Retest After Repair - Lincoln Electric GENUINE SAE-300 Service Manual

RETEST AFTER REPAIR

F-85 F-85
Retest after repair
The machine should be retested if any parts are replaced that could affect the machine's
electrical characteristics.
Engine output:
Perform the Engine RPM Adjustment Test
Welder DC Output:
Maximum Output:
Bring the machine to normal temperature by connecting a load bank and operating the
machine at 100% output (250 amps @ 30 volts) for about 30 minutes.
Remove the load and set the output control and job selector rheostat to the maximum posi-
tion.
IMPORTANT: Do not move the output control while a load is applied to the weld output
terminals. Damage to the output control unit may result.
Read the open circuit voltage (OCV) at the weld output terminals. The voltage should mea-
sure 94 to 99 DC Volts.
Set the coarse and fine current controls to maximum and apply a 300 Amp load to the
machine using the resistive load bank. Check the engine RPM and weld terminal voltage.
The Engine RPM should be 1650 to 1750
The weld output volts should be 36 to 46 VDC.
AC Auxiliary Output:
Machine should be operating at normal operating temperature.
Place the idle switch in the high idle position.
230 Volt receptacles should read 240 to 254 AC volts.
115 Volt receptacles should read 118 to 130 AC Volts.
Field amps and volts:
Place the fine current / O.C.V. rheostat to Maximum. (The machine should still be at normal
operating temperature.)
Exciter volts, Measured at slip rings: 123 to 133 DC Volts
Exciter rotor amps: 2.2 to 2.6
Shunt field amps: 1.9 to 2.4
(Measure the Shunt Field current at either the blue or brown wires between the generator and
the J5 Molex connector. See Wiring Diagram.)
SAE-300 ®