7-18 Trips and Fault Finding
DC590+ DRV Series DC Digital Drive
Trip Message and Meaning Possible Reason for Trip Corrective Action
Open circuit motor field Check connection and measure field resistance
Faulty operation of field controller Where an ac supply feeds the onboard field regulator,
check connections FL1 & FL2 for line-to-line voltage
(rather than line-to-neutral) - L1 into FL1, L2 into FL2.
The 3-phase supply must be present for mains
synchronisation purposes
FIELD FAIL
Field current is less than 6% of rated
current when in Current Control
mode
Field current is less than 50mA when
in Voltage Control mode (with default
current burden of 15K)
Alarm time delay : 1 second
Refer to
Field Fail Procedure, page 7-
25
No field supply required For loads where no field supply is required, e.g. a
permanent magnet motor, set the FIELD ENABLE
parameter to disable to suspend this alarm.
Mains voltage incorrect Check the mains voltage of the drive (refer to Product
Code). This alarm may not operate properly if the
voltage is incorrect, i.e. wrong unit or drive
Supply voltage low or missing Check auxiliary/control or main supply power
Blown fuse Check external branch circuit protection.
Check auxiliary/control fuse F1
Check that armature current calibration does not exceed
drive rating
Loose wiring. AC contactor not
engaging
Check all power wiring for tightness
3-PHASE FAILED
3-phase supply failure
Defective power supply pcb Replace power supply pcb
One or more phase of supply low,
too high or missing
Check all three phases of the supply, other equipment
on the same supply may be unbalancing the phases.
Check fuses F1, F2, F3, FS4, FS5 and FS6
Supply waveform badly distorted Install line chokes and/or isolation transformers if not
present with drive
Power supply pcb or control door
defective
Replace the power supply board
PHASE LOCK
Drive SCR firing phase lock loop
unable to lock to supply waveform
Supply frequency outside 46-65Hz
range
Change supply for one within the 45 to 65Hz range
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