Trips and Fault Finding 7-15
DC590+ Series DC Digital Drive
Trip Message and Meaning Possible Reason for Trip
ENCODER FAILED
No speed feedback signal
The SPEED FBK SELECT parameter is set to ENCODER but an optional Encoder
board is not fitted
Where applicable, check fibre optic cable for damage, bend radius, operating
length - refer to the Microtach handbook.
Check cable and connections on wire-ended encoder
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)
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.
Note that the 3-phase supply must be present for mains synchronisation purposes.
For loads where no field supply is required, e.g. a permanent magnet motor, set
the FIELD ENABLE parameter to DISABLED to suspend this alarm.
Alarm time delay : 1 second
3-PHASE FAILED
3-phase supply failure
Total failure of supply, or missing phase of 3-phase supply (detected under most
circumstances) - check supply to the controller, check high-speed thyristor stack
protection fuses, check power chassis coding fuses.
Check the mains voltage of the Drive (refer to the Product Code). This alarm may
not operate properly with controller if the voltage is incorrect, i.e. wrong unit or
controller.
PHASE LOCK
Supply frequency is outside the frequency band limits
45 - 65Hz
Check supply frequency
Synchronisation errors caused by distorted supply
5703 RCV ERROR
Invalid data received via P3 port from another Drive
(Alarm only operates when MODE parameter is set to 5703 SLAVE)
STALL TRIP
With motor stationary (AT ZERO SPEED parameter
shows TRUE), current has exceeded the STALL
THRESHOLD parameter value for longer than the
STALL TRIP DELAY parameter value
(Alarm only operates when the STALL TRIP parameter is enabled).
OVER I TRIP
Current feedback value has exceeded 280% of rated
current
(300% loading not exceeding 15ms or 325% not exceeding 6.6ms is acceptable)
Motor armature windings failure - check insulation resistance.
Badly tuned current loop
Faulty Drive - refer to Parker SSD Drives
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