7-26 Trips and Fault Finding
DC590+ DRV Series DC Digital Drive
Contactor Failed Procedure
This flowchart is used for troubleshooting problems associated with the main contactor, AM, including wiring. Refer to the schematic/wiring diagrams
in Chapter 3 when troubleshooting.
Figure 7-4 Troubleshooting Flowchart for Faulty DC Contactor
Is the main contactor
energised?
Possible bad stack;
replace stack.
Is +10 VDC measured
at terminal A5?
(Current Limit OK?)
Is +24 VDC measured
at terminal C5
(Enable)?
Is wire from terminal
C9 to Aux. contact
terminal on contactor
Bad DRV Chassis
Possible bad contact;
replace contactor.
Possible missing wire;
install jumper between
terminals B3 and A6.
Measure continuity of
wire from D5 to
contactor.
Measure continuity of
wire from D6 to
contactor.
Disconnect all
power!
Is 120 VAC present at
D5 and D6?
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