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Brushless AC Servo Controller



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  • Part Number: 3RA2105
  • SKU: 3RA2105RE
  • Manufacturer: Reliance Electric
  • Series: HR2000 Servo

3RA2105 Technical Specifications

Manufacturer Reliance Electric
Series HR2000 Servo
Part Number 3RA2105
Input Voltage 208/230 VAC
Phase 3 Phase
Enclosure Chassis
Hz 50/60Hz

About the 3RA2105

HR2000 controller 3RA2105 is manufactured by Reliance Electric. The field adjustments available on this controller include the functions for static overload, current limit, over speed, speed amp offset, speed amp gain, reference trim, acceleration, deceleration, filter frequency set, filter Q.F. set, position loop gain, and tester input. The user must mount this controller in a suitable enclosure. In this case, that suitable enclosure is a chassis type enclosure. Only use copper wire that is 60/75° to wire this controller.

The rated speed is 3000 RPM and the maximum continuous amperes are 16. The AC input is 3PH/50/60Hz/200/220VAC (17.0 amps) or 3PH/60Hz/230VAC (15.5 amps). The overload is 200%. The encoder is 2500 PPR. The static overload range is 0-5 volts and the current limit range is 0-5 volts. The overspeed is 2300-4500 volts. The speed amp gain is 10-30 dB. The position loop gain is 0.3-4.8 mv/p.

Disconnect all power and wait five minutes before touching any parts. There is hazardous voltage that the user must be aware of in favor of caution. Check with the voltmeter to insure that DC bus capacitors are discharged. Components on the circuit card are at DC bus voltage and line voltage. The cover must be fastened and closed before the equipment is energized. This measure guards against possible venting, rupture, or explosion of the DC bus capacitors. Failure to follow these precautions could result in severe bodily injury or loss of life.

Frequently Asked Questions about 3RA2105

What are the input amps on a Reliance 3RA2105?
The input amps are between 15.5 and 17 on a 3RA2105. They are 15.5 when the 3RA2105 is at 230 VAC and 17 when the 3RA2105 is at 208 VAC.
What is the basis of starting up a 3RA2105?
Startup on a 3RA2105 is a two-part action. First, run the 3RA2105 in speed regulation mode with the 3RA2105 motor uncoupled for the machine or load. Then, run the 3RA2105 in selected regulation mode with the 3RA2105 motor coupled to the machine or load. 
What are the two main sections on 3RA2105?
3RA2105 has two major sections. 3RA2105 has a regulator section and a power section.
What is the manual for 3RA2105?
Manual D5-3018 is the manual recommended for 3RA2105, but there is also manual D5-3031 which will apply to a 3RA2105. The second manual is an installing, operating, and maintaining manual for HR2000 Servo Reliance drives. To obtain either manual, ask us for a copy of the manual.

Repair Services For 3RA2105

Type Lead Time Price Action
Repair Service 1-2 weeks $381

Our highly skilled technicians can repair your 3RA2105. 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