Multiquip Portable Generator DCA400SSI4F3/B/PB/PD

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

Warning: This adjustment requires trained personnel!

If engine is not started, report the issues to the maintenance team and stop the procedure

Turn the engine fault delay adjustment potentiometer 30 turns counterclockwise

The purpose of the delay is to allow time for oil pressure to build adequately, before the oil pressure monitor starts checking the oil pressure sender. High water temperature is also ignored during the fault delay time to allow engine coolant to circulate in the engine.

Sign off on the fault delay adjustment

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

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 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?

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?

Warning: This procedure requires trained personnel with PPE!

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

Is the 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