Operating instructions

Commissioning

Feed/Feed-Back Units BUC 624, 625 45

Baumüller Nürnberg GmbH 5.96024.06a

y DC link Monitoring

The level of the DC link voltage is monitored in the BUC. The system generates a message if the DC

link voltage exceeds 840 V. The internal and external Ready for use are disabled.

The response of the DC link monitoring is indicated by the red LED "U

>" and can be reset by

means of an external reset.

y Monitoring the Switching Conditions of Power Transistors

For the duration of the power transistors' switch-on command, the system monitors the collector-

emitter saturation voltage. If too high a saturation voltage is detected in conducting status, overcur

rent of the power transistor is present; this can be due to a short circuit of the motor terminals, for

example, and a controlled shutdown is being carried out that switches off the transistor and gener

ates a message (red LED "Trans."). In addition can be evaluated about the LED's "MU+", "MU-",

"MV+", "MV-", "MW+" and "MW-" which transistor has produced the message.

This message can be reset by means of an external reset.

Announcement and resetting the message see description of the controller.

y Monitoring the Auxiliary Voltage Supply

The system monitors the auxiliary voltage supply of the power unit and issues a message if an und-

ervoltage occurs. The internal and external Ready for use are disabled.

This message is indicated by the LED "FAG" and can be reset by means of an external reset.

y Mains and Phase Failure Monitoring

This monitoring facility prevents an internal and external Ready for use if at least one phase of the

mains supply is missing; in addition, a pulse disable is generated in the BUC. If the DC link voltage

falls below 500 VDC, the system displays the alert message (X99 AB : 3,4 relay contact open). When

the charging circuit is activated, auxiliary contact X1:4,5 is open with the enable for the main contac

tor being inactive.

With power failure there shines the yellow LED " Netz aus " so long no mains exists.

With phase failure and with left rotating field the yellow LED " Netz aus " flashes while phase failure

error/left rotating field error is present at the terminals.

The system does not save this message.

y Temperature Monitoring

In the case of an overload, i.e. the heat sink temperature is above 90° C, the LED "Temp>" indicates

"overtemperature" and the controller sets the Alert message ( X99 AB : 3,4 relay contact open).

After ten seconds, the system saves tripping of the monitoring and prevents internal and external

Ready for use.

When a warning is issued, this makes it possible to place the machine in a defined operating state

before the drive prevents Ready for use and shuts down.

This message can be reset by means of an external reset.

NOTE

To ensure recovery of the transistor after switch-off due to overcurrent, the message cannot be

cleared for at least five (or typically ten) seconds.