Section 1.0 Section 2.0 Section 3.0 Section 4.0
Contents
1. MCD 200 Series Warnings 2 Section 1 0 Spare Parts 1 3 GontroliP CB 3 1 2 Interface PCB da efe ater nce eee cts 5 1 3 50 5 a etd ee 7 1 4 Bypass Contactors 9 1 5 Current Transformers 11 Section 2 0 m Tests 2 1 MCD 201 Start Performance Test 12 2 2 MCD 202 Start Performance Test 13 2 3 Run Performance 13 2 4 Power Circuit Test 15 2 5 Control INOUt Fest 16 2 6 Power Voltage Supply 17 Section 3 0 Component Replacement Procedures 3 1 Disassembly Sequence 007 030 18 3 2 Exploded View MCD 201 007 030 19 3 3 Exploded View MCD 202 007 030 20 3 4 Disassembly Sequence 037 055 21 3 5 Exploded View MCD 201 037 055 22 3 6 Exploded View MCD 202 037 055 23 3 7 Disassembly Sequence 075 110 24 3 8 Exploded View MCD 201 075 110 25 3 9 Exploded View MCD 202 075 110 26 Section 4 0 m Appendix 4 1 Typical Causes of SCR Damage 27 4 2 Output Relay Compatibility 28 4 3 Control Input Failure 29 MG 17 D1 02 VLT is a registered Danfo2. MCD 200 Series Refit the Interface and Main Control PCBs Check for correct operation e Verify Bypass Contactor operation using the following procedure Remove the Main Control PCB and Interface PCBs Using a 24 VDC source momentarily apply voltage to the Bypass Contactor control pins as shown in the pictures below The Bypass Contactors are latching so voltage needs to be applied in both directions to fully check operational integrity m 44 Bypass Control Pins MCD 200 075 090 110 Bypass Contactor does not operate it must be replaced e Verify Main Control PCB and Interface PCB operation using the following procedure Replace the Main Control PCB f correct operation is not restored refit the original Main Control PCB and replace the Interface PCB If correct operation is not restored replace both the Main Control PCB and the Interface PCB Bypass Control Pins MCD 200 037 045 055 14 MG 17 D1 02 VLT is a registered Danfoss trademark 2 200 This procedure tests the soft starter power circuit including the SCR Interface PCB and Main Control PCB The soft starter must be disconnected from all power sources This test is performed using a 500 V DC insulation tester Low voltage ohm meters or multimeters are not adequate Test e Disconnect the incoming supply L1 L2 13 and control
3. XX v 1 00 10 GOW 91 200 20 GOW XX 91 0LL 06 GOW 91 060 0 GOW 91 8 0 0 GOW number per unit XX Q 1 GGO LOc GOW 91 8 0 LOc GOW 91 260 LOc GOW 91 060 0 GOW 91 000 LOc GOW 91 810 0 GOW 91 810 0 GOW 2 219 m O NIO N o 1090 09 2 Sly S 8 58 t 9 2 o z to c 8 8 5 O 6 0 c 210 NIO N 9 959 gt O T O O Main Control PCB 91 200 6 Models Kit Part Number 0 GOW Item ID CV1 Models 175G9015 990 02385 00 175G9017 990 02383 00 Models 175G9014 990 02384 00 175G9016 990 02382 00 175G9010 990 02380 00 1756901 1 990 02381 00 175G9014 990 02384 00 175G9015 990 02385 00 MG 17 D1 02 VLT is a registered Danfoss trademark Spare Parts MCD 200 Series 990 02378 00 990 02379 00 990 02382 00 990 02383 00 175G9012 175G9013 175G9016 175G9017 ee DRM rer a MG 17 D1 02 VLT is a registered Danfoss trademark MCD 200 Series Interface PCB Kit Part Number Item ID 175G9018 990 02386
4. supply e Motor fault e loose connection in power circuit before or after the starter e Power factor correction connected to the output of the soft starter e Over corrected bulk power factor correction on a lightly loaded system causing severe ringing voltages In most cases failure caused by Overvoltage will be indicated by physical damage to the MOVs 2 These are located on the underside of the Interface PCB Overtemperature e Blocked heatsinks or restricted ventilation e Inadequate ventilation e Excessive ambient temperatures If the internal bypass relay does not operate SCRs will eventually fail due to thermal stress Protecting SCRs The SCRs used in modern soft starters are rugged and provide reliable operation in most industrial environments without the need for additional protection However the potential for SCR damage can be reduced by use of semiconductor fuses and or line contactors Semiconductor fuses Use of semiconductor fuses reduces the potential for SCR damage caused by short circuits on the output of the starter Note that protection systems such as circuit breakers or HRC fuses do not operate quickly enough to protect SCRs from short circuits Line contactors SCRs are most vulnerable to damage caused by overvoltage when they are in the off state and have voltage applied to their input terminal In this condition the SCR is blocking the full line voltage Use of a line contactor to remov
