Baldor BC141 Installation & Operating Manual
Also see for BC141: Installation and operation manual
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1-1MN704Chapter 1IntroductionIntroductionThank you for purchasing the BC141, BC142, BC142-5 or BC142-6 full-wave variable speed DC motorcontrol. The control, with Surface Mount (SMT) construction, offers the user the ultimate in reliabilityand performance at an affordable price. The controls contain a unique patented super-fast Direct-Fed™ current limit circuit that protects the SCR power bridge against direct shorts1. The reliability ofthe control is further enhanced with the use of high-surge, 25 Amp SCRs, and AC line and armaturefusing2,3. The control is designed with exclusive Plug-In Horsepower Resistor® 3, which eliminatesthe need for recalibrating IR Comp and Current Limit when the control is used on various horsepowermotors. In addition, the rating of the control can be extended to 1.5 HP for controls with 90 Volt DCoutput and 3 HP for controls with 180 Volt DC output, by the use of an Auxiliary Heat Sink4. CatalogNos. BC142, BC142-5 and BC142-6 also allow operation of 90 Volt DC motors when used on 208/230Volt AC line input5.The versatility of the control is confirmed by its extensive list of standard features, such as: selectablearmature or tach feedback and adjustment trimpots for minimum speed, maximum speed, currentlimit, IR compensation, and linear acceleration and deceleration. The control includes Auto-Inhibit®,which eliminates surging during rapid AC line switching; pulse transformer triggering, which providescogless operation at low speed; and superior noise rejection circuitry, which eliminates false startsand blown SCRs. Enable (normally closed) and Inhibit (normally open) functions provide electronicswitching of control output.The output voltage of the control is a linear function of the Main Speed Potentiometer setting. Inaddition, the control can be used in a voltage following mode by supplying an isolated analog inputsignal to Terminals P2 (+) and P1 (-). The control is compact in size (only 4.30 X 3.64 X 1.25) andeasily replaces all competitive speed controls. The control is supplied with a factory installed 25 AmpAC line fuse, a 5 kΩ Main Speed Potentiometer and QD terminals. All models are UL Listed (USA andCanada) and CE Approved.SAFETY NOTICEA Warning statement indicates a potentially hazardous situation which, if not avoided, could result ininjury or death.A Caution statement indicates a potentially hazardous situation which, if not avoided, could result indamage to property.A Note indicates additional information that is not critical to the installation or operation.WARNING: This equipment may contain voltages as high as 1000 volts! Electrical shock can cause serious or fatalinjury. Only qualified personnel should attempt the start-up procedure or troubleshoot this equipment.WARNING: Be sure the system is properly grounded before applying power. Do not apply AC power before youensure that all grounding instructions have been followed. Electrical shock can cause serious or fatalinjury.WARNING: Electrical shock can cause serious or fatal injury. Be sure that all power is disconnected and there isno voltage present from this equipment or equipment to which it is or will be connected. Electricalshock can cause serious or fatal injury. Only qualified personnel should attempt the installation andstart-up procedures.WARNING: Electrical shock can cause serious or fatal injury. Verify there is no voltage phase-to-phase or phase-to-neutral at the motor leads before connecting motor to this control. Motor may have high voltagepresent even when disconnected from this control.WARNING: Do not use motor overload relays with an automatic reset feature. These are dangerous since theprocess may injure someone if a sudden or unexpected automatic restart occurs. If manual resetrelays are not available, disable the automatic restart feature using external control wiring.WARNING: This unit has an automatic restart feature that will start the motor whenever input power is appliedand a RUN (FWD or REV) command is issued. If an automatic restart of the motor could cause injury topersonnel, the automatic restart feature should be disabled.WARNING: Using a jumper to eliminate the start/stop function will cause the motor to run at the Main SpeedPotentiometer setting when the AC line is applied. |
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