Voltage Regulator Adjustment | Bryant ASPAX1BBA015 guide

Section 3 — Operation

15 kW Generator

2.7ENGINE GOVERNOR ADJUSTMENT

If both AC frequency and voltage are correspondingly high or low, adjust the engine governor as follows:

2.7.1 15 KW UNITS

1. Loosen governor clamp bolt (See Figure 2.3).

Figure 2.3 — V-twin Engine Governor

Adjustment

Idle Spring

Governor

Shaft

(Rotate

Clockwise)

2.8VOLTAGE REGULATOR

ADJUSTMENT

With the frequency between 62-63.5 Hertz, slowly turn the slotted potentiometer (Figure 2.5) until line voltage reads 244-252 volts.

NOTE:

Remove the access panel on top of the control panel to adjust the voltage regulator.

Figure 2.5 – Voltage Adjustment Potentiometer

	Governor Clamp Bolt	No Load Idle
	Governor Clamp Bolt	Adjustment Screw
		Adjustment Screw

2.Completely remove the idle spring.

3.With governor arm at wide open throttle position, rotate governor shaft fully clockwise. Tighten clamp bolt to 84 inch-pounds.

4.Start unit and apply full load. Use full load speed adjust screw (Figure 2.4) to adjust frequency to 58 Hz.

5.Remove load, stop engine, loosen the idle adjust screw and reconnect the idle spring.

6.Push the governor arm to the closed throttle posi- tion. Make sure the idle spring does not stretch at all.

7.Restart the unit.

8.Slowly turn the idle adjust screw to adjust the no- load idle frequency to 63-63.5 Hz.

9.The governor is now set.

Figure 2.4 — V-twin Full Load Speed Adjust

Screw

Full Load Speed Adjust Screw

NOTE:

The voltage regulator is housed above the generator's control panel. The regulator maintains a voltage in direct proportion to frequency. For example, at 62 Hertz, line-to-neutral voltage will be 124 volts.

3.1BREAK-IN PROCEDURE

Once the unit has been installed and all electrical checks have been made, it is strongly recommended that the following “Break-in Procedure” be completed to ensure correct generator operation in the future.

1.Set the generator’s AUTO/OFF/MANUAL switch to AUTO.

2.Turn OFF the utility power supply to the transfer switch using the means provided (such as a utility main line circuit breaker).

3.The unit will start, and the transfer switch will transfer to standby.

4.Using the transfer switch’s built-in emergency load center, turn on circuits to load the generator to approximately 25% rated load and run the unit for one hour.

5.Run the unit for one hour at 50% rated load.

6.Run the unit for one hour at 75% rated load.

7.Run the unit for one hour at 100% rated load.

8.Turn ON the utility power supply to the transfer switch, which will allow the transfer switch to transfer back to utility power. The unit will con- tinue to run for one minute and then shut down.