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To visualise the extreme performance of the smartServo BL 4000-M/D servo drive, we have chosen an example from nature: The ant can move objects that exceed its own body weight by a multiple. Just like the compact BL 4000-M/D, that moves for example a machine tool, a packaging machine or a robot precisely, dynamically and controlled. This is an important component for your current and future projects. 


High protection class for long-lasting operation in rough environments

Thanks to their particularly robust design and excellent manufacturing, the decentralized smartServo drives comply with protection class IP67.

The IP67 protection class protects the servo drives against dust, contact and even submersion. This allows them to be used without a protective housing. They quickly and effectively meet even “large” requirements.


STO – Safe Torque Off

Disconnection of the energy supply to the drive according to EN 61800- 5-2. This safety function ensures that the drive is unable to deliver energy.

SS1 – Safe Stop 1

The drive is braked self-sufficiently to idle within a defined time using a defined slowdown ramp and then the energy supply is switched off safely. SS1, Type C is supported.

Saving of control cabinet space

  • Usually no control cabinet required for servo drives
  • No cabling between motor and servo drive if the servo drive is installed on the motor
  • Supply with low voltage of 48 V via PELV power supplies or batteries
  • No high voltages at the motor and servo drive
  • USB and Ethernet as parameterization interface
  • Fieldbus on board EtherCAT, PROFINET, optional CANopen
  • Bluetooth interrogates the servo drive status via smartphone or tablet


  • Single phase servo drive to 800W
  • Direct-on-line operation
  • BlueTooth
  • Simple commissioning through software wizard
  • Fieldbus on-board

Fieldbus options

The smartServo drive family features software selectable Fieldbus interfaces, without additional hardware

  • EtherCAT
  • ProfiNET
  • CANopen

Universal encoder interface

The smartServo family of drives can operate with rotary, linear and torque motors alike. Suitable feedback devices include, Resolver, Incremental Encoder, SinCos encoder (single-/ multiturn) with Hiperface, high resolution encoders as well as single-/ multiturn absolute encoder with EnDat interface.


Universal encoder evaluation

  • EnDat 2.2
  • Resolver
  • Analogue and digital incremental encoders
  • BISS


  • Highest performance and dynamics internal sampling time < 32 μs
  • USB and Ethernet as parameterisation interfaces
  • Fieldbus on board EtherCAT/ProfiNET/CANopen
  • Universal encoder evaluation HIPERFACE®, HIPERFACE DSL®, EnDat 2.2, resolver, digital and analogue incremental encoders
  • Bluetooth interogation of the servo drive status via mobile phone or tablet PC
  • Integrated EMC filter
  • Integrated brake chopper, external brake resistance can be connected
  • Separate 24 V DC supply for controller unit
  • UL certification in preparation

Technical Data for BL 4102-C and BL 4104-C

Features BL 4840-M

(motor mounted)

BL 4840-D

(separate from motor)

Supply voltage 24 to 48 VDC
Control voltage 24 VDC [± 20 %]
DC link voltage 24 to 48 V
Output power 1900 VA
Max. output power for 2 s 5000 VA
Rated output current 40 Arms
Max. output current for 2 s 120 Arms
Internal brake resistor -
Continuous power / pulse power -
External brake resistor -
Holding brake -
Dimensions (without flange) servo drive H x W x D 80 x 65 x 125 mm 82 x 115 x 125 mm
Weight 1 kg 1.2 kg

Technical Features

Features Values
EMC directive 2014/35/EU verified by application of the harmonised standard EN 61800-3
Low-voltage directive 2014/30/EU verified by application of the harmonised standard EN 61800-5-1
cULus certification UL 508C, C22.2 No. 274-13
Admissible temperature ranges Storage temperature: -25 °C to +70 °C, operating temperature: 0 °C to +40 °C+40 °C to +50 °C at reduced power 2,5 % / K
Admissible installation height Mounting height max. 2000 m above msl, above 1000 m above msl with power reduction 1 % pro 100 m
Humidity Relative humidity up to 90 %, not bedewing
Protection degree IP67
Protection class I
Pollution degree 2
Inputs 8 x digital in (24 VDC), 1 x analogue in (± 10 VDC)
Outputs 1 x analogue out (±10 V), 2 x digital out (24 VDC)
Interfaces USB 2.0, Ethernet, CAN-Bus, EtherCAT, ProfiNET, MicroSD card
Encoder evaluation EnDat 2.2, HIPERFACE®, HIPERFACE DSL®, resolver, analogue and digital incremental encoders with/without commutation signals, BISS (Type C)