5. 201 037 MCD 201 045 MCD 201 055 MCD 201 075 MCD 201 090 MCD 201 110 MCD 202 007 MCD 202 015 MCD 202 018 MCD 202 022 MCD 202 030 MCD 202 037 MCD 202 045 MCD 202 055 MCD 202 075 MCD 202 090 MCD 202 110 17569032 17569033 17569034 17569035 17569036 17569037 17569038 17569039 17569040 17569041 17569042 MCD 200 Soft starters may be fitted with Semikron or Eupec SCRs The MCD 200 SCR spare part kits may include either Semikron or SCRs e The Semikron and Eupec SCRs are fully interchangeable and can be mixed within the same soft starter e Connect the firing looms according to the diagrams below 175G9032 175G9033 175G9034 175G9035 175G9036 i I White Yellow 4 765 16 54 E 177HA328 10 SEMIKRON EUPEC MG 17 D1 02 VLT is a registered Danfoss trademark 7 sped Spare Parts MCD 200 Series 175G9037 175G9038 175G9039 4 vellow o Red 1 1 4 White SEMIKRON 171 2910 17569040 17569041 17569042 5 511 lO
6. Green changes state from flashing to on Measure the voltage across each controlled phase L1 to T1 and L3 to This should be less than 0 5 V AC e When a stop command is given listen for the bypass relay opening If soft stop is being used this should occur when the Run LED Green changes state from on to flashing If no soft stop is being used this should occur when the Run LED Green changes state from on to off Action 1 If the line voltage is not measured across the MCD 200 when in the off mode The Bypass Contactor is likely to be damaged and should be replaced ATTENTION The Bypass Contactors used in the MCD 200 are latching The MCD 200 control circuits are designed to open the Bypass Contactors even in the event of removal or loss of control voltage However it is still possible that the Bypass Contactor may be closed when there is no control supply to the MCD 200 On application of control voltage the MCD 200 will open the Bypass Contactors 2 Bypass Relay does not operate The Bypass Contactor Main Control PCB Interface PCB or connection between these items may be faulty e Verify plug connections between the Main Control Module Interface PCB and Bypass Relay using the following method Unplug the Main Control PCB from the Interface PCB Unplug the Interface PCB from the Bypass Contactors MG 17 D1 02 VLT is a registered Danfoss trademark 13 51591 Tests
7. SEMIKRON Red Black uw Yellow White 177HA330 10 EUPEC MG 17 D1 02 VLT is a registered Danfoss trademark MCD 200 Series Spare Parts 011 606 GOW 060 20 GOW 920 202 GOW 990 202 GOW Sv0 c06 GOW 260 006 GOW 060 606 GOW 20 00 GOW 810 606 GOW 910 206 GOW 200 006 GOW 011 102 GOW 060 106 GOW 8 0 109 GOW number per unit 990 102 GOW 9 0 106 GOW 460 106 GOW 060 106 GOW 260 102 GOW 810 106 GOW 910 106 GOW 200 106 GOW Bypass Contactors Kit Part Number Item ID 00 17569043 990 02393 00 175G9044 350 02375 175G9045 350 02367 00 175G9043 990 02393 00 175G9044 350 02375 00 MG 17 D1 02 VLT is a registered Danfoss trademark Spare Parts MCD 200 Series 175G9045 3850 02367 00 MG 17 D1 02 VLT is a registered Danfoss trademark 011 202 GOW 060 20 GOW 920 202 GOW 990 202 GOW 0 02 GOW 260 006 GOW 060 606 GOW 620 006 GOW 810 606 GOW 910 206 GOW 200 006 GOW 011 102 GOW 060 106 GOW 8 0 109 GOW 990 106 GOW 0 109 GOW MCD 200 Series 460 106 GOW 060 106 GOW 20 106 GO
