ESR Pollmeier GmbH
Servo Drive Technology

Servo Drives New Generation

Characteristics of the Servo Drives New Generation

  • Digital servo drives for AC servo motors and direct drives (torque motors, linear motors)
  • Compact drives for control cabinet installation, complete with built-in power supply for direct connection to 230 V~ AC (size 1) or 3×400/480 V~ AC (size 2 and 3) (wide-range inputs)
  • Integrated safety system, wear-free, two-channel (PL e according to ISO 13849-1 and SIL 3 according to IEC 61800-2)
  • Design conforms to EMC requirements (CE marked; class A standard, class B through accessories)
  • Switching frequency 8 or 16 kHz selectable for optimum dynamic characteristics and small motor power loss
  • High dynamics and control quality through signal processor for digital control of current and speed (controller cycle time 62.5 µs)
  • Position control loop (32-bit FP microcontroller, cycle time 1 ms) integrated, setting the target positions via communication interfaces (standard) or positioning control with 500 blocks (option)
  • Rapid acceleration, deceleration, and reversing of the motor by momentary current increase to up to three times the rated current
  • High processor power for fast axis control and communication
  • Extensive technology functions, positioning control as an option
  • 8 digital inputs, 4 digital outputs, additionally 2 analog inputs and 2 analog outputs (partly optional)
  • Communication via USB (standard) or EtherCAT, CANopen, Profinet, CAN, Modbus/TCP, or serial RS485, RS232 (e. g. Modbus RTU) according to CANopen profile CiA 402
  • Universal motor position sensor connector for resolver or absolute and incremental encoders with Hiperface, EnDat, or BiSS interface
  • Easy wiring, since all connections can be plugged in at the front and at the top (partly also at the bottom)
  • Comfortable commissioning and diagnosis using a personal computer
  • Function blocks for the development of customized application programs and easy integration in automation systems available
Data Sheet 6770.250 – Servo Drives New Generation

Order number BN 6771 BN 6772 BN 6773 BN 6774 *
Rated supply voltage 230 V~ ±10%, 50 .. 60 Hz
Rated DC-bus voltage 320 V DC
Permissible supply voltage 85 .. 253 V~ (corresponds to 115 .. 340 V DC-bus voltage)
Rated current (rms value) 0.8 A 2 A 4 A 6 A
Peak current (crest value) 3.4 A 8.5 A 17 A 25.5 A
for AC servo motors up to 0.5 Nm rated torque up to 1.5 Nm rated torque up to 3.5 Nm rated torque up to 5.5 Nm rated torque
Switching frequency 8 or 16 kHz (to be selected)
Control supply voltage 24 V DC ±20%, 0.8 A
Dimensions w×h×d 70 × 195 × 200 mm (size 1)

* BN 6774 (6 A device) servo drives may be operated up to a loading of 70% without restrictions. For a higher loading, the device must be installed next to a control cabinet fan or equipped with a sub-assembled fan.


Order number BN 6781 BN 6782 BN 6783 * BN 6785 BN 6787 *
Rated supply voltage 3×400/480 V~ ±10%, 50 .. 60 Hz
Rated DC-bus voltage 560/680 V DC
Permissible supply voltage 85 .. 528 V~ (corresponds to 125 .. 740 V DC-bus voltage)
Rated current (rms value) 2 A 4 A 8 A 16 A 32 A
Peak current (crest value) 5.5 A 11 A 22 A 45 A 90 A
for AC servo motors up to 3 Nm rated torque up to 7 Nm rated torque up to 17 Nm rated torque up to 35 Nm rated torque up to 85 Nm rated torque
Switching frequency 8 or 16 kHz (to be selected)
Control supply voltage 24 V DC ±20%, 0.5 A 24 V DC ±20%, 1.1 A
Dimensions w×h×d 70 × 275 × 200 mm (size 2) 190 × 275 × 227 mm (size 3)

* BN 6783 (8 A devices) and BN 6787 (32 A devices) servo drives may be operated at a power circuit switching frequency of 8 kHz without restrictions. With 16 kHz, the rated current is reduced to 6 A or 16 A (rms) and the pulse current to 22 A or 45 A (crest value), respectively.

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