Multiquip Portable Generator DCA125SSIU4F

Warning: Only perform this test with no load on the generator.

Place the selection dial on the multimeter to the W position, then select the sound icon.

With the engine OFF and no power applied to the relay, place the multimeter leads across terminals 95 and 96 on the relay and verify that there is continuity. This implies a CLOSED circuit, continuity.

PRESS the spring-loaded relay reset button.

Move the multimeter leads to terminals 97 and 98 on the relay and verify that there is no continuity. This implies an OPEN circuit, no continuity.

To trip the OCR, slide the manual trip lever on the relay and verify that the multimeter indicates an OPEN circuit across terminals 95 and 96. This implies an OPEN circuit, no continuity.

Move the multimeter leads to terminals 97 and 98 on the relay and verify that there is continuity. This implies a CLOSED circuit, continuity.

NOTICE: Before performing the resistance test, the three yellow lead wires (Figure 37) must be disconnected from the rotating rectifier. If the reading indicates an open circuit the component may have to be replaced or repaired.

The exciter armature (Figure 37) consists of three yellow lead wires with no wire designation. These three wire leads are connected to the U, V and W terminals on the rotating rectifier.

Are the three yellow lead wires disconnected from the rotating rectifier?

Upload a photo of the disconnected wires

Enter the resistance reading across each pair of wires as referenced in Table 6, column C.

Is the multimeter selection dial on the Ω position?

Sign off on the Exciter Armature Resistance Test

NOTICE: Before performing the continuity test, all lead wires (Figure 48) must be disconnected from the rectifier.

The rotating rectifier is connected to both the main field and exciter armature and is mounted on the exciter stator armature.

Selection dial on the multimeter in the diode position

Place the positive lead from the multimeter on the DC POSTIVE (+) terminal of the rectifier (Figure 48). Now touch the U, V and W terminals one at a time with the NEGATIVE (–) lead. Each terminal should give a continuity reading.

Continuity reading for U terminal

Continuity reading for V terminal

Continuity reading for W terminal

Reverse the multimeter leads. Place the NEGATIVE lead of the multimeter on the DC Positive (+) terminal of the rectifier (Figure 49) and touch U, V and W terminals with the positive lead. This should cause the multimeter to read open circuit.

Open circuit reading for U terminal

NOTICE: The GFCI receptacle is designed to interrupt power when a ground fault exists to prevent injuries and shock hazards. DO NOT use the GFCI receptacle if the test below fails. Consult a qualified electrician for repair or replacement of the GFCI receptacle. Test the GFCI receptacle at least once a month.

Start the generator as outlined in the start-up procedure in this manual.

Place a GFCI circuit breaker (Figure 63) in the ON position.

Verify that the status LED on the corresponding GFCI receptacle (Figure 63) is ON (GREEN).

Press the TEST button (Figure 65) on the GFCI receptacle and verify that the status LED turns OFF.

Press the RESET button (Figure 66) to restore power to the GFCI receptacle and verify that the status LED is ON (GREEN).

If the status LED (Figure 67) is flashing (RED), DO NOT use the GFCI receptacle and replace it immediately.

Sign off on the GFCI Method Test

Warning: This inspection requires trained personnel with PPE!

Visual inspection of generator for environmental factors

Inspection of electrical connections for rust, corrosion, and oxidation

Check for carbon flash deposits around the 120/240V AC receptacles

Signs of wire overheating (discoloration and a burnt smell)

Check for infestation inside the generator

Check terminal lugs/bus bars for secure tightening

Check electrical connectors for good connection