PAU-S1 The PAU-S1 is a high power, brush-type PWM servo amplifier in a 6U Eurocard form factor. Control can come from an analog (10V) command, or digital Magnitude and Direction signals. This multi-purpose amplifier contains both Velocity and Torque feedback loops. Inputs are provided to allow tachometer feedback in the Velocity Mode. The Torque Mode can be used for torque control applications, or in conjunction with a digital servo controller capable of computing Position and Velocity loop values. The Torque Mode can also be used for feedback in the Velocity Mode, with or without a position controller. The high switching frequency of the PAU-S1 allows the amplifier to drive very low inductance loads.

The PAU-S1 has Under Bias Voltage shutdown as well as Over Current, Over Voltage, and Over Temperature protection. Fault conditions are reported digitally to the controller connections, and indicated visually by front panel LEDs.

An optional backplane is available to allow quick and easy access to motor, power, control and other I/O signals. This greatly simplifies implementing the PAU-S1 in a motion control system.


  • Eurocard 6U Form Factor
  • Digital Control of PWM using Magnitude and Direction Bits
  • Over Voltage, Over Current, Over Temperature, and under Bias Protection
  • Jumper Selectable Velocity or Torque Modes
  • PWM Frequency: 20 or 80 kHz
  • Full Isolation between Logic and Power Circuitry
  • Continuous Current: 5, 7.5 or 15 Amperes
  • High bandwidth
  • Bus Voltage: 100 - 270 VDC
  • Advanced Design, high Quality and High Reliability at a Lower Cost


Standard Models: 10/10 27/15 27/30
Bus Voltage 100  VDC 20 to 100 VDC 20 to 100 VDC
Peak Output Current* 10 A for 0.5 Sec 15 A for 0.5 Sec 30 A for 0.5 sec
Continuous Output Current* 5 A 7.5 A 125
Command Input Voltage 0 to 10V 0 to 10V 0 to 10V
Command Input Impedance 20 kOhm 20 kOhm 20 kOhm
Switching Frequency 80 kHz 20 kHz 20 kOhm
Minimum Load Inductance 0.1 mH 2.0 mH 2.0 mH
Torque Gain 1 A/V 1.5 A/V 3.0 A/V
Bandwidth 20 KHz 4 KHz 2 kHz
Weight 1.75 Lb (793 g)
Recommended Chassis CHU-S6 Eurocard
Available Accessories ACC-V1E Backplane, ACC-V2B Inductor Board, PSU-S1 Rack Mount Power Supply, ACC-V3A PMAC Interface Board

*All ratings with forced air cooling to maintain 40C heat sink temperature. Failure to keep constant air flow to the heat sink will reduce the output current capacity and may result in damage to the unit.

Ordering Information

Product Order Number
PAU-S1-10/10 Amp 100 VDC/10A Peak WS-006-0004
PAU-S1-27/15 Amp 270 VDC/15A Peak WS-006-0001
PAU-S1-27/30 Amp 270 VDC/30A Peak WS-006-0002
ACC-V1E Standard Backplane WS-011-0004
ACC-V2B Inductor Board WS-011-0006

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