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 6
3. Line contactor chatters a. Input cables too small or too
long Use input cables of sufficient
capability for proper operation of
the machine. Refer to Section 1-2,
Figure 1 for proper cable size to be
used.
b. Faulty contactor coil Check coil voltage. If correct,
replace contactor.
c. Low line voltage Check line voltage. Correct
problem as necessary.
Trouble, Symptom, Condition Probable Cause Test, Check, and/or Remedy
Machine Will Not Operate, continued
4. Contactor operates and trips
power source circuit breaker or
blows fuses a. Wrong line voltage Check nameplate of machine for
line voltage to be used. Then
measure line voltage. If line voltage
is of improper value, correct this
condition as is necessary to
provide proper voltage input to the
machine.
b. Breaker incorrect size or type or
fuse Refer to Section 1-2, Figure 1 for
input current requirements. Make
sure the breaker is appropriate for
a high inrush current
– use a
breaker designed for motor starting
applications.
c. Links on voltage changeover
board incorrectly connected Check appropriate voltage
changeover diagram in Chapter 5
for proper link positions. Make
correction as necessary.
d. SCR failure or shorted fly-back
diode Refer to detail troubleshooting
instructions.
e. Short circuit in primary
connections
Remove short circuit.
Trouble, Symptom, Condition Probable Cause Test, Check, and/or Remedy
Unit Turns Off After Starting
1. Unit delivers power but soon
shuts down (Thermal overload,
electronic overload or over-
voltage circuit trips) a. Power supply overloaded Reduce load, overload can be
carried only for a short time.
b. Duty cycle too high Do not operate continually at
overload currents.