SB1B-14 - B&C Specialty Products
Contents
1. N DA OO Oo OF C J I THIS PART IS NOT STC d AND IS SOLD FOR AMATEUR BUILT AIRCRAFT ONLY2. Set engine to a minimum of 2100 RPM Turn primary alternator field switch OFF the STBY ALT ON annunciator should illuminate Increase system load to Page 4 of 8 approximately 20 to 25 amps The STBY ALT ON annunciator should begin to flash Reduce RPM and system load The STBY ALT ON annunciator should return to steady illumination Turn the primary alternator master switch ON again Check to see that the STBY ALT ON annunciator extinguishes Verify that the primary alternator is carrying the load by referencing the load meter voltmeter or ammeter as applicable Return the engine to idle RPM Shut down engine according to normal procedure Proceed to Step 14 Step 14 Update ship s weight and balance pilot operating handbook and maintenance records OPERATION OF THE SB1B 14 The SB1B 14 regulator is designed to control a standby alternator in a one bus one battery electrical system The standby alternator s output is connected in parallel with the primary alternator s output Since the SB1B 14 is on the same bus and senses the same voltage as the primary regulator both the primary alternator and standby alternator field switches should be ON in normal operation If the bus voltage falls below 13 0 volts for any reason such as a primary alternator or primary regulator failure the SB1B 14 will energize the standby alternator and cause the standby alternator warning light or optional annunciator to illuminat
3. connection Proceed to Step 12 Optional installation with SBK 14 wire the STBY ALT annunciator assembly and the Hall effect current sensor according to the wiring diagram on page 8 The current sensor may be secured to a location on the engine side of the firewall near the Standby alternator Proceed to Step 12 Connect ship s battery Negative terminal last and replace engine cowl Test system function as follows Standard installation Start the engine according to normal procedure With the engine running and the battery master switch ON turn the primary alternator field switch and standby alternator field switch ON Reduce system electrical loads to approximately 10 15 amps Set engine to a minimum of 2100 RPM Turn primary alternator field switch OFF the standby alternator incandescent warning light should illuminate Turn the primary alternator master switch ON again Check to see that the warning light extinguishes Verify that the primary alternator is carrying the load by referencing the load meter voltmeter or ammeter as applicable Return the engine to idle RPM Shut down engine according to normal procedure Proceed to Step 14 Optional installation with SBK 14 Start the engine according to normal procedure With the engine running and the battery master switch ON turn the primary alternator field switch and standby alternator field switch ON Reduce system electrical loads to approximately 10 15 amps
4. 2 9 4 AN3 3A 4 AN960 10L 4 MS21042 3 Description Alternator Circuit Breaker 2A Circuit Breaker SA Switch Toggle Wire 18 AWG White Tefzel Wire 22 AWG White Tefzel Bolt Flat washer Locking nut Items noted with an above items are available as part of a basic installation kit P N LR_INSTALL An advanced installation kit P N SBK 14 is also available to provide enhanced functionality Please contact B amp C Specialty Products www BandC biz phone 316 283 8000 for more information CHANGE IN WEIGHT AND BALANCE Installation of this item will impact aircraft weight by a nominal 0 6 pounds Variations in airframe station references for eligible aircraft prevent the inclusion of pre calculated weight and balance data Page 2 of 8 Step 1 Step 2 Step 3 Step 4 Step 5 Step 6 Step 7 Step 8 Step 9 INSTALLATION INSTRUCTIONS Preparation Refer to applicable service manual instructions remove and retain engine cowl Disconnect ship s battery Negative terminal first Refer to applicable service manual instruction remove existing regulator Select a suitable location to mount the SB1B 14 Mounting on the pilot s side of the firewall or inside the cabin near the panel is preferred linear controllers are electrically quiet and create no noise when properly installed NOTE Take care to choose a mounting location that will protect the SB1B 14 from heat vibra
5. Installation Instructions for Model No SB1B 14 Linear Standby Regulator With Over Voltage Protection B amp C Specialty Products P O Box B Newton KS 67114 316 283 8000 SB1B 14 Install Rev A 12 12 14 INTRODUCTION This kit is applicable to any aircraft requiring external control and regulation of a B type wound field Standby Alternator in a 14 volt one bus one battery system DESCRIPTION OF INSTALLATION 1 Remove engine cowl and disconnect aircraft battery 2 Remove existing regulator if applicable 3 Install new Standby Controller Regulator 4 Install 2A and SA circuit breakers standby alternator master switch and incandescent warning light on instrument panel 5 Wire the SB1B 14 Controller Regulator circuit breakers alternator master switch incandescent warning light and Hall effect current sensor optional 6 Reconnect battery and replace engine cowl 7 Update ship s weight and balance pilot operating handbook and maintenance records PARTS LIST The following parts are supplied with the SB1B 14 Qty Part No 1 SB1B 14 8 S814R6 1 S888 1 4 Description Standby Alternator Controller Regulator Terminal Ring 18 22A WG Warning Lamp Incandescent Yellow 14v The following parts are needed but not supplied with this kit BC410 H or equal CB2 or equal CB5 or equal Qty Part No 1 1 1 1 S700 2 3 or equal AR M22759 16 18 9 AR M22759 16 2
