8-2 Routine Maintenance and Repair
590 Series DC Digital Converter
Technical Support Checks
The results of the following checks will be very useful to Parker SSD Drives’ Technical
Support.
Caution
Please only attempt these checks if you are electrically competent.
Miscellaneous Checks or
Check 24V present at Terminals C1 to C9 (C1 is 0V) - dc
Check ±10V present at Terminals B3 and B4 (B1 is 0V) - dc
Check auxiliary supply present at Terminals D7 (neutral) & D8 (line), 110/240V ac
Check the fans rotate, where applicable
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
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 or
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.
or
-ve to L1 & +ve to D3 = Diode Drop (approximately 0.5V)
-ve to L2 & +ve to D3 = Diode Drop (approximately 0.5V)
-ve to D4 & +ve to D3 = Diode Drop (approximately 0.5V)
-ve to L1 & +ve to D4 = Open Circuit
-ve to L2 & +ve to D4 = Open Circuit
External Field Check Using a Meter or
-ve to D1 & +ve to D3 = Diode Drop (approximately 0.5V)
-ve to D2 & +ve to D3 = Diode Drop (approximately 0.5V)
-ve to D4 & +ve to D3 = Diode Drop (approximately 0.5V)
-ve to D1 & +ve to D4 = Open Circuit
-ve to D2 & +ve to D4 = Open Circuit
Make a note of the Serial No. and Model No.
Serial No. Model No.
Re-establish all connections. All terminals should be secure and not over-torqued.
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