8. voltage A1 A2 A3 from the starter e Disconnect the motor cables T1 T2 T3 from the starter e Measure the resistance across each controlled phase in both directions L1 T1 13 13 T1 L1 T3 L3 The resistance should be between 30 and 500 kO and equal across both phases Action 1 If the resistance measured across any of the two controlled phases is less than 30 The SCR should be replaced ATTENTION 15 There is no need replace the MCD 200 a Interface or Main Control PCBs just because an SCR has been damaged Consider replacement of these parts only after having first replaced the damaged SCR s and checked for correct operation The likely cause of SCR damage should also be determined to prevent a repeat SCR failure Analysis of the MOVs situated on the MCD 200 Interface PCB and connected across each controlled phase L1 T1 and L3 T3 can provide a good indication of the mode of SCR failure MOV Location MCD 200 007 015 018 022 030 MOV Location MCD 200 047 045 055 MOV Location MCD 200 075 090 110 Overvoltage is the cause of SCR failure if the MOVs and or surrounding circuitry on the Interface PCB show signs of physical damage Overcurrent is the likely cause of SCR failure if the MOVs and or surrounding circuitry on the Interface PCB show no signs of physical damage Having determined the mode of the SCR failure the cause of the damage should be considered to ensure the d
9. 00 MCD 202 007 MCD 202 015 MCD 202 018 umber per unit 990 02394 00 990 02398 00 175G9019 175G9020 175G9021 990 02387 00 175G9022 990 02389 00 175G9023 990 02390 00 175G9024 990 02391 00 175G9025 990 02392 00 175G9026 990 02395 00 175G9027 990 02396 00 175G9028 990 02397 00 175G9029 990 02399 00 175G9030 990 02400 00 ee en e OL 17569031 990 02401 00 17569018 990 02386 00 17569021 990 02387 00 17569022 990 02389 00 17569023 990 02390 00 17569024 990 02391 00 17569025 990 02392 00 202 022 MCD 202 030 MCD 202 037 202 045 MCD 202 055 MCD 202 075 MCD 202 090 MCD 202 110 MG 17 D1 02 VLT is a registered Danfoss trademark syed aieds Spare Parts MCD 200 Series 175G9019 175G9026 175G9027 175G9028 Da c 990 02394 00 990 02395 00 990 02396 00 990 02397 00 17569020 17569029 17569030 17569031 990 02398 00 990 02399 00 990 02400 00 990 02401 00 220202 MG 17 D1 02 VLT is a registered Danfoss trademark MCD 200 Series SCRs Kit Part Number MCD 201 007 MCD 201 015 MCD 201 018 MCD 201 022 MCD 201 030 MCD
10. 5 Main Control PCB gt OTI Interface PCB Current Transformers 177HA334 10 Bypass Relays MG 17 D1 02 VLT is a registered Danfoss trademark Component Replacement 200 5 Disassembly Sequence 075 110 Step 3 Remove main Control PCB by lifting it up out Step 1 Remove plastic cover located on the right of the unit hand side of the frot face using the following procedure e With the MCD 200 unit on its side locate the blade of a small flat bladed screw driver between the lower edge of the plastic and the metal side plate e lever the cover off Step 2 Remove plastic lid complete with door from the body of the starter using the following procedure e With the MCD 200 unit on its side locate the blade of a small flat bladed screw driver in one of the four slots 2 each side on the side of the lid e While ensuring the screw driver blade is pushed into the deepest part of the slot the edge nearest the front face of the MCD 200 tap the Screw driver so that it is driven into the starter 5 10mm This will release the clip securing the lid the upper body moulding e Repeat the above procedure for each of the four clips Step 4 Remove the plastic body moulding using a flat or Torx screwdriver Step 4 Reassemble the MCD 200 is reverse order 24 MG 17 D1 02 VLT is a registered Danfo
11. W 810 106 GOW 910 106 GOW 400 106 GOW Current Transformers Kit Part Number 11 number per unit 175G9046 175G9047 175G9048 175G9046 175G9047 175G9048 MG 17 D1 02 VLT is a registered Danfoss trademark o o MCD 200 Series e Tests The following tests and measurements can be used to verify soft starter condition and operation MCD 201 Start Performance Test This procedure tests for correct operation of the MCD 201 during start Start mode is indicated by a flashing Run LED Green This test is performed using an AC voltage meter Test e Before commanding the MCD 201 to start measure the voltage across each controlled phase L1 T1 and L3 T3 This should be close to the system line voltage e When the MCD 201 is commanded to start measure the voltage across each controlled phase L1 T1 and L3 T3 This voltage should start close to the system line voltage and ramp down to less than 2VAC just before the MCD 201 reaches Run mode Action 1 If measurement shows voltage across the SCR to be equivalent to line voltage before start dropping to 2 VAC at run and motor starting problems are still experienced The cause of the motor starting problem is not the MCD 201 Look for outside causes to the problem 2 If zero voltage is measured across the SCR before or at the commencement of a start The SCR may have
