Multiquip Portable Generator DCA70SSIU4F

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).

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.

Is the selection dial on the multimeter in the diode position?

Did you place the positive lead from the multimeter on the DC POSTIVE (+) terminal of the rectifier (Figure 48)?

Did you touch the U, V and W terminals one at a time with the NEGATIVE (–) lead?

Did each terminal give a continuity reading?

Did you reverse the multimeter leads?

Did you place the NEGATIVE lead of the multimeter on the DC Positive (+) terminal of the rectifier (Figure 49)?

Did you touch U, V and W terminals with the positive lead?

Cable ends, wire connectors and terminals, tighten and repair as needed

Generator end for signs of heat discoloration

Panel controls and breakers for signs of heat discoloration and that they are securely mounted

All gauges for proper operation during test run

Frequency and voltage, adjust as necessary

Sign off on the generator inspection

MANUAL EXCITATION TEST (3-PHASE VOLTAGE):

1. With the engine OFF, place the voltage selector switch (Figure 39A) in the 3-Phase, 240/139V position.

2. Unplug the 6-pin plug from the CN1 receptacle on the AVR (Figure 39B).

3. Connect a SPST toggle switch (Figure 39C) between the positive battery terminal and pin J on the 6-pin plug.

4. Connect a wire from the negative battery terminal to pin K on the 6-pin plug (Figure 39D).

5. Place toggle switch in the OFF (open) position, if equipped set engine speed switch to the low position (idle). Start the engine and then place toggle switch in ON position (closed).

6. Next, place engine speed switch in the high position and run the engine at full rpm.

7. Place the selection dial on the multimeter to the AC volts position (Figure 39E).

8. Using; a multimeter, measure voltage at the U, V and W terminals (Figure 39F) located on top of the main circuit breaker (line side).

NOTICE: Before performing the continuity check, both surge protector lead wires (Figure 50) must be disconnected from the rotating rectifier.

Surge protector lead wires disconnected from the rotating rectifier?

Place the selection dial on the multimeter in the Ω position.

Selection dial on the multimeter placed in the Ω position?

Next, place the multimeter leads across the surge protector as shown in Figure 50 and verify that the meter displays an open circuit.

Multimeter leads placed across the surge protector and meter displays an open circuit?

If the meter indicates continuity or another reading, replace the surge protector.

Does the meter indicate continuity or another reading?

Surge protector replaced if necessary?