pin 1A common while activating the appropriate switch See figure 6 13 Meter should read 0 ohms b Test Results If proper meter readings are not received test the individual switches as necessary Using an ohm meter test the operation of an individual switch with the test lead at the center terminal of the switch and the test lead at the terminal opposite the direction of the switch actuation See figure 6 14 Meter should read 0 ohms If the switches check out the problem would have to be in the wires or connector CN3 SW1 D TABLE UP 2 TABLE DOWN sw2 HEAD DOWN 8 RIGHT DOWN 9 9 LEFT DOWN sw3
66. ng pump pressure opens the pressure relief valve which provides a return oil path to the reservoir The mini valve used in the elevation circuit con tains only one check valve all four way mini valves use two check valves The check valve is used to trap the oil in the elevation cylinder thereby supporting the table top When the top is being lowered the check valve is mechanically held open by the pilot plunger through pump pressure ELEVATION CYLINDER CHECK SPEED VALVE CONTROL PLUNGER SPOOL VALVE PRESSURE x RELIEF VALVE g RESERVOIR Figure 1 15 Elevation Return Circuit i Brake System The brake system consists of the following compo nents figure 1 16 1 Single action slave cylinders 4 each 2 3 way single check valve type mini valve 3 Manually controlled emergency brake re lease 4 Plumbing terminal flexible hoses copper lines and O rings 5 Portions of the electrical system BRAKE CYLINDERS MINI VALVE EMERGENCY BRAKE RELEASE PRESSURE RELIEF VALVE Figure 1 16 Brake System Block Diagram Each corner of the cast iron table base has a hydraulic brake cylinder These single action cyl inders are hydraulically connected in parallel to the mini valve and all four are activated together It is normal for one corner of the table to raise before the others due to the weight distribution of the table An electronic timer in the re
67. ng upon which solenoid is activated a Solenoid Test Thefollowing tests check the voltage applied to the solenoids and the resistance of the solenoid coil NOTE solenoid does not function when the pendant control button is pushed the problem could be the pendant control the relay box or the solenoid NOTE Each solenoid is controlled with 120V source coming from the relay box This source can easily be checked by mea suring the voltage atthe 2 pin connector in question CAUTION Line voltage will be measured in this test Do nottouch uninsulated connec tor pins or meter test leads Page 32 b Step 1 1 Plug the table cord into the wall receptacle and turn main switch ON 2 Disconnect the 2 pin connector from the solenoid in question See figure 5 8 3 Use a voltmeter capable of measuring 120 VAC and measure the voltage across the 2 pin connector Polarity of meter leads is not important NOTE The appropriate pendant control but ton must be pushed during this test The motor will run when this test is performed and the brake locking sole noid will be activated by any function other than UNLOCK if brakes are not set c Test Results If you do not receive the correct voltage the prob lem could be in the wires leading to connectors CN6 CN7A and CN7B The problem could also be in the relay box or the Pendant Control refer to appropriate section for troubleshooting Ifthe correct volt
68. oubleshooting a table malfunction first determine the following 1 Does the problem affect all control func tions 2 Does the problem affect only one control function 3 Ifthe problem affects one control function is it in both directions 4 15 the problem intermittent 5 Is the problem no movement of a table surface or does the table surface lose posi tion Once the problem has been determined concen trate on that particular hydraulic circuit or control function Listed below are the hydraulic components that are common with all hydraulic circuits If there is problem with any of them it could affect all control functions 1 Motor Pump Assembly 2 Reservoir 3 Pressure Relief Valve 4 Certain Oil Lines and Galleys If there was a problem in the following components only one control function would normally be af fected 1 Mini Valve 2 Slave Cylinder 3 Oil Lines NOTE Whenever a hydraulic line or compo nent is replaced bleed the air out of the lines using the pump pressure before making the final connection After all connections are tight cycle the control function back and forth two or three times to purge the remaining air from the system IMPORTANT When installing new O rings use hy draulic oil to thoroughly lubricate the O rings and cylinder Keep everything clean Each complete oil circuit is shown on the following pages Whentroubleshooting a particular function refer