6. e Charging voltage for the SB1B 14 has been pre set at 13 0 volts This voltage does not normally need to be changed however if adjustment is required simply remove the 3 4 round plug from the side of the SB1B 14 and use a small screwdriver to turn the small adjustment screw clockwise to increase voltage counterclockwise to decrease voltage approximately 1 2 turn per 16 volts Use a digital voltmeter at the battery for this measurement OVER VOLTAGE PROTECTION should the standby alternator output voltage exceed 16 volts the 5A standby alternator field circuit breaker will open causing the alternator to be shut down As soon as the current drops to zero the protection circuit is reset and ready to operate again A few minutes should be allowed before the circuit breaker is closed to allow the circuit breaker time to cool Should it trip a second time assume that further investigation and or maintenance is required INSTALLATION TIPS 1 Avoid deviating from the installation instructions and wiring diagram The SB1B 14 has been designed to integrate into your aircraft electrical system in a very specific way with separate bus connections for sense and control Similarly the SB1B 14 also requires other associated components such as circuit breakers and an alternator field switch which meet certain specifications These connections and associated components are vital to proper system function 2 Use time proven component
7. eared In certain installations it is possible that engine speed will have to be near run up RPM or more for the system to provide useable output Intermittent problems are the hardest to find In composite aircraft a common root cause is poor system grounds metal aircraft can exhibit this defect also if proper system grounding is not a priority Noise problems can also be challenging To manage system noise problems consider the following e A unitized grounding system helps prevent noise problems by preventing voltage differences between different ground points e The battery acts as a noise filter in the system Poor connections to the battery or a battery in the initial stages of failing can add to or even cause noise problems e Shielding of low level audio leads especially microphone leads or headset leads is a necessity Sometimes the shields in the cables can separate from repeated flexing so a check of shield continuity with an ohmmeter may prove illuminating e Wire routing is important Separate noise carrying conductors like P leads from other wiring Avoid running noisy wiring parallel to other wiring in the same bundle Page 7 of 8 Wiring Diagram for SB1B 14 Voltage Regulator g Jo 8 o8eg GE f 0 0 i N Il i l D ab ar 7 il ie si pri 4 do DK x
8. ht The SB1B 14 is designed to drive an incandescent light only an LED will not provide satisfactory results viz it will remain constantly illuminated regardless of whether there is an actual over voltage or low voltage condition e Insure the integrity of your alternator field connector and associated wiring The SB1B 14 connects to the alternator by means of a single wire an intermittent connection at the alternator will result in erratic and unstable operation TROUBLESHOOTING GUIDE Refer to the wiring diagram found on page 8 and use a high impedance preferably digital volt ohmmeter DVM to make the following checks Please note that the engine should not be running the mags should be off and there should be no auxiliary power applied to the aircraft electrical system l Turn all switches OFF Use the lowest resistance scale on the DVM Check resistance between the battery negative terminal and both pin 7 of the regulator and the engine case Measurements over 0 5 Ohm to either would be cause for investigation In this case check the engine ground strap battery ground strap and regulator ground wire for loose or contaminated connections broken conductors or bad crimp joints If these measurements are less than 0 5 Ohm any of these three points may be used as reference for the following measurements Resistance from battery to pin 7 Ohms from battery to engine case Ohms Turn ON the battery master and alternato
9. nt Without disconnecting the field connector measure the field voltage on the alternator Use a thin probe or small gage wire wrapped around the probe to reach through the connector body and measure the voltage on the male blade coming out of the alternator It should measure within 0 5 volts of the measurement on pin 4 of the regulator A lack of voltage may indicate an open circuit between pin 4 of the regulator and the field terminal If an open field circuit is suspected the switches may be turned OFF the alternator field connector removed and a resistance measurement made between the connector and pin 4 of the regulator Look for near 0 Ohms Typically the field resistance of the alternator will be between 3 and 10 Ohms from the male field terminal blade to alternator case Field terminal voltage volts Alternator field resistance Ohms 6 With the switches ON check the voltage between the alternator output post or B lead and ground It should be battery voltage If not check the wiring between the alternator B lead and the battery positive terminal Look for loose or contaminated connections broken wires or an open breaker or fuse Alternator B lead voltage volts 7 Ifall of the voltages in the first 6 steps are close to the value specified the charging system should be operative If not check for a broken or loose alternator belt or if the alternator is spline driven check that the shear coupling has not sh
