Lenze E94ARNE Regenerative power supply - Manual (Page 25)

EDS94ARNExxxx EN 2.3 - 06/2014
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25
9400 regenerative power supply module | Parameter setting
Regenerative power supply module application
Parameterising the brake chopper/brake resistor
3.1.3 Monitoring
3.1.3.1 Overcurrent protection
The brake chopper hardware is monitored for overcurrent (short circuit or earth fault).
 If the monitoring function responds:
– The brake chopper is switched off immediately.
– The "Fault" response that is set fixedly is activated.
– The "Brake transistor: overcurrent" error message is entered in the logbook of the
regenerative power supply module.

Tip!
In addition to the overcurrent protection, the regenerative power supply module is
provided with two more monitoring modes for braking operation, which are active
even if no brake resistor is connected (testing mode for checking the parameter
setting):
 Ixt utilisation of brake transistor
( 26)

I2t utilisation of brake resistor
( 27)

Note!
Monitoring for overcurrent can only be activated if a real brake current flows. A
test in idle state (without a brake resistor connected) is not possible.

Note!
The error can only be acknowledged after 2 seconds at the earliest to resume the
braking operation.