Baldor BC140, Installation & Operating Manual

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2-4 MN703
Figure 2-3 Control Layout and Internal Connection Diagram
A- A+ F- F+ L1 L2 GND
F-
ARMATURE FIELD LINE
Important Considerations
Motor Type
The BC140 / BC140-FBR is designed for permanent magnet (PM) and Shunt Wound DC motors.
Controls operated on 115 Volt AC line input are designed for 90 Volt SCR rated motors. Controls
operated on 230 Volt AC line input are designed for 180 and 90 Volt (step-down) SCR rated motors.
Use of higher voltage motors will result in a reduction of the available maximum speed. Also, if motor
is not an SCR rated type, the actual AC line amperage of the control, at full load, should not exceed the
motor’s DC nameplate rating.
Torque Requirements
The motor selected for the application must be capable of supplying the necessary torque. To ensure
the motor is not overloaded, a DC ammeter should be connected in series with the armature. Be sure
the current under full load does not exceed the motor nameplate rating.
Acceleration Start
The BC140 / BC140-FBR contains an adjustable acceleration start feature which allows the motor to
smoothly accelerate from zero speed to full speed over a time period of 0.2-10 seconds.
The acceleration trimpot (ACCEL) is factory set for 2 seconds.
Limitation In Use
The BC140 / BC140-FBR control is designed for use on machine applications.