Powerboostt V Voltage Regulators (15 And 20 Kw Models); Powerboostt V Voltage Regulator Test - Kohler 7.5EOR Service

7.5 PowerBoostt V Voltage
Regulators (15 and 20 kW
Models)
The generator set is equipped with a PowerBoostt V
voltage regulator. See Figure 7-6. The PowerBoostt V
voltage regulator monitors output voltage magnitude to
control the current to the generator exciter field. The
voltage regulator has an underfrequency unloading
feature that is referred to as volts-per-Hz (V/Hz). To
determine if the voltage regulator is functioning, reduce
the engine speed (Hz) and watch for a corresponding
drop in the AC voltage. The AC voltage should remain
constant until the engine speed drops below 57.5 Hz on
60 Hz models or 47.5 Hz on 50 Hz models.
When the frequency drops below either 57.5 or 47.5 Hz,
the AC voltage should decline. Perform the following
test to check the regulator output.
1
Input
Green
STAB V/HZ VOLTS
Sensing
6
Yellow
5
1. LED1 (green input)
2. LED2 (red output)
3. Voltage potentiometer
Figure 7-6 PowerBoostt V Voltage Regulator
7.5.1 PowerBoostt V Voltage
Regulator Test
Use the following components to test the voltage
regulator:
D
Step-up transformer, 1:2, 120 volts to 240 volts
(1.0-amp minimum)
D
Lamp, 250-volt, 100-watt
D
AC voltmeter (250-volt minimum)
D
Fuse,1-amp
D
Switch,1 single-pole single-throw (SPST) (1-amp
minimum)
D
Plug, 120-volt AC (200--240 volt AC plug optional)
D
Insulated copper wire, #14 AWG (minimum)
42 Section 7 Generator Troubleshooting
2
Output
8
Red 7
6
5
4
3
2
1
4 3
TP-593657
4. LED3 (yellow sensing)
5. Volts/Hz potentiometer
6. Stability potentiometer

PowerBoostt V Voltage Regulator Test

Procedure:
1. Connect the components as shown in Figure 7-7.
If a 200--240 volt power source is available, the
step-up transformer is not required.
2. Turn the volts potentiometer fully counterclockwise.
3. Plug the power cord into the outlet.
4. Turn the power supply on.
should indicate a power supply voltage of
200--240 volts. The lamp should be off. If the lamp
is lit, replace the voltage regulator.
5. Slowly turn the volts adjustment potentiometer
clockwise. The lamp should light. Replace the
voltage regulator if the lamp does not light.
1
Input
Green
STAB
V/HZ VOLTS
Sensing
10
Yellow
9
7
8
12
11
13
14
11
13
1. LED1 (input)
2. PowerBoostt V voltage regulator
3. LED2 (output)
4. 250-volt, 100-watt lamp
5. AC voltmeter 250 volt (minimum)
6. 1:2 step-up transformer
7. Single-pole single-throw switch
8. 1-amp fuse
9. LED3 (sensing)
10. Volts potentiometer
11. Black wire
12. 100--120 VAC
13. White wire
14. 200--240 VAC (optional)
Figure 7-7 PowerBoostt V Voltage Regulator Test
The AC voltmeter
2
3
Output
4
8
Red 7
6
5
4
3
2
1
66
55
6
7
8
TP-593655
TP-6073 4/06
5