32 Introduction and Technical Data
3.6 Supply loss shutdown
There are 3 supply ports to the unit.
Port 1) Control supply. 1ph. Provides power for the internal control electronics.
Port 2) EL1/2/3 Auxiliary supply 3ph. Provides power for the field and is used for synchronisation.
Port 3) L1/2/3 Main supply 3ph. Provides po wer for the armature bridge.
A loss of any line on port 3, will be recognised by the missing pulse detector.
A loss of any line on port 2, will be recognised by either field loss (EL3), phase loss (EL1/2), or
synchronisation loss (EL1/2) detectors. (Note. Ports 2 and 3 are ultimately fed from the same supply,
although via different fuses, or step up/down transformers).
Hence a supply loss may simultaneously be recognised by port 2 and port 3.
A total supply loss to the installation will occur on all 3 ports simultaneously.
See 8.1.11 MOTOR DRIVE ALARMS / DRIVE TRIP MESS A GE.
A loss on port 1 will be recognised belo w approx. 80V A C.
See also 9.1.10 SELF TEST MESSA GE / Internal error code, for details of dips on port 1.
Effects of supply loss or dips.
The armature and field current will phase back to zero, the contactor control will de-energise. Any valid trip
message is permanently saved. See also 5.1.2 PARA METER SA VE.
In the case of a supply dip, the message INTERNAL ERROR C ODE / SUPPLY PHA SE LOSS will appear on the
display to indicate that a supply DIP has occurred. Press the left key to reset. This message may be briefly
visible at normal control supply turn off.
See 8.1.11.11 DRIVE TRIP MESSAGE / Supply phase loss, for details on ride through times.
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