The BLU-S1 is a low power brushless linear servo amplifier in a Eurocard 3U form factor. It is ideally suited to high precision positioning applications or if electrical noise and excess motor heating cannot be tolerated, or when low inertia/low inductance loads must be driven. This amplifier can be configured for External Sinusoidal commutation or for self commutation using Digital Hall effect sensors.

The BLU-S1 is a single card unit with a small plug in Personality Component Carrier to allow customized component changes for the peak current, gain, and integration factors. Hall effect commutation or external sinusoidal commutation is jumper selectable. When using external sinusoidal commutation, the amplifier recieves two 120° out of phase sinusoidal command inputs. The optimal third phase is derived by the amplifier. This eliminates "cogging" and greatly enhances low speed operation. An optional backplane is available to allow quick and easy access to motor, power, control and other I/O signals.


  • Eurocard 3U Form Factor
  • Accepts Digital Hall Effect Sensors
  • Two Commutation Modes: Hall Effect and External Sinusoidal Input
  • Zero Electrical Noise
  • Optically Isolated Travel Limits and Amp Enable Inputs
  • Personality Component Carrier allows Custom Current Loop and Peak Current Configurations
  • Bus Voltage: 20 - 40 VDC
  • Continuous Current: 2 or 4 Amperes
  • Excellent for use with Precision Positioning Systems
  • Hall Power generated from Bus Voltage
  • Designed for Three-Phase Wye or Delta Wound Motors
  • Advanced Design, Superior Quality and High Reliability
  • One Year Parts and Labor Warranty


Standard Models: 4/8 4/15
Bus Voltage 20 to 40  VDC 20 to 40 VDC
Peak Output Current* 8 A for 0.5 Sec 15 A for 0.5 Sec
Continuous Output Current* 2 A 4 A
Command Input Voltage:

     Hall Commutation

     Sinusoidal Commutation


0 to ±10V

0 to ±5V


0 to ±10V

0 to ±5V

Command Input Impedance 10 kOhm 10 kOhm
Minimum Load Inductance 0 H 0 H
Torque Gain:

     Hall Mode

     Sinusoidal Mode


0.8 A/V

1.6 A/V


1.5 A/V

3.0 A/V

Bandwidth 20 KHz 20 KHz
Weight Narrow:  0.48 Lb (220 g) Standard:  0.91 Lb (410 g)
Recommended Chassis CHU-S3, CHU-S6 Eurocard
Available Accessories ACC-V1A Backplane, ACC-V1B Narrow Backplane, PCU-S1 Rack Mount Power Supply, ACC-V3A PMAC™ Interface Board

*All ratings with forced air cooling to maintain 40°C 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
BLU-S1-4/8 Amplifier 40 VDC/8A Peak WS-001-0006
BLU-S1-4/8 Amp 1.2" Width, 8A Peak WS-001-0019
BLU-S1-4/15 Amplifier 40 VDC/15A Peak WS-001-0007
ACC-V1A Backplane 2.4" Width WS-011-0003
ACC-V1B Backplane 1.2" Width WS-011-0005

 Click here to download this data sheet.

All data sheets are in Adobe Acrobat format.