DC1-40U

About the DC1-40U

Reliance Electric manufactures DC1-40U, a DC motor control special customer controller model that is part of the DC1 Reliance drive series. This controller is contained in an open chassis.

If the drive will not go to zero torque or speed, the controller is faulty and must be replaced. If the motor cannot reach its top speed or deliver its rated torque, there may be a low line voltage, the circuit board may be faulty, there may be an improperly calibrated jumper, and there may be an overload. With process control modes, the maximum speed pots may be improperly set, or the reference signal may be producing less than the expected minimum value. To correct this fault, correct the rated line voltage, reset the maximum speed pots, adjust the source of the automatic reference signal or proper output signal range, check for the cause of overload (correct if necessary), rest the jumper, or replace the entire controller.

If the drive has unstable speed or poor regulation when applied as an armature voltage regulator, the circuit board may be faulty, or the IR drop compensation may be set incorrectly. If this fault occurs, readjust the IR drop compensation pot or replace the entire controller. If the motor speed is unstable with a changing load, the IR drop compensation pot is not set at zero. If this fault occurs, set the IR drop compensation pot to zero. If the motor runs at maximum uncontrolled speed, there is no D-C tachometer output signal, or the D-C tachometer polarity is not correct for the given direction of motor rotation (419 negative with respect to 519). If this fault occurs, verify the tachometer voltage and the tachometer coupling.

AX Control offers DC drive repair and refurbishment.  Talk to our staff today if you need a quote.