Generac Power Systems GP Series Diagnostic Repair Manual page 34

Section 4 AC Diagnostic Tests
Test 5 – Check Continuity of
Receptacle Panel
Procedure
Set DMM to measure Resistance.
1.
See Figure 4-53.
2.
receptacle on unit.
NOTE: Only one outlet on each receptacle needs to be
tested.
Results
If any reading other than CONTINUITY was mea-
1.
sured, continue troubleshooting to determine if it is
the receptacle or the wiring. Repair or replace as
necessary.
If receptacles test good, refer to flow chart.
2.
0.01
Figure 4-53. Checking Continuity of Receptacles
Test 6 – Test Sensing Circuit Wires
Procedure
Set a DMM to measure resistance.
1.
Disconnect 12-pin alternator connector (CONN3P).
2.
See Control Panel Component Identification
connector location.
6 5
12 11 10
Figure 4-54. 12-pin Alternator Connector (CONN3P),
Male Side
Unplug six wires from terminals on AVR.
3.
See Figure 4-54.
4.
a. Connect the one meter test lead to Wire 11
(Pin 1) of the 12-pin alternator receptacle
(CONN3R) located at the bottom of the control
panel.
28
Connect DMM to
4 3 2 1
9 8 7
015031
NOTE: Connect a small jumper lead to the individual pin
for easier access.
b. Connect the other meter test lead to Wire 11 at
the voltage regulator.
c. Continuity should be measured.
each
See Figure
5.
a. Connect the one meter test lead to Wire 22
(Pin 2) of the 12-pin alternator receptacle
(CONN3R) located at the bottom of the control
panel.
NOTE: Connect a small jumper lead to the individual pin
for easier access.
b. Connect the other meter test lead to Wire 22 at
the voltage regulator.
c. Continuity should be measured.
Results
If continuity was not measured in any of the steps
1.
repair or replace defective wire.
If all steps pass refer back to flow chart.
2.
Test 7 – Test Stator Winding
Procedure
Disconnect Wires 11 and 44 from the 50 amp cir-
1.
cuit breaker.
Disconnect Wire 22 from the 50 amp receptacle.
015030
2.
Disconnect 12-pin alternator connector (CONN3P).
3.
See Control Panel Component Identification
connector location.
Set DMM to measure resistance.
4.
IMPORTANT NOTE: Digital multimeters (DMM) vary in
sensitivity and display range formats. Simpler meters
commonly used by electricians will read only one or two
for
decimal points. More robust meters may read up to four
decimal points. The actual resistance values for this
product are all below 0.1 ohms as shown in
The values shown in
for this procedure.
Table 4-2. Acceptable Readings
Stator
Winding Number
Power 11 – 22
Power 22 – 44
Sensing 11S – 22
Sensing 22S – 44
Excitation 2 – 6
* Resistance values In ohms at 20 °C. (68 °F.). Actual readings
may vary depending on ambient temperature.
4-54.
Table 4-2 are acceptable readings
Wire
15.5 kW
0.1 - 0.3
0.1 - 0.3
0.1 - 0.3
0.1 - 0.3
0.6 - 0.8
Diagnostic Repair Manual
for
Table 4-3.
18 kW
0.1 - 0.3
0.1 - 0.3
0.1 - 0.3
0.1 - 0.3
0.5 - 0.7