Baumuller BUM 62, Operating Instructions Manual

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Commissioning
58
Mono Power Unit BUM 62, 63, 64
5.94005.12
Baumüller Nürnberg GmbH
6.6 Monitoring motor-end power unit
To use the monitoring the +24 V power supply (X99A or X99B) must be available.
Following features are monitored:
– Overcurrent in the motor cables
– Earth-fault current
– DC link voltage
– Power transistors switching status
y Overcurrent message
Motor current in the motor phases is monitored, and on exceeding phase current by 30 % of the per-
mitted peak current, an overcurrent message is generated. This error message is saved and a pulse
inhibit is made.
The overcurrent message can be reset by a controller reset.
For display and message resetting, see controller description
y Earth-fault monitoring
The earth fault current of the power unit, and thus the motor phase, is monitored for earth faults. An
earth fault message is generated if the fault current exceeds 20 % (BUM 62) or 10 % (BUM 63/64)
of the power unit's peak current.
Earth-fault monitoring can be reset by a controller reset.
For display and message resetting, see controller description.
y DC link monitoring
The amount of the DC link voltage is monitored in the power unit. If it reaches 800 V an error mes-
sage is generated.
DC link monitoring can be reset by a controller reset. For display and message resetting, see con-
troller description.
y Power transistors switching status monitoring
During the power transistor switch-on command, the collector-emitter saturation voltage is moni-
tored. If a too-high saturation voltage is detected in a conductive state, overcurrent of the power tran-
NOTE
The overcurrent message should be seen as protection, and limitation of the permitted peak of the
motor phase currents is determined by the controller.
NOTE
The intermediate circuit voltage can rise until it is shut off if the drive brakes and no, or too little,
ballast switching is available in the intermediate circuit.