Hobart GPU-600 Series, Operation And Maintenance Manual

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OM-2244 / Operation and Maintenance Manual
DCS-600/ Series 500082 / Solid State Transformer-Rectifiers
December 15, 2014 Chapter 2-1
Page 5
If no Oscilloscope is available: Remove all six service fuses next to the A1 PC board. Keep in mind during
this test only one fuse at a time will be placed in the holder with the with fuses other removed.
CAUTION

The input power switch should be off whilst removing and installing
each fuse for this Test
Systematically
put only one fuse in it’s holder at a time and turn the input power switch on and see if 28.5VDC
Is indicated on the Ground Power Unit Voltmeter. If voltage is present at the voltmeter then that particular
SCR(Diode) is good. Continue putting one Fuse at a time in it’s holder to check if the 28.5 VDC is present at
the voltmeter , do this until all six fuse holders (SCR) have been checked. If a particular fuse placed in its
holder (again no other fuses installed) does not indicate 28.5 VDC the SCR or that circuit has failed.
6) Troubleshooting Tables
Trouble, Symptom, Condition Probable Cause Test, Check, and/or Remedy
Machine Will Not Operate
1. Machine will not start a. The input power is turned OFF
at remote disconnect switch Turn the power ON at remote
disconnect switch.
b. Blown fuse in remote disconnect
switch Replace blown fuse. If fuse blows
frequently, determine and remedy
the cause.
c. Incorrect input power
connections at machine Check input power connections
against appropriate connection
diagram in Chapter 5.
d. Incorrect power input (frequency
and voltage) Check that voltage and frequency
of power input for this ground
power unit, according to the rating
on its nameplate.
e. Broken input cable Repair cable as necessary.
2. Line contactor fails to close a. Line contactor fuse F8 blown
Replace fuse. Check for cause if
fuse blows frequently.
b. Mechanical obstruction on
contactor Remove obstruction.
c. Defective line contactor switch Replace line contactor switch.
d. Defective coil in line contactor
Replace contactor if coil is open or
shorted.
e. Cable broken at line contactor Repair broken cable as necessary.