10. o ground using M22759 16 Tefzel wire and the supplied S814R6 ring terminals according to the wiring diagram on page 8 Be certain to establish ground connections to both terminal 7 and the threaded ground stud below the terminal strip Page 3 of 8 Step 10 Step 11 Step 12 Step 13 NOTE This step is important for all airframes and crucial for composite aircraft The SB1B obtains a redundant connection to ground through the threaded stud A jumper between terminal 7 and the ground stud will not provide this Ground connections must be totally independent and not rely on common fasteners Select 18A WG wire or larger and ring terminals for these connections Wire the 2A and 5A circuit breakers and standby alternator field switch using M22759 16 Tefzel wire according to the wiring diagram on page 8 NOTE If panel space is limited a 2A in line fuse may be substituted for the 2A circuit breaker associated with terminal 5 The 5A circuit breaker associated with terminal 6 MUST be used Connecting terminal 6 directly to the bus or using solid state breakers PTC thermistors will damage the regulator if there is an over voltage condition Standard installation wire the incandescent warning light using M22759 16 Tefzel wire according to the wiring diagram on page 8 Place heatshrink supplied over each wire for the warning light base solder the wires onto the base terminals and shrink the heatshrink over the
11. r field switches Measure the voltage on the battery bus and on pin 3 of the regulator The voltages should be equal within 0 2 volts A difference of greater than 0 2 volts may be caused by using a breaker as the source for pin 3 that supplies another device of considerable load Change to a lightly loaded breaker or a breaker dedicated to pin 3 and the low voltage lamp It is recommended that pin 3 NOT be jumpered to pin 6 If pin 3 has no voltage the regulator will operate but low voltage warning and over voltage protection will be lost Bus voltage volts Pin 3 voltage volts Measure the voltage on pin 6 of the regulator It should be within 0 5 volts of the bus voltage A difference of greater than 0 5 volts may be caused by poor contacts in the field breaker or field switch or poor crimp joints loose screw terminals in the wiring between the bus and pin 6 Absence of voltage on pin 6 will prevent the regulator from operating Pin 6 voltage volts Page 6 of 8 4 Check the voltage on pin 4 of the regulator The voltage should be approximately 1 2 volts less than the voltage on pin 6 A difference significantly less than 1 2 volts between pins 4 and 6 may indicate an open field circuit from pin 4 through the alternator to ground Voltage differences of several volts could indicate a bad regulator An ideal pin 4 voltage would be approximately 10 9 to 11 4 volts on a 12 6 volt bus Pin 4 voltage volts 5 Move to the engine compartme
12. s in your installation Our technical staff has found that a reliable installation is often made or broken by the associated parts used to install the SB1B 14 Here are several specific choices that can help you avoid trouble e Select a toggle type rather than a rocker type switch for the alternator field switch Our tear down analysis of the internals of each type has shown that the mechanical properties and basic materials used in a simple toggle switch will provide superior service over time Avoid split rocker switches in particular a common source of reliability woes as they accumulate time in service e Use KLIXON or Mechanical Products circuit breakers frequently used in general Page 5 of 8 aviation These well constructed single purpose devices are reasonably economical and will serve you well over time Avoid combination switch circuit breakers another common source of reliability issues e Use nylon pre insulated ring terminals supplied and crimp these with the correct tool Route wiring along existing harnesses where they exist and secure with nylon wire ties Insure that all wiring is tied away from chafe points and clear of all flight control mechanisms throughout the entire range of control movements Use a 5 1b pull test to check crimped connections verify the terminal is crimped on the wire not the insulation Avoid substituting an LED indicator light for the supplied incandescent warning lig
13. tion and water Select a suitable location to mount the incandescent warning light supplied or STBY ALT annunciator optional in your instrument panel The light should be positioned within the pilots peripheral vision generally a 45 degree angle in front of the pilot A panel location away from direct sunlight is preferred Select a suitable panel location to mount the 2A and SA circuit breakers A panel location within the pilot s field of vision and reach is recommended Select a suitable panel location to mount the standby alternator field switch A panel location immediately adjacent to the ship s battery master is recommended if practicable Regulator Installation Mount the SB1B 14 to the firewall or selected location with the terminal strip oriented down preferred On a metal firewall AN3 3A bolts AN960 10L flat washers and MS21042 3 locking nuts will be adequate to secure the regulator Wire the SB1B 14 power and control circuits using M22759 16 Tefzel wire and the supplied S814R6 ring terminals according to the wiring diagram on page 8 NOTE The SB1B 14 senses bus voltage through terminal 3 If the warning light is not desired terminal 5 may be left unconnected however terminal 3 must still be connected to the bus through a fuse or circuit breaker If terminal 3 is not connected to power the SB1B will not work Do not connect or jumper terminal 3 to terminal 6 Wire the SB1B 14 t
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