Parker 590+ series - Continuity Test on Fuses Using a Meter; Diode Check on Power Terminals Using a Meter; Internal Field Check Using a Meter; External Field Check Using a Meter

8-4 Routine Maintenance and Repair
DC590+ Series DC Digital Drive
WARNING
Now isolate the unit completely from all supplies. It may be necessary to remove an armature and field
connection to carry out the following checks.
Continuity Test on Fuses Using a Meter
9or 8
Check the coding fuses on the power board
Check the auxiliary fuses etc. (fan fuse, if applicable)
Diode Check on Power Terminals Using a Meter
9or 8
A+ to L1, L2, L3 and Earth Terminal = Open Circuit
A- to L1, L2, L3 and Earth Terminal = Open Circuit
Internal Field Check Using a Meter
All the coding fuses must be OK before continuing with the following checks since the fuses are in the circuit.
9or 8
-ve to L1 & +ve to F+ = Diode Drop (approximately 0.5V)
-ve to L2 & +ve to F+ = Diode Drop (approximately 0.5V)
-ve to F- & +ve to F+ = Diode Drop (approximately 0.5V)
-ve to L1 & +ve to F- = Open Circuit
-ve to L2 & +ve to F- = Open Circuit
External Field Check Using a Meter
9or 8
-ve to FL1 & +ve to F+ = Diode Drop (approximately 0.5V)
-ve to FL2 & +ve to F+ = Diode Drop (approximately 0.5V)
-ve to F- & +ve to F+ = Diode Drop (approximately 0.5V)
-ve to FL1 & +ve to F- = Open Circuit
-ve to FL2 & +ve to F- = Open Circuit
Make a note of the Serial Number and Model Number.
Serial Number Model Number
Re-establish all connections. All terminals should be secure and not over-torqued.