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8. Adjust the volts/Hz (parameter 3P) until the voltage

level measured by the multimeter begins to drop.

When the volts/Hz is set correctly, the generator

(as load is applied) attempts to maintain normal

output until the engine speed drops below the

cut-in frequency set in step 7.

9. Reset the engine speed to the operating frequency

(50 or 60 Hz) by adjusting the engine governor

speed (parameter 4P).

10. Readjust the voltage stability (gain, parameter 2P),

if necessary.

11. Readjust the voltage (parameter 1P), if necessary.

12. Save settings. See Figure 1-34.

13. Stop the generator set.

1.13.2 Frequency Adjustment

The engine speed determines the generator output

frequency; 60 Hz units operate at 3600 rpm and 50 Hz

units run at 3000 rpm. Adjust the engine governor

speed and gain to set the output frequency and stability

using the following procedure.

Note: Refer to the flowcharts in Figure 1-32 through

Figure 1-34 during the following procedure.

TP-6967 2/21

Frequency Adjustment Procedure

Note: Refer to the flowcharts in Figure 1-32 through

Figure 1-34 during the following procedure.

1. Attach a frequency meter to the AC output leads or

an electrical outlet on the load side of the generator

set.

2. Start and run the generator set until it reaches

normal operating temperature (at least 10 minutes).

3. Adjust

the

electronic

(parameter 4P) to obtain a frequency reading of

60 Hz (or 50 Hz if appropriate). Each step changes

the engine speed about 3.6 rpm, which changes

the output frequency about 0.06 Hz.

4. Check stability with the generator set running and

with no load applied. If the generator set speed is

unstable, hunts, or surges, adjust the governor

stability (gain, parameter 5P) until the generator

set becomes stable with no hunting or surging.

(Increasing the gain slows the governor response.)

5. Check the frequency reading. Repeat steps 3 and

4 if necessary to obtain the rated frequency and

stable operation.

6. Save settings. See Figure 1-34.

governor

speed

Section 1 Installation