Multiquip Portable Generator DCA70SSJU4F

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).

Warning: This procedure requires trained personnel with PPE!

Multimeter test leads placed across pins 1 and 2 on the ECU auto-start module

Multimeter reading between 2.25 VAC ± 0.50

If a low voltage reading is obtained, reference the 'MPU Installation and Adjustment' section

Sign off on the Mpu Ac Voltage Test

Warning: This adjustment requires trained personnel with PPE!

If engine is not off, shut it down before proceeding

Turn the engine crank disconnect adjustment potentiometer 30 turns counterclockwise

Turn the engine crank disconnect adjustment potentiometer about 3 turns clockwise

If the engine starts, the ECU engine running lamp should be lit. Once verified, shutdown the engine.

Adjust the the engine crank disconnect adjustment potentiometer 1 turn clockwise

Warning: This inspection requires trained personnel with PPE!

Visual inspection of the generator

Electrical Connections — Rusted, corroded and oxidized connections

Carbon Flash — Deposits around the 120/240V AC receptacles

Wire Overheating — Signs of wire overheating (discoloration and a burnt smell)

Infestation — Insects and rodents nests inside the generator

Terminal Lugs/Bus Bars — All nuts, bolts, screws, and fasteners are securely tightened

Electrical Connectors — All electrical connectors are seated correctly

NOTICE: For complete engine inspection and service specifications, consult the Engine Manufactures 'Owners' and/or 'Service' Manuals.

Air cleaner for restrictions and contaminants. Replace if necessary.

Cooling system hoses for cracks and distortions — tighten clamps or repair as needed.

Radiator for restrictions and corrosion.

Engine block heater for leaks and verify unit functioning properly. Engine block heater is an option on some units.

Coolant, fuel and oil leaks. Tighten connections or repair as needed.

Belts and pulleys for cracks and wear — adjust or repair as needed.

Governor and injection pump for leaks and proper operation.

Turbocharger for proper clearance and free movement as required. Reference engine service manual.