69. perating mode of the table For example if afunctionfails when attempting to operate the table in the AC120V mode switch to the BAT TERY mode the function now operates the problem is not the pendant control and probably is a problem located between the power cord and the relay box If the function also fails when in battery operation use the auxiliary switches to operate the function If the function now operates the problem is probably in the pendant control connectors or wiring from the pendant control to the relay box a Pendant Control Test There are no servicable components within the Pen dant Control The cord is detachable and can be tested for continuity between the pins on the connec tors Use the following procedure to test the pendant control cord Disconnect the cord from the base connector and from the pendant control connector and using an ohmmeter test the continuity between the corre sponding pins in the connectors See figure 6 11 H RED 1 2 BROWN 4 d 4 ORANGE B BLUE 3 5 BLACK F 4 WHITE 6 7 GREEN D Test Leads Pend Conn Base Conn Base Conn Pend Conn Figure 6 11 Pendant Control Cord Test b Test Results If you do not receive the correct readings the wiring or connector pins may be faulty c Base Connector Test If correctreadings are received testthe wiring from the base connector to connector CN7 at the Relay Box Disconnect connector CN7 from the Relay Box a
70. ral tilt frame covers for access to the top rollers 1 Align the table top so the rollers to be adjusted are contacting the slide bars 2 Loosen the adjustment cam set screw and adjust the roller using an 8mm Allen wrench See figure 2 5 To avoid any possible bindingin the slide mechanism adjustthe roller on the opposite side of the table in the same manner cam turned toward same end of table on each side 3 Adjust rollers so top slides smoothly with no up or down movement of the table top 4 When adjustment is complete tighten set screws replace covers and top section SET SCREW 8mm ALLEN WRENCH Figure 2 5 SECTION HYDRAULIC TROUBLESHOOTING 3 1 Precautions Before attempting to troubleshoot any hydraulic problem on the table please read through the pre cautions and notes below CAUTION When disconnecting any of the hydrau lic lines fittings joints hoses etc for the following control functions be sure these table surfaces are in their down position or completely supported Elevation Back Section Leg Section Kidney Lift When working on the trendelenburg or lateral tilt hydraulic circuits be sure to support the table top When working on the brake system make sure the brakes are completely retracted CAUTION Failure to follow these precautions may result in an uncontrolled oil spray and damage to the table or personal injury 3 2 Troubleshooting Notes When tr
71. reby controlling the speed of each control function All four way mini valves have two speed controls located in the ends of each valve body All three way mini valves have only one speed control Page 9 One speed control adjusts one direction of a particular function and the opposite speed control adjusts the other direction They are adjustable by using a small straight blade screwdriver and turning the adjustment screw clockwise to de crease the speed and counterclockwise to increase the speed Refer to figure 1 21 TABLE DOWN TILT RIGHT TREND REFLEX BRAKE BACK UP LEG DOWN KIDNEY UP TILT LEFT FLEX KIDNEY BACK DOWN DOWN LEG UP Figure 1 21 Any control function should move in either direc tion atthe same rate If the rate of acertain function is too slow open the speed control slightly and recheck Use the secondhand ona watch and time a particular function Match that time in the opposite direction by opening or closing the speed control Approximate operating times are as follows Elevation Down 30 seconds Lateral Tilt 7 seconds Leg Up 25 seconds Leg Down 15 seconds Kidney Lift 7 seconds Slide 20 seconds Page 10 A pressure gauge should be used to set the speed of the back section trendelenburg and flex control functions To adjust 1 Attach the pressure gauge onto the main oil galley as shown in figure 1 20 2 The gauge should read the following values when operating the various con
