Siemens Industry Online Support
Siemens AG
Entry type: FAQ Entry ID: 25843238, Entry date: 11/05/2008

AC-Drive Blocksize with Brake Relay, brake does not open.

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For an AC-Drive with Brake Relay (not Safe Brake Relay!), the brake cannot be controlled, i.e. it does not open.

The setting of p1278 must be checked. In this case, a value of 1 must be entered for the above mentioned case. The brake can now be controlled.
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