10-12.Checking Unit Output After Servicing - Red-D-Arc D502K 5+4 Technical Manual

10-12. Checking Unit Output After Servicing
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2
Pre-Operational Checks
Wipe engine surfaces clean.
Check labels; replace labels that are unreadable or damaged.
Check fuel and oil (see Section 4-5).
Check and correct any fluid leaks.
Clean weld output and battery terminals. Tighten connections.
Clean outside of entire unit.
D502K 5+4
Y Stop engine before adjusting resistor R3.
Start engine and check engine
speed. Adjust engine speed if nec-
essary (see Section 7-5).
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2
Turn
control R1 to max. Place Process/
Contactor Control switch S6 in
Weld Terminals Always On – CC
Stick position.
Check voltage at each receptacle.
With no load applied, there should
be 126 to 130 volts ac present at
GFCI1 and 252 to 260 volts ac at
RC1.
If correct voltage is not present,
stop engine and reconnect lead 102
and/or lead 106 to different taps on
R3.
.
Start engine and check GFCI1 and
RC1 voltage. If necessary, change
R3 connections until correct volt-
age is obtained at receptacles with-
out exceeding 4.6 amperes dc ex-
citer revolving field current (see
Section 10-2).
Check open-circuit voltage across
weld output
should be 90 volts dc present. If
correct voltages are not present, re-
peat troubleshooting procedures in
Section 10-1.
Y Stop engine.
Allow engine to cool, and then com-
plete pre-operational checks in
table.
Test Equipment Needed:
Duplex Receptacles GFCI1
And RC1
Resistor R3
Voltage/Amperage Adjust
Connect R3 so at least half of
resistor length is in circuit.
terminals. There
Tools Needed:
803 210 / 803 201
TM-4412 Page 51