Trips and Fault Finding 7-25
DC590+ DRV Series DC Digital Drive
Field Fail Procedure
If the motor field supply fails while the drive is running a motor, the drive should trip on either an OVERSPEED alarm or a FIELD FAILED alarm.
Field volts missing
from motor
Check external field
supply jumper positions
(see Chapter 3)
OK
Is the field supply
connected to terminal
FL1 and FL2?
Yes
No
Connect wiring
Are all wires and
terminals connected
and tight?
Yes
No
Tighten wiring
Is field supply voltage
present at terminals
FL1 and FL2?
Yes
No
Is field supply voltage
present at drive
terminals D1 and D2
Yes
No
Disconnect all power!
Yes
No
Bad 590+ DRV Chassis
Check continuity between
terminals FL2 and D2
No
Bad 590+ DRV Chassis
Stack bad;
D1 terminals block or
tracking broken
NOTE: The wires connected to terminals
FL1 and FL2 must be in phase with
L1 and L2 respectively
Check field supply
wiring and protection
Check continuity between
terminals FL1 and D1
Figure 7-3 Field Power Troubleshooting Flowchart
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