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Revision 8.6
SECTION 6 : OPERATION OF CONTROL PANEL
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wires around and check if the unbalance current follows the wire change or remains at its
original place. Remaining at the same phase indicates that the fault is in the Control Card
and this card needs to be replaced.
6.8.3
Loss of phase
A loss of phase fault indicates that a stator phase current was at 0 Amps while the system was
running.
Note: This is not indicative of a fault on the 3 phase supply system; such fault will be registered as an
“INPUT PHASES” fault instead.
6.8.3. (a)
loss of phase 1
The loss of stator current occurred on C.T. input 1
6.8.3 (b)
loss of phase 2
The loss of stator phase current occurred on C.T. input 2.
6.8.3 (c)
loss of phase 3
The loss of stator phase current occurred on C.T. input 3.
Possible causes
The possible causes of this fault are similar to the ones described under Current Unbalance Fault
(refer to 6.8.2)
6.8.4.
Current Feedback
A Current feedback fault indicates that all 3 stator current readings (CT1, CT2 and CT3) are at 0 Amps
during operations.
For Hoist applications it is essential to monitor all 3 stator currents to ensure efficient and safe motor
operations.
For Travel ap
plications the current monitoring maybe disabled by means of the parameter “CT
enabled” being change to false.
Possible causes
The current feedback connector (CT inputs connector) has not been plugged into the unit
properly.
The Ct inputs common wire is not connected properly (green wire, GND).
External C.T. wiring faulty
Directional contactors failed to energise. This is more likely to give a “RFB & CURRT LOSS”
fault message.
Faulty stator cable
