Multiquip Portable Generator DCA10SPXU4

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 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.

Multimeter leads placed across the surge protector?

Verify that the meter displays an open circuit.

Meter displays an open circuit?

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

Engine OFF and voltage selector switch in the 3-Phase, 240/139V position

6-pin plug unplugged from the CN1 receptacle on the AVR

SPST toggle switch connected between the positive battery terminal and pin J on the 6-pin plug

Wire connected from the negative battery terminal to pin K on the 6-pin plug

Toggle switch in the OFF (open) position, engine speed switch set to the low position (idle), engine started and toggle switch placed in ON position (closed)

Engine speed switch in the high position and engine running at full rpm

Selection dial on the multimeter set to the AC volts position

Voltage measured at the U, V and W terminals located on top of the main circuit breaker (line side)

NOTICE: Be sure you have adjusted the engine crank disconnect potentiometer first.

Turn the engine overspeed adjustment potentiometer (Figure 56C) 30 turns clockwise.

Using a small, flat-blade screwdriver, set the DIP switch at position 5 (Figure 56D) to the ON position (up).

Start the engine. It should crank and start. Verify that the engine running LED is lit.

Now start turning the overspeed adjustment potentiometer counterclockwise until the engine control shuts down the engine (overspeed fault).

Again using a small, flat-blade screwdriver, set the DIP switch at position 5 to the OFF position (down).

If the overcrank and overspeed LEDs light at the same time on the ECU, reference troubleshooting flow charts in this service manual for additional information.

Sign off on the engine overspeed adjustment

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