Messages and warnings
Instruction handbook BUM 60 / BUS 60
Document No.: 5.01032.05
Baumüller Nürnberg GmbH
58
8.3
Earth fault monitoring
To detect a motor earth fault the system has a two-phase monitoring of the earth fault current of
the motor-end inverter resp. motor phases. An earth fault current error message is generated if
the fault current exceeds 10 % of the allowed peak current of the power unit. By this two-phase
monitoring the unit is partly earth leakage resistant.
Earth fault monitoring can be reset by a reset signal from the controller.
For display and resetting of the message, refer to the description of the controller.
DC link monitoring
The system monitors the level of the DC Link voltage in the motor-end inverter. A message is
issued if the DC Link voltage reaches a value that is critical for the power unit.
DC Link monitoring can be reset by a reset signal from the controller.
For display and resetting of the message, refer to the description of the controller.
NOTE
The DC Link voltage can rise until switch off if the drive brakes and the ballast power
of the ballast circuit on the DC Link is either too small or no ballast circuit exists.
Monitoring power transistors
The junction region temperature is monitored. The system generates a message if the junction
region temperature exceeds 110 °C.
This message can be reset by a reset signal from the controller.
For display and resetting of the message, refer to the description of the controller.
Monitoring the auxiliary voltage supply
The system monitors the auxiliary voltage supply of the power unit and issues a message if an
undervoltage occurs.
This message can be reset by a reset signal from the controller.
For display and resetting of the message, refer to the description of the controller.
Monitoring the heatsink temperature
The power unit does not have its own temperature monitoring facility, since the temperature of
the heatsink is not a time-critical variable.
On the heatsink, there is a linear temperature sensor whose measured value is passed on to
the controller. This means that the controller carries out temperature monitoring (refer to the de-
scription of the controller).
