/DUE diagnostic unit option

Diagnostic units are the perfect addition to our motors. They help to monitor production during operation, perform diagnostics and optimize maintenance intervals. For this reason, they should be included in every condition monitoring concept. With the new /DUE diagnostic unit for function and wear monitoring of brakes, your condition monitoring will be even more flexible and efficient.

Function and wear are always under control

/DUE diagnostic unit option
/DUE diagnostic unit option
/DUE diagnostic unit option

SEW‑EURODRIVE's new /DUE diagnostic unit option for the BE1 to BE122 brakes that have been tried and tested millions of times, as well as the new BF/BT11 to BF/BT 30 double brakes, takes on two tasks with just one measurement system: monitoring the function of the brake and determining the wear on the brake lining. It performs both tasks by continuously monitoring the working air gap of the brake. This way, you can also plan individual, wear-based maintenance intervals for your brake system. In practice, this means: You always have the function and wear of the brake under control.

The sensor is fully integrated into the brake and the evaluation electronics in the terminal boxes. As a result, you can easily use the /DUE diagnostic unit option even under difficult ambient conditions up to IP66.
As standard, it also has one digital output each for the function of the brake and wear on the brake lining, as well as an analog current signal that corresponds to the size of the working air gap.

The measurement system works contactlessly based on the eddy current principle; high-frequency alternating current flows through the sensors. The electromagnetic field induces eddy currents in the pressure plate, which change the sensor's AC resistance. The evaluation unit converts this change in impedance to an electrical signal (4 – 20 mA) that is proportional to the brake's working air gap.

The brake function is monitored using digital signals (NO contacts), and digital outputs (NC contacts) are used to indicate that the wear limits have been reached. Current outputs also allow continuous monitoring of brake wear.
In addition to the outputs, LEDs on the evaluation unit also indicate the function and wear of every partial brake.

Consult our sales team.

  • Our experts understand your industry and its requirements.
  • Our global network ensures we are there wherever and whenever you need us
  • We have the expertise and the tools to provide optimum support and advice.

Your benefits

  • Reliable monitoring

    Of the brake function and wear with just one measurement system.
  • Individual planning

    Of the wear-based maintenance intervals because the /DUE diagnostic unit continuously determines the brake's working air gap.
  • Just one purchase

    Because the measurement system itself works contactlessly and without wear.


  • Two digital output signals (DC 24 V):
    • 1 digital output with NO contact function as function monitoring for the brake: Determining the correct brake function (brake released/applied)
    • 1 digital output with NC contact function as wear monitoring for the brake:
      Determining the maximum wear limit for the brake (working air gap OK/too large)
  • A current signal that is proportional to the air gap (4 to max. 20 mA).
  • Sensor is integrated into the coil body
  • LEDs in the evaluation unit indicate the status of the digital outputs
  • Evaluation unit (electronics) is always installed in the terminal box and has the IP degree of protection of the overall drive
  • Sensors with the IP66 degree of protection so the drive can be offered with an overall degree of protection of IP66
  • Determining the wear on the brake lining and the brake function is contactless and wear-free
  • The /DUE diagnostic unit option comes fully assembled and calibrated in the brakemotor
  • DIP switch for setting the sensor size and the maximum permitted wear limit for optimal adjustment to the application in combination with condition monitoring
  • If the brake disk is changed or the air gap is reset in case of wear, no new calibration of the eddy current sensor is required because the sensor's installation environment does not change
  • Shortening the connection cable between the evaluation electronics and the sensor later, or replacing the sensor, electronics, evaluation electronics, magnet body or pressure plate, always requires calibration of the evaluation electronics
  • Connection variants
    • Directly via the cage clamp
    • Connection via the M12 connector (4 or 8 pins) is in preparation
  • The diagnostic unit can be retrofitted (in preparation; please contact us)
  • The evaluation unit is available in two versions:
    • DUE-1K: Single-channel version for BE.. brakes
    • DUE-2K: Dual-channel version for BF../BT.. brakes
  • The dual-channel version has a digital output for brake function and for wear on the brake lining for each partial brake, as well as an analog current signal

Technical data

The following tables list the technical data of the diagnostic units for installation in the motor wiring space and the sensors installed in the coil body.

Close table
Evaluation unit DUE-1K-00
For BE.. brakes
For BF../BT.. brakes
Signal outputs (2 channels) BE.. brake
Out1: 4 – 20 mA
FCT1: DC 24 V (150 mA)
WEAR1: DC 24 V (150 mA)
Partial brake 1 for BF../BT.. brakes
Out1: 4 – 20 mA
FCT1: DC 24 V (150 mA)
WEAR1: DC 24 V (150 mA)

Partial brake 2 for BF../BT.. brakes
Out2: 4 – 20 mA
FCT2: DC 24 V (150 mA)
WEAR2: DC 24 V (150 mA)
Current consumption Max. mA 190 360
  Min. mA 40 80
Supply voltage DC 24 V (± 15%)
Electromagnetic compatibility DIN EN 61800‑3
Operating temperature range for the evaluation unit -40 to +105 °C
Humidity ≤ 90% relative humidity
Degree of protection IP20 (max. IP66 in closed terminal box)
We have stored a table for you here.
Close table
Sensors DUE-d6-00 DUE-d8-00
Degree of protection IP66 IP66
Operating temperature range
of sensor and cable
-50 to +150 °C -50 to +150 °C
We have stored a table for you here.

Motor/brake combination

The /DUE diagnostic unit is available with the proven type DR.. motors, as well as DR.. motors with the new double brake. These combinations are currently implemented.

Close table
Motor type DRN.. BE.. brake type
90S, 90L,
100L, 100LS,
132S, 132M, 132L

BE1, BE2, BE5, BE11
132M, 132L,
160M, 160L,
180M, 180L

160M, 160L,
180M, 180L,
225S, 225M,

BE30, BE32
225S, 225M,
250M, 250ME,
280S, 280M,

BE60, BE62
250M, 250ME,
280S, 280M,
315S, 315M, 315ME, 315L, 315H

BE120, BE122
We have stored a table for you here.

Areas of application

  • Applications that require a mechanical fail-safe brake
  • Logistics conveyor belts of all sizes
  • Lifting applications
  • Applications in which unplanned machine downtime must be prevented
  • Areas of application in which individually planned, wear-based maintenance intervals are implemented
  • Applications with increased requirements for operational reliability
  • Can be used worldwide in all industries

Last visited