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Installation & Operating Manual
MN704
BC141, BC142, BC142-5 & BC142-6
DC Control
Page 1: ...5 17 Installation Operating Manual MN704 BC141 BC142 BC142 5 BC142 6 DC Control ...
Page 2: ...Any trademarks used in this manual are the property of their respective owners Important Be sure to check www baldor com to download the latest version of this manual in Adobe Acrobat PDF format ...
Page 3: ...d Connection Shunt Wound Motors Only 2 3 Full Voltage Field 2 3 Plug In Horsepower Resistor Armature Fuse Kit 2 3 Armature Fuse 2 3 Remote Main Speed Potentiometer Connection 2 4 Voltage Following Connection 2 4 Enable Circuit Connection 2 5 Inhibit Circuit Connection 2 6 DC Tachometer Connection 2 6 Armature Switching and Dynamic Braking 2 8 Startup Adjustments 2 8 Trimpot Adjustments 2 9 Operati...
Page 4: ...ith a factory installed 25 Amp AC line fuse a 5 kΩ Main Speed Potentiometer and QD terminals All models are UL Listed USA and Canada and CE Approved SAFETY NOTICE A Warning statement indicates a potentially hazardous situation which if not avoided could result in injury or death A Caution statement indicates a potentially hazardous situation which if not avoided could result in damage to property ...
Page 5: ...ielectric Withstand test on the motor Failure to disconnect motor from the control will result in extensive damage to the control The control is tested at the factory for high voltage leakage resistance as part of Underwriter Laboratory requirements Caution Do not connect AC power to the Motor terminals A1 and A2 Connecting AC power to these terminals may damage the control Caution Baldor recommen...
Page 6: ...6 3 2 3 100 200 0 90 12 8 75 6 24 16 1 5 1 1 100 Table 1 2 General Performance Specifications Description Specification Factory Setting Speed Range Ratio 50 1 Armature Feedback Load Regulation 0 Full Load 50 1 Speed Range Base Speed 1 Tachometer Feedback Load Regulation 0 Full Load 50 1 Speed Range Set Speed 1 Line Voltage Regulation at Full Load 10 Line Variation Speed 0 5 Control Linearity Speed...
Page 7: ...1 4 MN704 ...
Page 8: ...PED 10 32 3 PLACES FUSE HOLDER FINGER SAFE COVER MOUNTING HOLES TAPPED 6 32 2 PLACES MOUNTING A 6 SLOTS 3 64 92 5 3 10 78 5 22 5 6 4 30 109 2 15 54 6 25 6 4 18 4 6 64 16 3 1 75 44 5 1 75 44 5 75 19 1 1 50 38 1 3 00 76 2 Electrical Connections Important Application Note To avoid erratic operation do not bundle the AC line and motor wires with signal or control wiring Also do not bundle motor wires ...
Page 9: ...r equipment to which it is or will be connected Electrical shock can cause serious or fatal injury Only qualified personnel should attempt the installation and start up procedures The control can be turned on and off using the AC line disconnect Auto Inhibit circuitry automatically resets critical components each time the AC line is interrupted This along with Acceleration Start and CL provides a ...
Page 10: ... 200 F F BC142 6 208 230 0 90 100 F L1 Step down operation PLUG IN HORSEPOWER RESISTOR ARMATURE FUSE KIT The Plug In Horsepower Resistor and Armature Fuse are supplied as a prepackaged kit Choose the appropriate Plug In Horsepower Resistor and Armature Fuse based on motor horsepower and voltage see Table 2 4 The Plug In Horsepower Resistor supplied separately must be installed to match the control...
Page 11: ...r to control motor speed Connect the low side of the potentiometer to Terminal P1 Connect the wiper of the potentiometer to Terminal P2 Connect the high side of the potentiometer to Terminal P3 Figure 2 3 Remote Main Speed Potentiometer Connection Front View Main Speed Potentiometer EN C ONN1 P3 MAX P1 P2 High Wiper Low Terminal P3 Terminal P1 Terminal P2 Voltage Following Connection An isolated 0...
Page 12: ...ch or contact is closed the motor will accelerate to the Main Speed Potentiometer setting When the switch or contact is opened the motor will decelerate to Stop An open collector PNP can be used in lieu of a switch or contact Figure 2 5 Enable Switch Or Contact Wired To The Enable Connector On to Run Open Collector C ONN1 MAX EN Open to Stop Close to Run or Contact Enable Switch the Mating Connect...
Page 13: ...erminal P3 Terminal P2 P3 P1 P2 EN P3 P1 P2 Inhibit Circuit Connection The control can be stopped and started with an Inhibit Circuit close to stop Wire the switch or contact to Terminals I1 and I2 When the switch or contact is closed the motor will coast to stop When the switch or contact is opened the motor will accelerate to the Main Speed Potentiometer setting An open collector NPN can be conn...
Page 14: ...sed with an 1800 RPM motor For a tachometer other than 7 Volts or 50 Volts per 1000 RPM or for a motor other than 1800 RPM an external 1 2 Watt resistor RT must be installed Install RT in series with the tachometer Connect one end of RT to Terminal T connect the other end of RT to the tachometer positive lead and connect the negative lead of the tachometer to Terminal I2 The value of RT Ω can be c...
Page 15: ...e motor begins to accelerate according to the setting of the ACCEL Trimpot to the Main Speed Potentiometer setting Startup Adjustments The control has selectable jumpers which must be set before it can be used J1 AC Line Input Voltage Selection Catalog No BC142 5 and BC142 6 only Jumper J1 is factory set to the 230 position for 208 230 Volt AC line input For 115 Volt AC line input set Jumper J1 to...
Page 16: ... are made with the main power applied an insulated adjustment tool must be used to prevent shock hazard and safety glasses must be worn TRIMPOT ADJUSTMENTS The control contains trimpots which have been factory set for most applications Some applications may require readjustment of the trimpots in order to tailor the control for a specific requirement Acceleration Trimpot ACCEL The ACCEL Trimpot is...
Page 17: ... only an AC ammeter is available wire it in series with either AC line input lead 2 Set the Main Speed Potentiometer to approximately 30 50 clockwise position 3 Set the CL Trimpot fully counterclockwise 4 Load the motor shaft in accordance with application requirements 5 Apply power and the CL LED will illuminate red Rotate the CL Trimpot clockwise until the desired current reading is observed on ...
Page 18: ...auses and the suggested corrective action for controls without optional forward brake reverse switch installed Table 2 4 Troubleshooting Guide without Optional Forward Brake Reverse Switch Symptom Possible Cause Suggested Corrective Action Motor is not running and Pilot Light not illuminated On Off AC Line Switch in Off Position Set On Off Switch to On Position Blown Line fuse Replace Line Fuse De...
Page 19: ...e voltage and the correct setting of the Voltage Select Switch Defective motor worn brushes etc Repair or replace motor Optional Accessories 1 Auxiliary Heat Sink Catalog No BC143 Doubles the horsepower rating of the control 2 Barrier Terminal Board Catalog No BC147 Converts the quick connect terminals of the control to a barrier terminal block Contains PC board mounted line and armature fuse hold...
Page 20: ...y P O Box 2400 Fort Smith AR 72902 2400 U S A Ph 1 479 646 4711 Fax 1 479 648 5792 International Fax 1 479 648 5895 www baldor com Baldor Electric Company MN704 All Rights Reserved Printed in USA A40249 Rev E 5 17 MN704 0517 ...