12. amage does not reoccur Reliability of the modern SCRs used in the MCD 200 Soft starters is such that failures attributable to faulty manufacture are almost nil SCR damage is almost always caused by external influences Often these influences can be identified but in other cases the identification may prove difficult or impossible because the damaging event was temporary in nature Refer to 4 1 of this manual for information of Typical Causes Of SCR Damage 2 If the resistance measured across any of the two controlled phases is greater than 500 The Main Control PCB Interface PCB or connection between them items may be faulty MG 17 D1 02 VLT is a registered Danfoss trademark 15 51591 Tests MCD 200 Series Verify plug connections between the Main Control PCB and Interface PCB by Removing and refitting the Main Control PCB Check for correct operation If correct operation is not restored Replace the Main Control PCB Check for correct operation If correct operation is not restored Refit the original Main Control PCB Replace the Interface PCB Check for correct operation If correct operation is still not restored Replace both the Main Control PCB and the Interface PCB Control Input Test This procedure tests the condition of the soft starter control inputs This test is performed using a voltage meter e Remove any external wiring from the soft starter contro
13. anufacturers eg Klockner Moeller state that you cannot use PCB mount relays for direct Switching of their electronic contactor coils If this is the case there are two solutions 1 Usea MCD 200 soft starter output relay to control a slave relay This slave relay can then be used to directly switch the electronic contactor coil circuit 9 MCD 200 OUTPUT RELAY KIA KIM a SLAVE CONTACTOR RELAY COIL COIL A2 177HA33710 2 Some contactor brands have a volt free electronic input low voltage low current If this is available the MCD 200 output relay can be wired directly into this input for contactor control 28 MG 17 D1 02 VLT is a registered Danfoss trademark 2 200 Control Input failure Overview The MCD 200 soft starter can be operated by external 2 wire or 3 wire control signals External contacts switches are configured and wired into control input terminals N1 and N2 Cause of Control Input failure External contacts switches operating the control inputs must be rated for the control voltage being used and a continuous current of 100 Incorrect configuration and wiring of the external contacts switches to the control input terminals N1 and N2 may cause damage If long cable runs are used wiring must be twisted pair or shielded cable and must be separated from AC power cables minimum distance 300mm Testing for Control Input failure Refer to
14. e voltage from the SCR input when the starter is in the off state eliminates the chance of SCR damage due to overvoltage Note that when the soft starter is operating in Run mode the SCRs are bypassed by the internal bypass relay In this situation the soft starter is immune to damage caused by voltage fluctuations MG 17 D1 02 VLT is a registered Danfoss trademark 27 xipueddy Appendix MCD 200 Series Output Relay Compatibility Overview The MCD 201 soft starter has one fixed Main Contactor output relay Senses 330 The MCD 202 soft starter has one fixed Main PREEN CONTACTOR contactor and one programmable Trip Run output relay These PCB mount relays are often used for line contactor control 177HA338 10 Recent advances in contactor design have lead to many manufacturers using electronic contactor coils Initially these coils may appear to meet the specifications of the PCB mount relays However in some instances these electronic contactor coils have a high initial inrush current due to the internal switch mode power supply circuitry This can have a damaging effect on the PCB mount relays if the contactor coil is switched directly Solution Before using an MCD 200 soft starter PCB mount output relay for direct switching of an electronic contactor coil consult the contactor manufacturer supplier to see if this is advisable Certain contactor m
