Pulse frequencies of the brakes

In the case of brakes operated with AC voltage, make sure the connection type designated by the manufacturer is applied correctly during the brake connection. The following types are distinguished:

  • Cut-off in the AC circuit (AC cut-off) with normal application time
  • Cut-off in the AC circuit and the DC circuit (AC/DC cut-off) with shortened application time

The correct shutdown method must be ensured through appropriate wiring. Certain brake controls by SEW‑EURODRIVE implement the cut-off in the DC or AC circuit via integrated switching relays (e.g. BMP1.5).

To prevent delayed brake application or unintentional ongoing brake release, you must observe the following:

  • During project planning, consider the required cut-off type and the effects on the expected stopping distance in particular.
  • Only use the faster cut-off in the DC and AC circuit for hoists and hoist-like applications.
  • If it is unclear whether the application is a hoist-like application, contact SEW‑EURODRIVE.
  • Make sure that the configured connection type (AC or AC/DC) is implemented correctly during startup, regardless of the type of application.

The connection type is specified on the included wiring diagrams by a pictogram.

For brakes operated with a DC voltage, a cut-off only in the DC circuit (DC shutdown) is always performed due to the operating principle. With regard to the application time, this is equivalent to the cut-off in the AC/DC shutdown mentioned above.

The selected shutdown method must be taken into account during dimensioning in equations 1.2 and 1.18 by means of parameter t2.