Lenze E94AxPExxxx - Manual (Page 311)

Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06
311
8 Braking operation
8.2 Monitoring
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8.2 Monitoring
8.2.1 Overcurrent protection
The brake chopper hardware is monitored with regard to overcurrent (short circuit or earth fault).
• If monitoring responds:
• The brake chopper is switched off immediately.
• The "Fault" response is activated.
• The "Brake transistor: overcurrent" error message is entered into the logbook of the
controller.

Tip!
In addition to the overcurrent protection the controller is provided with two further
monitoring functions for the braking operation, which are also activated if no brake resistor
is connected at all (testing mode for checking the parameterisation):
 Ixt utilisation - brake transistor ( 312)
 I2t utilisation - brake resistor ( 313)

Note!
The monitoring with regard to overcurrent can only be triggered if a braking current is
actually available. It is not possible to carry out a test in idle state (without connected
brake resistor).

Note!
The error can only be acknowledged after 2 seconds at the earliest to resume the braking
operation.