72. rt Activated See figure 1 7 Slave Cylinder Piston Moves to Right Left Mini Valve Port is Supply Line Right Mini Valve Port is Return Line Figure 1 7 Mini Valve Left Port Activated 1 Spool Valve Pushed to the right by electric solenoid This opensthe internaloil pressure galley allowing the fluid to go through the check valve and on to the cylinder Also the spool valve opens the oil return line providing an oil path through the internal oil galley back to the reservoir 2 Pilot Plunger Valve Right pilot plunger valve is pushedup by the incoming oil pressure mechani cally opening the check valve located above it in the return circuit This action allows the oil from the right side of the slave cylinder to go back into the reservoir The leftpilot plunger valve is not affected in this operation mode 3 Check Valves Both check valves are opened in this operation mode The left valve is pushed open by the oil pressure created by the pump The oil then continues to go through the lines and pushes the slave cylinder piston to the right Atthe same time the right check valveis held open mechanically by the pilot plunger providing a return path forthe oil through the mini valve backto the reservoir 4 Speed Adjustment The left speed control output side does not have any effect in this oper ation mode because the oil is routed around the speed adjustment through a by pass valve and then to the output port
73. s 4 2 2 o BROWN BON PINK 1 1 RED WHITE NS 6 Lq RED i RED BACK UP RETURN TO LEVEL NS 6 NS 5 IN BACK DOWN RETURN TO LEVEL NS 5 LIGHT BLUE SLIDE FOOT INHIBIT NS 5 TILT RIGHT RETURN TO LEVEL NS 4 NSA 8 GREEN TILT LEFT RETURN TO LEVEL NS 3 o gt wi REV TREND RETURN TO LEVEL NS 2 YELLOW TREND RETURN TO LEVEL NS 1 Ned 2222 BLUE amp 2 1 48 WHITE Page 54 o Figure 6 24 Return Inhibit Micro Switch Test WHITE NC o LIGHT BLUE S COM BLUE 2 NS 2 NC O NS 1 Trendelenburg NS 2 Reverse Trendelenburg Test at pins 1 amp 15 Test at pins 2 amp 15 Table Switch Meter Table Switch Meter Position Position Reading Position Position Reading Open Infinity Open Infinity Open Infinity Closed 0 Closed 0 Open Infinity When table is in Trendelenburg Position When table is in Reverse Trendelenburg NS 1 brings the top back to level Position NS 2 brings the top back to level Figure 6 25 Trendelenburg Return Switches NS 4 NS 3 ERR 9 ch GREEN ZEN NO c 5 LIGHT BLUE COM F 3 1 4 YELLOW 1
74. s leading from the relay box connector 8 to the 24 connec tor table socket These wires apply low voltage to the pendant control buttons 1 The power cord should be plugged into the wall socket and the main switch turned ON 2 Disconnect the pendant control from the base connector All other connectors should be connected 3 Use a DC voltmeter 10V scale and measure the following pins located in the 24 pin table base connector See figure 5 4 NOTE Pin 19in table base connector will have no voltage potential unless 1 of the return to level micro switches are acti vated i e trendelenburg tilt etc 1 2 3 21 22 0 1 4 20 23 24 5 6 Figure 5 4 Table Base Connector Page 30 3 5 0 d Test Results If you do not receive the correct voltage reading the wiring or connector pins may be faulty Discon nect connector CN8 from the relay box and using an ohmmeter test the continuity between the cor responding pins in connectors CN8 and the table base connector See figure 5 5 If the correct readings are obtained this part of the circuit is okay BASE CONNECTOR BASE CONN COLOR N8 A1 B1 Red White White Black Red White Red Yellow Brown White Brown Blue Whte Orange White Orange Gray White Gray White Yellow Purple White Black White Purple White Purple Blue Yellow Blue Red Blue White Blue Figure 5 5 Base Connector Continuity Te
75. ser cord from terminal strips 1 and 2 to connector CN10 The terminal strips are located under the hose cover on the top of the elevation column Connector CN10 plugs into the relay box andis the most convenient location to make circuit continuity checks See fig 6 24 for connector pin locations a Switch Test Turn Main Power ON lock the table brakes and place the table top sections in a level position with the Kidney Lift down Disconnect connector CN10 from the relay box and using an ohmmeter test the wiring and switch operation at the appropriate pin numbers for the micro switch in question as shown in figures 6 25 through 6 32 NOTE Be sure to isolate the circuit when mak ing continuity checks NOTE If you do not receive the proper continu ity results at connector CN10 it does not necessarily mean the micro switch is defective There could be a problem with the riser cord between connector CN10 and terminal strips 1 and 2 or in the wiring from the switch to the terminal strips Further tests will have to be made to determine the exact problem GREY 9 PURPLE CS 50 ORANGE WHITE KIDNEY LIFT INHIBIT CS 5 C93 0 8 ORANGE BACK UP 45 INHIBIT CS 3 Ime BACK DOWN INHIBIT 5 2 20 2 BLACK WHITE LEG DOWN INHIBIT CS 1 MIS OBE AK SLIDE HEAD INHIBIT CS 4 CS 10 LGH LEG DOWN RETURN LEVEL NS 7 BROWN WHITE c
