3C7-04000-1 Tohatsu FUEL PUMP

Personal injury or death can result from high voltage.When power generation equipment must be in operation to make tests and/or adjustments, high voltage and current are present.Improper test equipment can fail and present a high voltage shock hazard to its user.Make sure the testing equipment is designed for and correctly operated for high voltage and current tests being made.When servicing or repairing electric power generation equipment:
Make sure the unit is off-line (disconnected from utility and/or other generators power service) , and either locked out or tagged DO NOT OPERATE.
Remove all fuses.
Make sure the generator engine is stopped.
Make sure all batteries are disconnected.
Make sure all capacitors are discharged.Failure to do so could result in personal injury or death. Make sure residual voltage in the rotor, stator and the generator is discharged.
Accidental engine starting can cause injury or death to personnel working on the equipment.To avoid accidental engine starting, disconnect the battery cable from the negative (−) battery terminal. Completely tape all metal surfaces of the disconnected battery cable end in order to prevent contact with other metal surfaces which could activate the engine electrical system.Place a Do Not Operate tag at the Start/Stop switch location to inform personnel that the equipment is being worked on.
The voltage regulator is located in the enclosure for the control panel.The voltage regulator is powered by two auxiliary windings. These windings are independent from the circuit for detection of voltage. The first winding is labelled as "X1" and "X2". This winding has a voltage that is proportional with the output voltage of the generator. The second winding is labelled as "Z1" and "Z2". This winding has a voltage that is proportional to the current of the stator. The voltage from the power supply is rectified and filtered before being used by the regulator monitoring transistor. This principle ensures that regulation is not affected by interference that is generated by the load. These voltage regulators may have an optional remote potentiometer for voltage adjustment. This potentiometer is 450 ohms 0.5 W minimum. The adjustment range is 5%. The voltage range is limited by the internal potentiometer "P2". Remove "ST4" in order to connect the potentiometer. A 1000 ohm potentiometer can also be used to extend the adjustment range.
Illustration 1 g01145237
Illustration of the control panel for open gensets
Illustration 2 g01145745
Illustration of a control panel for enclosed gensets
Remove bolts (2) from the side of control panel (1).
Remove panel (3) in order to access the voltage regulator. R230 Adjustments
Table 1
R230 Regulator
Voltage regulation 0.5%
Voltage detection range 85 to 139 V (50/60 Hz)
Rapid response time for a transient voltage variation amplitude of 20% 500 ms
Voltage setting "P1"
Stability setting "P2"
8 Amp Fuse for protection of the power supply 10 amperes for 10 seconds
50 or 60 Hz selection with jumper "ST3"(1).
Underspeed protection and adjustment of frequency threshold via potentiometer "P3"
(1) The engine speed setting must be changed in order to change the frequency of the generator set.
Illustration 3 g00952495
R230 Voltage Regulator with components
Illustration 4 g00952510
R230 connections
Use the following procedure to adjust the R230 voltage regulator.
Make sure that the "ST3" wire is connected for 50 Hz applications. Remove the "ST3" wire for 60 Hz applications. Also, the engine speed must be changed from the factory setting in order to change the frequency of the generator. Refer to the Operation and Maintenance Manual, "Change the Engine Speed for Desired Frequency" in this section.
Turn potentiometer "P1" to the full counterclockwise position.
Turn the potentiometer "ST4" to the middle of the total rotation for the potentiometer ,if equipped. Run the generator at the rated speed. If the voltage does not increase, the field may need to be energized. Refer to the "Special Use" section.
Turn potentiometer "P1" until the rated output voltage is obtained.
Adjust the stability with potentiometer "P2".
The sealed potentiometer "P3" is set at the factory for 50 Hz or 60 Hz. R438 and R448 Adjustments
"ST9" must be closed for AREP excitation.