Generac Power Systems NP-40G - Manual (Page 22)

Section 1.5- COMPONENTS TESTING
TESTING POWER PHASE WINDINGS
B. To test the Power Phase windings for a "short-to-
ground* condition, proceed as follows:
1. Make sure all leads are Isolated from each other and
are not touching the frame.
2. Set a VOM to its *Rx10,000" or "RxlK* scale and
zero the meter.
3. Connect one VOM test lead to the terminal end of
Lead" AC1", the other test lead to a clean frame ground
on the Stator.
a. The meter should read "infinity".
b. Any reading other than "infinity" indicates a
"short-to-ground* condition.
Stator Assembly (Continued)
NGS (CONT’D): NOTE: Any reading other than "Infinity'' Indicates
the winding Is shorted to ground. If winding Is open
or shorted, the Stator should be replaced.
TESTING POWER SUPPLY WINDINGS:
A. To test the Power Supply winding for an open circuit
condition, proceed as follows:
1. Disconnect the 4-pin connector from "CONN4" of
the CCG circuit board. See Rgure 3.
a. Stator lead "PS1* (Brown) connects to Pin 1 of
the connector.
b. Stator lead "PS2* (Yellow) connects to Pin 3 of
the connector.
2. Set a VOM to its *Rx1* scale and zero the meter.
3. Connect one VOM test lead to Pin 1 (Lead PS1-
Brown), the othet test lead to Pin 3 (Lead PS2-Yellow).
The meter should indicate the resistance of the Power
Supply winding.
NOMINAL RESISTANCE
POWER SUPPLY WINDING
0.35-0.44 ohm
B. To test the Power Supply winding for a “short-to-
ground" condition, proceed as follows:
1. Set the VOM to its “Rx10,000" or "RxlK" scale and
zero the meter.
2. Connect one VOM test lead to Pin 1 (Lead PS1-
Brown). Connect the other test lead to a clean frame
ground on the Stator. The meter should read "infinity".
Figures. "CONN4“4-Pin Connector
TESTING THE TIMING WINDING:
A. To test the Stator Timing winding for an open circuit
condition, proceed as follows:
1. Disconnect the 4-pin connector from "CONN4" of
the CCG circuit board. See Rgure 3.
a. Stator lead TIM1 (Orange) connects to Pin 2 of the
4-pin connector.
b. Stator lead TIM2 (Gray) connects to Pin 4 of the
4-pin connector.
2. Set a VOM to its *Rx1 * scale and zero the meter.
3. Connect one VOM test lead to Pin 2 (Lead TIM1-
Orang^; connect the other test lead to Pin 4 (Lead
TIM2- Gray). The meter should Indicate the Stator
Timing winding resistance.
NOMINAL RESISTANCE
STATOR TIMING WINDING
0.35-0.44 ohm
B. To test the Timing winding for a "short-to-ground"
condition, proceed as follows:
1. Set the VOM to its "Rx10,000* or "Rx1K" scale and
zero the meter.
2. Connect one VOM test lead to Pin 2 of the 4-pin
connector (Lead TIMI-Orange).
3. Connect the other test lead to a clean frame ground
on the Stator. The meter should read "Infinity". Any
reading other than "Infinity" Indicates the Timing
winding is shorted to ground.
SHORT CIRCUIT BETWEEN WINDINGS:
To test for a short circuit between windings, proceed
as follows:
1. Set a VOM to its "Rx10,000" or "RxlK" scale and
zero the meter.
2. Connect one meter test lead to Stator lead PS1
(Brown).
3. Connect the remaining test lead to Stator lead AC1
(Gray). The meter should read "Infinity*. Any reading
other than "infinity" indicates a shorted condition and
the Stator should be replaced.
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