76. st 5 4 Relay Box The 120 volt power supply is directly connected to the relay contacts When these contacts are closed 120 volts is supplied to the solenoids which are mounted on the hydraulic mini valves One relay is used to supply 120V to the pump motor and is always activated no matter what control function is selected The brake locking circuit relay is also activated when any control function other than BRAKE UNLOCK is initially selected Also inside the relay box is a step down trans former and full wave rectifier which decreases the line voltage to 5 5 volts This low voltage potential controls the relays by the use of the hand held pendant control buttons Basically the relays en able a 5 5 volt potential to control the 120 volt circuit The following tests will determine if the relay box is functioning correctly a Relay Box Input Connector CN4 1 Plug the power cord into the 120 VAC power supply wall receptacle and turn the main switch ON Leave all connectors connected CAUTION Line voltage 120 VAC will be mea sured in this test Do not touch uninsu lated connector pins or meter testleads 2 Use an AC voltmeter capable of measuring 120 volts and measure the voltage between pins 1 white and 2 black of connector CN4 for input voltage See figure 5 6 Meter should read line voltage 120 VAC 3 Activate any table function with the Pendant Control and using an AC voltmeter test the voltage at pins 3 an
77. stainless steel shroud covers the flexible hydraulic hoses and slider See figure 1 13 ELEVATION CYLINDER r1 SHROUD 47 PRIMARY AQ 11 77 PISTON ELEVATION COLUMN za SECONDARY 2 2 PISTON Figure 1 13 Elevation Cylinder Assembly 6 Brake Cylinders The brake cylinders are single action type similar to the elevation cylinder The movable piston s ram is connected to a brake pad See figure 1 14 Oil pumped into the top of the cylinder pushes the piston down raising the table base off its casters An internal return spring on the bottom of the piston pushes the piston up to return the oil through the mini valve to the reservoir 722277 i 24 _ 22 H PISTON OIL LINE RETURN SPRING PD E RAM Figure 1 14 Brake Cylinder h Elevation Cylinder Return Circuit A three way single check valve type mini valve controls both the elevation and return circuits The elevation circuit operation within the mini valve is identical to the operation of the four way valves previously described inlet pressure opens the check valve allowing the oil to enter the cylinder In the return position inlet pressure pushes the pilot plunger up and opens the return check valve See figure 1 15 The open check valve allows apath for the oil in the elevation cylinder to return to the reservoir When the pilot plunger valve is opened the continui
78. t for continuity between pins 4 5 and 6 of CN4 pins 1 and 2 of CN14 and pin 4 of CN51 See figure 6 19 CN51 CN 4 CN 51 OHMS Figure 6 19 CN4 CN14 and CN51 6 11 Solenoids The solenoids are energized by 24 volt potential that is controlled by the relay box The solenoid windings are protected from exces sive heat by an internal thermal fuse that will open after approx 7 minutes of continuous operation The solenoid must be replaced if the internal ther mal fuse has been blown The solenoids are mounted directly on either side of the hydraulic mini valves and push the spool valve one direction or the other depending upon which solenoid is activated a Solenoid Test The following tests will check the voltage applied to the solenoids and the resistance of the solenoid coil b Test 1 1 Activate either BATTERY or AC120V oper ating mode 2 Disconnect the 2 pin connector from the solenoid in question all other connectors should be connected See figure 6 20 OHM BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BACK SECT LAT LEG TABLE TREND FLEX SECT KIDNEY SLIDING BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE BLUE WHITE BLUE
