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The Vari Speed® A2000 is compact, rugged, reliable and flexible. Available in 1/2 - 3 HP control rating configurations, the Vari Speed A2000 Series incorporates surface mount technology to reduce package size and improve reliability.

The Vari Speed A2000 may be ordered with isolation, NEMA 12 or NEMA 4 Enclosures.

  • Compact, extremely rugged speed drive for standard permanent magnet or would-field DC motors
  • 120 or 240 VAC line input
  • Nine models rated for 1/8 to 3 HP
  • Available in chassis, NEMA 12 or NEMA 4 enclosure
  • LED status indicators for Power On, Run, and Current Limits
  • Chassis units are UL and cUL listed

Horsepower Range 1/8 - 1 (120V); 1 - 3 (240V)
Line Voltage 120/240; 1 phase
Armature Voltage (VDC)
Field Supply (VDC)

0-90 (120V); 0-180 (240V);
50/100 (120V); 100/200 (240V)
Speed Range:
Armature Feedback
Tachometer Feedback

50:1 at full torque
200:1 at full torque
Speed Regulation:
Armature Feedback
Tachometer Feedback

±2% of base speed (for 95% load change)
±1/2% of set speed (for 95% load change)
Ambient Temperature 104°F (40°C) enclosed;
131°F (55°C) chassis
Control Adjustments:
Minimum Speed
Maximum Speed
Range (% control rating)
IR Compensation
Current Limit

0 to 50% control rating
50 to 110% control rating
isolation optional

0.5 to 5 seconds
0.5 to 5 seconds
Adjustable (0-25% of rated output)
10-150% control rating
Process Signal Input
Tachometer Feedback
Tachometer Follower

20.8 V/1,000 RPM
Process Output Optional, speed follower
Potentiometer 5K ohm, 1W potentiometer item 176B1121 available as option
Reference Supply Voltage 10 Volts
Status Indicator LEDs for Power On, Run and
Current Limit Status
UL/cUL Listed Chassis configurations only

A2000 configurations: (clockwise from lower left) Stand Alone, Enclosure, Heatsink, and Plate

DC Motors

Graham permanent magnet DC motors are optimized for use with Vari Speed A2000 Series DC controls. All motors are in stock for prompt delivery.

  • Designed to industry-standard NEMA frame sizes
  • 13 models rated from 1/8 to 5 HP
  • Easy access to brushes for quick brush replacement
  • Non-vented and fan-cooled versions
  • UL recognition on all modes; most models cUL rated

All options can be installed in the field.

AGB0: Provides isolation of non-isolated inputs and allows multiple A2000 controls to be controlled by a single process signal plus isolation open collector with adjustable time delay for current limit indication, and a speed follower output signal when used with a tachometer.

176B1121, 5K OHM, 1W Potentiometer

AC000 NEMA 12 enclosure with:
• Run/Jog/Stop switch
• Indicators for Power On, Run and Current Limit

Operating Conditions
AC Line Voltage: Rated voltage ±10%
AC Line Frequency: 48 to 62 Hz
Elevation: Up to 3,300 ft. without derating

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Download Catalog Pages:
a2000.pdf ( 3MB )
Download Instruction Manual:
a2000.pdf ( 294KB )