Siemens SINUMERIK 840D sl Series Diagnostics Manual page 706

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Overview of Alarms

<location>Drive: Brake control defective

OFF1 (NONE, OFF2, OFF3)

Acknowledge:

The control unit has detected a brake control fault.

- no motor holding brake connected.

- the motor holding brake control on the motor module is faulty.

- a DRIVE-CLiQ communications error has occurred between the control unit and the

motor module involved.

Fault value (r0949, decimal):

10: No brake connected or fault in the motor module brake control circuit ("open brake"

11: Defect in the brake control circuit of the motor module ("brake open" operation).

20: Short-circuit in the brake winding or fault in the brake control circuit of the motor module

("brake open" state).

30: No brake connected, short-circuit in the brake winding or fault in the motor module

brake control circuit ("close brake" operation).

31: Defect in the brake control circuit of the motor module ("close brake" operation).

40: Defect in the brake control circuit of the motor module ("brake closed" state).

50: Defect in the brake control circuit of the motor module or communications fault between

the control unit and the motor module (brake control diagnostics).

- check the motor holding brake connection.

- check the function of the motor holding brake.

- check whether there is a DRIVE-CLiQ communications error between the control unit and

the motor module involved and if required, carry-out a diagnostics routine for the faults

- check the electrical cabinet design and cable routing for EMC compliance

- replace the motor module involved.

<location>Brake does not open

Acknowledge:

This alarm is output for r1229.4 = 1.

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