79. t should be replaced 6 5 Battery Charging Box AC120V Transformer The Battery Charging Box contains the battery charging system as well as the components for AC120V operation except the transformer a Transformer Test 1 Confirm 120VAC input at CN12 using Main Switch test in 6 3a 2 Connect CN12 disconnect CN13 brown and red wires and using an AC voltmeter test the transformer output at CN13 See figure 6 5 3 Meter should read 22VAC 35008 Figure 6 5 Connector CN13 Test b Test Results If the correct voltage is obtained everything is good up to this point and the problem would have to be in another area If you do not receive the correct measurements the problem may be in the wires connectors or transformer The transformer is located in the rear of the base under the stainless steel base cover The stainless steel cover will have to be discon nected and lifted from the base for access to the transformer for further testing c Battery Charging Box Test 1 Make sure all connectors are connected and turn AC120V operation ON Using a DC voltmeter test pin 3 and pin 4 of CN51 DO NOT disconnect connector CN51 See figure 6 6 5 RED WHITE 6 BLUE WHITE BLACK 4 2 BROWN 1 BROWN Figure 6 6 Connector CN51 2 Meter should read 26 5 1VDC 3 Test pin 5 and pin 6 of CN51 with DC voltmeter to test operation of CHARGING indicator light next to power cord
80. tected The main power on off switch is an enclosed DPST type and the power cordis a three wire fifteen foot long UL listed cord with a three prong hospital grade plug Page 26 4 2 Components Refer to figure 4 1 for the relationship of the elec trical components a Wires Connectors Switches Fuse These provide the path for the various electrical circuits b Relay Box Contains the step down trans former full wave rectifier and relay switches The relay switches are activated by the pendant control and in turn energize the solenoid c Hand Held Pendant Control Closes micro switches to activate relay box Operates on 5 VDC d Solenoids These electrically open and close the hydraulic ports of the mini valve to direct the fluid to the correct cylinders They operate on 120 VAC e Motor Pump Assembly 120 VAC 60 HZ 200 Watt capacitor induction motor 4 3 Battery Model Components The functions of the battery model tables are the same as the standard 120 VAC models The electrical components and operation however vary greatly between the two models To simplify the troubleshooting procedures the battery model tables are covered separately in Section VI 3500 2 PIN SOLENOIDS CONNECTOR PENDANT CONTROL MINI VALVES AUXILIARY BASE CONNECTOR TM BASE SA 9 CONNECTOR TO RETURN CIRCUIT MICRO SWITCHES 111 CN7B CN7A TERMINAL STRIPS 1 amp 2 CN2 RELAY BO
81. the system if needed a Bleeding the System If the hydraulic lines or cylinders have been disconnected from the kidney lift system for any reason use the following proce dure to bleed the air from the system 1 Remove the kidney lift top section and begin the procedure with both pistons in the down posi tion chambers A amp C as shown in figure 3 11 2 Make sure the bypass valve is closed valve screw tight and activate KIDNEY DOWN The hydraulic fluid will fill cavity D as shown in figure 3 11 LEFT B CYLINDER A BYPASS VALVE 7777777777 ZZ RIGHT CYLINDER Figure 3 11 3 Open the bypass valve by loosening the screw in the bottom of the valve and activate KIDNEY UP Hydraulic fluid fills cavity A and pushes the piston into cavity B The open valve allows a path for air to escape from cavity B without affecting the piston in C See figure 3 12 4 Leave the bypass valve open and activate KIDNEY DOWN Hydraulic pressure keeps the piston in chamber C the hydraulic fluid passes through the bypass valve and fills cavity B push ing the piston into cavity A See figure 3 13 Page 24 LEFT B CYLINDER A Sa Figure 3 12 LEFT B CYLINDER A CYLINDER Figure 3 13 5 Repeat steps 3 and 4 as needed to remove any remaining air in the system 6 With both pistons in the full down position activate KIDNEY DOWN to apply full system
82. through the main switch The main switch opens both lines when inthe OFF position Two 10 amp fuses are used to protect the complete electrical system and are located next to the main switch a Main Switch Test The following test will determine if line voltage is applied to connector CN12 which in turn would supply 120VAC power to the table 1 Plug the power cord into the 120VAC supply wall receptacle and turn the main switch ON 2 Disconnect connector CN12 See figure 6 2 Leave all other connectors connected CAUTION Line voltage 120 VAC will be mea sured in this test Do not touch uninsu lated connector pins or meter test leads 3 Use an AC voltmeter capable of measuring 120 VAC and measure the voltage between pins 1 and 2 black and white wires located in connector 12 See figure 6 1 You should receive line voltage 120 VAC Figure 6 1 Connector CN12 Test b Test Results If the correct voltage is obtained everything is good up to this point and the problem would have to be in another area If you do not receive the correct measurements the problem would have to be in the wires main switch fuses or power cord SOLENOID COIL 24 3500B C PENDANT 9 CONTROL 9
