Price: $511.00

Vari Speed® R400 Speed and Torque Controllers for 1/4 to 2 HP DC Motors

Product Details

The Vari Speed® R400 is a full-wave DC regenerative control that provides high performance four quadrant speed and torque control. The R400 solid state controller converts single phase AC line power into an adjustable DC power to control 1/4 to 2 horsepower DC motors.

The R400's flexible design is easily selectable for speed or torque mode, tachometer voltage, dual voltage and for horsepower size. The R400 is designed with today's most desirable features including isolated input signals, status indicators, alarm outputs. When performing frequent directional changes, the R400 transfers excess system energy back to the AC line rather than wasting additional energy by the use of a dynamic brake resistor.

The R400 is designed, engineered and manufactured in the USA, and is UL and cUL listed.


Chassis Version
120 or 240 VAC, Selectable


  • Excellent regulation performance
  • Fast acting current limit
  • Starts into a rotating motor
  • 50 or 60 Hz selectable
  • Provides 150% load for one minute
  • Two and three-wire start-stop
  • Disable function
  • Reversible


  • Food and beverages
  • Machinery and material handling
  • Packaging and chemicals

Regenerative (Four-Quadrant) Control

Regenerative DC drives are able to provide complete control of a DC motor's speed and torque simultaneously. A regenerative drive has the capability of producing torque in either braking or motoring modes, while operating a motor's speed in a consistent direction of rotation. The capability to provide braking torque is a result of the drive's ability to operate in all for quadrants of the motor's speed/torque curve.


Control ParametersSpecificationsFactory Settings
Input Power
Line Voltage (1Ø) VAC ±10%120 or 240240
Line Frequency (Hz)50 or 6060
PLC or Process Input
Follow Voltage (VDC)±10
Speed and Torque Potentiometer (Kohm, 1/4 W)2.5
Remote Two or Three Wire Start-StopOn/Off-
Tachometer @ 1,000 RPM (VDC)7 or 20.8-
Armature Current Max (Amps, DC)10.8 (2.0)10
Motor Rating at 120 VAC (HP)1/4 - 1 (1/30 - 1/8)-
Motor Rating at 240 VAC (HP)1/4 - 2 (1/20 - 1/4)2
Armature Voltage at 120 VAC (VDC)0 ±100-
Armature Voltage at 240 VAC (VDC)0 ±200180
Field Voltage at 120 VAC (VDC)**100
Field Voltage at 240 VAC (VDC)**200
Field Current at 120 VAC (Amps)**1 (nominal)
Field Current at 240 VAC (Amps)**1 (nominal)
Service Factor1.0
Overload for One Minute (%)150100
Start/Stops per Minute (Max) @ Full Load130
@ Speed Change 100%±12
Forward Acceleration Rate (sec)0.15 - 84
Reverse Acceleration Rate (sec)0.15 - 84
Minimum Speed/Torque (%)0 - 500
Maximum Speed/Torque (%)50 - 110100
Forward Current Limit (%)0 - 150100
Reverse Current Limit (%)0 - 150100
IR Compensation (%)0 - 2512
Dynamic of Loop Regulation-50%
1Reflected inertial 10.7 lb.in2 at 1HP motor (55º ambient temperature).
*( ) For 176B8013
**176B4001 only


Standard Product FeatureApplication Benefit
Multiple rated unitOne unit can be used for 120 or 240 VAC operation of 1/4 to 2 HP PM or wound field DC motors
Regenerative controlAllows 4-quadrant operation to maintain complete control of motor and load
Speed or torque controlProvides proper motor control for application requirements
Excellent regulation performanceImproves overall system operation
Fast acting current limitCan quickly react and compensate to load changes
2- or 3-wire start/stopProvides flexibility in system logic
Isolated logic inputsEasy connection of peripheral equipment
Alarm outputProvides remote indication of an undesirable situation
Status indicatorsVisual indication of primary control status
150% load capabilitiesExtra power for intermittent overloads
ReversibleContact Closure Fwd/Rev or ±10 VDC In

Price: $511.00