15. failed Perform the Power Circuit Test described later in this section 3 If the voltage across the SCR remains at system line voltage This indicates that the SCR on that phase is not firing The Main Control PCB Interface PCB or connection between them items may be faulty e Verify plug connections between the Main Control PCB and Interface PCB by Removing and refitting the Main Control PCB Check for correct operation e f correct operation is not restored Replace the Main Control PCB Check for correct operation e f correct operation is not restored Refit the original Main Control PCB Replace the Interface PCB Check for correct operation e f correct operation is still not restored Replace both the Main Control PCB and the Interface PCB MG 17 D1 02 VLT is a registered Danfoss trademark MCD 200 Series MCD 202 Start Performance Test This procedure tests for correct operation of the MCD 202 during start Start mode is indicated by a flashing Run LED Green This test is performed using an AC ammeter clip on or similar Test e Calculate the expected motor start current by multiplying the MCD 202 current rating by the Motor FLC setting Motor FLC pot and the Current Limit setting Current Limit pot e initiate a start and measure the actual motor start current on phase 1 L1 T1 and phase 13 3 Action 1 If the measured start current is as expected and motor starting
16. ing procedure With the MCD 200 unit on its side locate the blade of a small flat bladed screw driver in one of the four slots 2 each side on the side of the lid While ensuring the screw driver blade is pushed into the deepest part of the slot the edge nearest the front face of the MCD 200 tap the screw driver so that it is driven into the starter 5 10mm This will release the clip securing the lid the upper body moulding Repeat the above procedure for each of the four clips Step 3 Access is now available to all sections of the MCD 200 Component parts can now be removed and replaced as required Step 2 Remove upper body moulding using the following procedure With the MCD 200 unit on its side locate the blade of a small flat bladed screw driver in one of the four slots 2 each side on the side of the upper body moulding While ensuring the screw driver blade is pushed into the deepest part of the slot the edge nearest the heatsink of the MCD 200 tap the screw driver so that it is driven into the starter 5 10mm This will release the clip securing the upper body moulding to the lower body moulding Repeat the above procedure for each of the four clips Step 4 Reassemble the MCD 200 is reverse order ATTENTION 2 When refitting the upper body plastic ae removed in Step 2 the following technique is useful Push in on the lower body cover at a point next to the clip being located 1 while at the same ti
17. l inputs N1 N2 e Control voltage must still be connected to the soft starter A1 to A2 or A2 to A3 e Measure the voltage from terminal A1 to each control input terminal A1 to N1 and A1 to N2 Action 1 If no voltage is present the control input is damaged The Main Control PCB must be replaced Damage to control inputs is most commonly caused by application of incorrect control voltage by the user Application of incorrect control voltage is evidenced by damage to the MOV located on the Main Control PCB MOV Location Control PCB 16 MG 17 D1 02 VLT is a registered Danfoss trademark MCD 200 Series Power Voltage Supply Test There is no specific test procedure to check the condition of the soft starter control voltage supply e fthe Ready LED Red is off verify that correct control voltage is connected to the correct control voltage input terminals On CV1 models A1 to A2 voltage must be 24 V AC or DC 20 20 CV3 models A1 to A2 voltage must be 110 V AC to 240 V AC 10 1596 or A2 to A3 voltage must be 380 V AC to 440 V AC 10 15 Ready LED Red remains off the Main PCB is damaged and must be replaced MG 17 D1 02 VLT is a registered Danfoss trademark 17 51591 Component Replacement MCD 200 Series m Disassembly Sequence 007 030 Step 1 Remove plastic lid complete with door from the body of the starter using the follow