83. trol functions in either direction Turn the speed controls until desired values are obtained Back Section Up 65KG CM 925PSI Dn 65KG CM 925PSI Trendelenburg Up 65KG CM 925PSI Dn 65KG CM 925PSI Flex 70KG CM 995PSI Reflex 70KG CM 995PSI NOTE When adjusting Flex Reflex speed con trols set Reflex last Elevation There is not a speed adjustment for raising the table The speed control will only affect the rate of descent and it should equal the rate of elevation SECTION MECHANICAL TABLE ADJUSTMENTS 2 1 Back Section Gear Mesh Adjustment The gear mesh is adjusted by the use of an eccen tric cam This cam moves the gear teeth closer together to eliminate gear lash This adjustment arrangement compensates for any wear between the gears that might occur To adjust Loosen the cam locking allen set screw Use an allen wrench to rotate the eccentric cam See figure 2 1 Tighten the set screw when adjustment is complete ECCENTRIC CAM SET SCREW SS ALLEN WRENCH Figure 2 1 Eccentric Cam Adjustment 2 2 Hydraulic Cylinder Adjustment Back amp Leg Sections The hydraulic cylinder rams that control both the back and leg sections must move together so that these sections are not twisted when operated This is accomplished by the use of eccentric cams that move the cylinder bodies fore and aft to adjust their effective stroke NOTE Adjust gear mesh before adjusting ec centric ca
84. utput power to the relay box and also activates the battery charging circuit See figure 6 9 RELAY BOX RELAY BOX SIGNAL OUT 5 0 RELAY FUSE 15 CAPACITOR BATTERY gt CN14 CHARGING BOX Figure 6 9 Relay in Activated Position Page 46 NOTE The battery charging circuit is only operational when the table is in the AC120V operating mode c Switch Over Relay Test Using a DC voltmeter test the operation of the relay in both the OFF AC120V OFF and Activated AC120V ON positions See figure 6 10 NOTE The Switch Over Relay mounting block may have to be removed from the base for test access OFF AC120V OFF term 7 and term 1 24 to 28VDC term 7 and term 6 OVDC Activated AC120V ON term 7 and term 6 26 5 1VDC Figure 6 10 Switch Over Relay 6 7 Pendant Control The Pendant Control is part of the solid state multi plex logic control system The pendant control contains illuminated circuit board mounted switches anda micro processor The encoded output from the pendant control is serial bit stream logic The output signal is transmitted to the micro proces sors in the relay box where the logic is decoded and the appropriate relays for the selected function are activated Pendant Control troubleshooting should begin by switching the o
85. way or the other by pumping hydraulic fluid into the cylin der on either side of the piston Obviously if oil is pumped into one side of the cylinder a return path must be provided for the oil on the other side See figure 1 9 O RING O RING HYDRAULIC LINE Figure 1 9 Back Section Cylinder 2 Slide Cylinder Assembly This cylinder arrangement has two pistons one on each end of a ram which has rack gear teeth cut into its top surface These teeth mesh with a gear arrange ment that drives a rack gear connected to the bottom of the side frame When hydraulic fluid is pumped into one side of the cylinder the pistons are pushed in one direction the gear arrangement rotates and causes the table top to slide Oil pressure can be applied to either piston making the table slide end for end See figure 1 10 RACK GEAR O RINGS O RINGS PISTONS Figure 1 10 Slide Cylinder Assy 3 Kidney Lift Cylinders The two kidney lift cylinders are similar to the slide cylinder in that the ram has rack gear teeth cut into the top surface O Rings on each end of the ram allow the ram to also serve as the pistons The rack teeth cut into the top of the ram meshes with a pinion gear This gear meshes with other gears to supply the up or down drive for the kidney lift bars depending on which direction the oil is pumped into the cylinder See figure 1 11 Page5 1 o PINIO

SKYTRON 3500 O/R Table Service Manual

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