Baldor BSC 7107 DC manual Section Adjustments, Current Limit Adjustment

Section 3

Adjustments

Current Limit Adjustment

The current limit adjustment is factory set at 10 AMPS and you should not have to increase this setting for the Series BSC 7107 control. Rotating the I Limit potentiometer on the upper board CCW decreases the current limit.

To calculate motor current, refer to Figure 2-2 and measure the voltage (VTP) at the “Scaled motor current test point”. The voltage should be 770mV for a 7 AMP motor.

VTP	+ MotorCurrent +	770mv	+ 7A
110mv￿A		110mv￿a

The correct setting of the I Limit potentiometer is 125% of the FLA rating of the motor.

1.Preset the I Limit pot fully CW for maximum FLA.

2.Apply power and run the motor at full or normal running speed.

3.Load the motor to 125% of its FLA rating (or the desired maximum load).

4.Rotate the I Limit pot CCW (clockwise) slowly until the measured motor current begins to decrease.

5.Slowly rotate the I Limit pot CW to just obtain the 125% FLA measurement.

Note: Do not use the Current Limit trimpot as a torque control or to reduce the speed of a motor.

Caution: Keep the average continuous DC current draw under 7 amperes, and make sure the motor is rotating. A stalled brushless DC motor can quickly overheat the control and/or the motor resulting in damage to either or both devices.

Adjustments 3-1