18. me pressing out and down on the upper body cover at a point directly above the clip being secured 2 MG 17 D1 02 VLT is a registered Danfoss trademark MCD 200 Series Exploded View MCD 201 007 MCD 201 030 Main Control PCB Interface PCB 177HA331 10 MG 17 D1 02 VLT is a registered Danfoss trademark 19 Component Replacement MCD 200 Series m Exploded View MCD 202 007 MCD 202 030 Main Control Interface PCB Current Transformers 177 4332 10 20 MG 17 D1 02 VLT is a registered Danfoss trademark MCD 200 Series Disassembly Sequence 037 055 Step 1 Remove plastic lid complete with door from the body of the starter using the following procedure e With the MCD 200 unit on its side locate the blade of a small flat bladed screw driver in one of the four slots 2 each side on the side of the lid e While ensuring the screw driver blade is pushed into the deepest part of the slot the edge nearest the front face of the MCD 200 tap the screw driver so that it is driven into the starter 5 10mm This will release the clip securing the lid the upper body moulding e Repeat the above procedure for each of the four clips Step 3 Access is now available to all sections of the MCD 200 Component parts can now be removed and replaced as required Step 2 Re
19. move upper body moulding using the following procedure e With the MCD 200 unit on its side locate the blade of a small flat bladed screw driver in one of the four slots 2 each side on the side of the upper body moulding e While ensuring the screw driver blade is pushed into the deepest part of the slot the edge nearest the heatsink of the MCD 200 tap the Screw driver so that it is driven into the starter 5 10mm This will release the clip securing the upper body moulding to the lower body moulding e Repeat the above procedure for each of the four clips Step 4 Reassemble the MCD 200 is reverse order ATTENTION 1 When refitting the upper body plastic i removed in Step 2 the following technique is useful Push in on the lower body cover at a point next to the clip being located 1 while at the same time pressing out and down on the upper body cover at a point directly above the clip being secured MG 17 D1 02 VLT is a registered Danfoss trademark 21 MCD 200 Series m Exploded View MCD 201 037 MCD 201 055 Bypass Relays Main Control PCB c m a oz az es bisi 2 n Interface SCR Heatsink 4NM SCRs m m m zx I MG 17 D1 02 VLT is a registered Danfoss trademark 22 MCD 200 Series m Exploded View MCD 202 037 MCD 202 05
20. nd local codes Electrostatic Precaution Electrostatic discharge ESD Many electronic components are sensitive to static electricity Voltages so low that they cannot be felt seen or heard can reduce the life affect performance or completely destroy sensitive electronic components When performing service proper ESD equipment should be used to prevent possible damage from occurring MG 17 D1 02 VLT is a registered Danfoss trademark MCD 200 Series Spare Parts 1 011 202 GOW 1 060 202 GOW 1 3 0 0202 AOW 1 980 202 COW 1 8 0 202 AOW 1 260 0 AOW 1 060 0 XX 71 660 c06 GOW 1 810 0202 GOW 1 910 0202 GOW 1 200 202 GOW XX v 1 0L LOO GOW 91 011 20 GOW 91 060 20 GOW 91 8 0 20 GOW 91 990 0 GOW 91 8 0 20 COW 91 260 20 GOW 91 060 20 GOW 91 220 20 GOW 91 810 20 GOW 91 810 20 GOW m Spare Parts 1 060 LOC GOW number per unit 1 320 102 GOW Xx y 1 980 102 GOW L GvO LOC GOW XX 71 ZE0 LOC GOW 1 060 102 GOW XX v 1 660 LOC GOW 1 810 102 GOW 1 910 102 GOW
