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DC Motor Controller



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  • Part Number: DC1-40U
  • SKU: DC140URE
  • Manufacturer: Reliance Electric
  • Series: DC1 Drives

DC1-40U Technical Specifications

Manufacturer Reliance Electric
Series DC1
Part Number DC1-40U
HP 1.0/2.0 HP
Input Voltage 115/230 VAC
Phase 1 Phase
Enclosure Chassis
Hz 50/60Hz

Product Description

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. 

Frequently Asked Questions about DC1-40U

Is a DC1-40U compatible with any Reliance motor?
Reliance DC1 controllers are compatible with all permanent magnet and wound field D-C motors. The DC1-40U controller is performance matched to a specific DC1 machine.
What type of regulator is a DC1-40U?
A DC1-40U is a basic regulator.
What is the typical efficiency performance of a DC1-40U?
The typical efficiency of DC1-40U is 81% at rated speed and load. When measuring only the controller of the DC1-40U, the DC1-40U controller efficiency could be up to 97%.
What is the overload capacity on a Reliance DC1-40U?
The overload capacity on DC1-40U is 150% for one minute and 250% for one second on a DC1-40U

Repair Services For DC1-40U

Type Lead Time Price Action
Repair Service 1-2 weeks $402

Our highly skilled technicians can repair your DC1-40U. All of our repairs come with a 3 Year AX Control Warranty. Please contact us for additional information about our repair process. To receive the repair pricing and lead time listed above please process your repair order via our website. The following repair options may be available upon request:

  • 48-72hr Rush Repair
  • Detailed Repair Reports
  • AX Control Certificate of Warranty

AX Control Warranty Info

All products we sell are backed by our unparalleled warranty. A warranty certificate will be provided with your order upon request.
All PLCs, HMIs, and Turbine Control Boards: 3 Years
All AC/DC and Servo Drives: 2 Years
All Motors: 1 Year
Learn More