Multiquip Portable Generator DCA36SPXU2

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

Positive lead from the multimeter on the DC POSTIVE (+) terminal of the rectifier (Figure 48)

Touch the U, V and W terminals one at a time with the NEGATIVE (–) lead. Each terminal should give a continuity reading.

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.

NOTICE: If the rotating rectifier fails any of the tests as referenced in Figure 48 or Figure 49, replace the rectifier.

Sign off on the rotating rectifier test

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

Place the multimeter test leads across pins 1 and 2 on the ECU auto start module as shown in Figure 73.

Set the multimeter selection dial to the sound position and verify that there is continuity (beep!) between the pin 1 (BLACK/WHITE) and pin 2 (RED) wire leads on the ECU auto start module as referenced in Figure 73.

If the multimeter reads OPEN (no continuity or beep), replace the MPU sensor.

Sign off on the Mpu Continuity Test

NOTICE: Before performing the resistance check, the CN14 connector plug (Figure 53) must be disconnected from the CN4 receptacle on the AVR. If the reading indicates an open circuit or incorrect reading replace the rheostat.

Symptom: AC voltage output is half the normal value and there is no response when adjusting rheostat.

Disconnect the CN14 plug from the CN4 receptacle on the AVR and measure the resistance of the rheostat at the connector plug.

Set the multimeter selection dial to to the W position as shown in Figure 53A.

Place the multimeter leads between pins 1 and 3 on the CN14 connector plug (Figure 53B). Turn the voltage control knob (Figure 53C) fully counterclockwise. The multimeter should read zero ohms (Figure 53D).

Next, turn the knob slowly until the knob is fully clockwise and the multimeter should read about 1000 ohms (Figure 53E).

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 as shown 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: Activating the test button while the unit is running will shunt trip the main circuit breaker. Only perform with no load on the generator