21. problems are still experienced The cause of the motor starting problem is not the MCD 202 Check the MCD 202 settings are appropriate and look for outside causes to the problem 2 If the start current is not as expected The SCR may have failed Perform the Power Circuit Test described later in this section The Main Control PCB Interface PCB or connection between them items may be faulty e Verify plug connections between the Main Control PCB and Interface PCB by Removing and refitting the Main Control PCB Check for correct operation e f correct operation is not restored Replace the Main Control PCB Check for correct operation e f correct operation is not restored Refit the original Main Control PCB Replace the Interface PCB Check for correct operation e f correct operation is still not restored Replace both the Main Control PCB and the Interface PCB Run Performance Test MCD 200 soft starter incorporate internal bypass contactors This procedure tests the operation of the internal bypass contactors If the internal bypass contactor does not operate SCRs will eventually fail due to thermal stress This test is performed using an AC voltage meter Test e While MCD 200 is in the Off mode measure the voltage across each controlled phase L1 to T1 and L3 to T3 Line voltage should be measured e Start the soft starter and listen for the bypass relay closing This should occur when the Run LED
22. ss trademark MCD 200 Series m Exploded View MCD 201 075 MCD 201 110 Main Control PCB Interface PCB paris 9 p 1 7 e 2 EUM y i 116 a De yr 65 65 eS SSS 177HA335 10 MG 17 D1 02 VLT is a registered Danfoss trademark 25 Component Replacement MCD 200 Series Exploded View MCD 202 075 MCD 202 110 Main Control PCB Bypass Relays Interface PCB SCR Bus Bar 12 SCR Heatsink 4NM 6 1 G Current Transformers 177HA336 10 26 MG 17 D1 02 VLT is a registered Danfoss trademark MCD 200 Series Appendix Typical Causes of SCR Damage SCR damage is generally caused by one of three mechanisms overcurrent overvoltage or overtemperature Before replacing damaged SCRs it is important to identify the cause of damage if at all possible The following list details some of the common problems Overcurrent e Cable fault on output of soft starter e Motor fault e Start current and or start time exceeds the soft starter ratings e Starts per hour exceed the soft starter rating Overvoltage e Power supply transient or surge e Lightening strike direct or indirect on power
23. ss trademark 1 Warnings MCD 200 Series m Warnings Symbols used in this manual The following symbols indicate items that require The MCD 201 amp MCD 202 contain special attention dangerous voltages when connected to line voltage Only a competent electrician should carry out the electrical installation Improper installation of the motor or the MCD 201 amp MCD 202 may cause equipment failure serious injury or death Follow this manual and National Electrical Codes NEC and local safety codes Indicates a general warning Indicates a high voltage warning Avoiding soft starter damage Safety regulations Please read and follow all instructions in this manual 1 The soft starter must be disconnected from the Additionally take special note of the following mains if repair work is to be carried out 1 Do not connect power factor correction 2 Stopping the soft starter of the does not capacitors to the soft starter output Static power disconnect the equipment from the mains and factor correction if used must be connected on leaves one phase connected to the motor Thus the mains side of the soft starter the soft starter is not to be used as a safety Switch It is the responsibility of the user or the person installing the MCD 201 amp MCD 202 to provide proper grounding and branch circuit protection according to the National Electric Code a
24. the Control Input Tests detailed in Section 2 6 of this manual CAUTION Application of incorrect voltages to the control inputs may cause equipment damage and necessitate replacement of the Main PCB ATTENTION 158 Damage to the control inputs caused by application of incorrect voltages is not covered by warranty MG 17 D1 02 VLT is a registered Danfoss trademark 29 xipueddy
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