Siemens 420 manual 121

Issue 07/04 3 Functions

NOTE

Motors have optional holding brakes which are not designed to be used as brakes for normal operation. The holding brakes are only designed for a limited number of emergency braking operations / motor revolutions with the brake closed (refer to the Catalog data).

When commissioning a drive with integrated holding brake it is therefore absolutely imperative that it is ensured that the holding brake functions perfectly. A "clicking noise" in the motor indicates that the brake has been correctly released.

WARNING

It is not sufficient to select the status signal r0052 bit 12 "Motor holding brake active" in P0731 – P0733. In order to activate the motor holding brake, in addition, parameter P1215 must also be set to 1.

If MICROMASTER controls the motor holding brake, then a series commissioning (refer to Section 3.5.6) may not be carried-out for potentially hazardous loads (e.g. suspended loads for crane applications) unless the load has been secured. Potentially hazardous loads can be secured as follows before series commissioning is started:

♦Lower the load to the floor, or

♦Clamp the load using the motor holding brake

(Caution: During the series commissioning, MICROMASTER must be prevented from controlling the motor holding brake).

MICROMASTER 420	Operating Instructions
6SE6400-5AA00-0BP0	121