Generac Power Systems 941-2 Service Manual page 24

Section 1.5
COMPONENTS TESTING
STATOR ASSEMBLY (CONTINUED)
Figure 2. Schematic- Stator Windings
TESTING POWER SUPPLY WINDINGS:
A. To test the Power Supply winding for an open circuit condition,
proceed as follows:
1. Disconnect the 2-wire power supply from the
generator. See Figure 3.
2. Set a VOM to its "Rx1" scale and zero the meter.
3. Connect one VOM test lead to Lead PS1- Red,
the other test lead to Lead PS2 - Black. The
meter should indicate the resistance of the
Power Supply winding.
NOMINAL RESISTANCE
POWER SUPPLY WINDING
0.206-0.227 ohm
B. To test the Power Supply winding for a "short-to-ground" condi-
tion, proceed as follows:
1. Set the VOM to its "Rx10,000" or "Rx1 K" scale
and zero the meter.
2. Connect one VOM test lead to Lead PS1 - Red.
Connect the other test lead to a clean frame
ground on the Stator. The meter should read
"infinity."
NOTE: Any reading other than °Infinity" Indicates
the winding Is shorted to ground. If winding is
open or shorted, the Stator should be replaced.
Page 1.5-2
TESTING THE TIMING WINDING:
A. To test the Stator Timing winding for an open circuit condition,
proceed as follows:
1. Disconnect the 2-pin connector from "J5" of the
A6060 circuit board. See Figure 3.
a. Stator lead TIM1 (Orange) connects to Pin
1 of the "J5" connector.
b. Stator lead TIM2 (Gray) connects to Pin 2
of the "J5" connector.
2. Set a VOM to its "Rx1" scale and zero the
meter.
3. Connect one VOM test lead to Pin 1 (Lead TIM1
Orange); connect the. other test lead to Pin 2
(Lead TIM2- Gray). The meter should Indicate
the Stator Timing winding resistance.
NOMINAL RESISTANCE
STATOR TIMING WINDING
0.102-0.116 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 "Rx1 K" scale
and zero the meter.
2. Connect one VOM test lead to Pin 1 of the 2-pin
connector (Lead TIM1-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" indi-
cates 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 "Rx1K" scale
and zero the meter.
2. Connect one meter test lead to Stator lead PSi
(Red).
3. Connect the remaining test lead to Stator lead
AC1 (Grey). The meter should read "infinity".
Any reading other than "infinity" indicates a
shorted condition and the Stator should be
replaced.
4. Connect one VOM test lead to Stator lead AC1,
the other test lead to Stator lead 77. The VOM
should read "infinity".
5. Connect one VOM test lead to Stator lead AC1,
the other test lead to Stator lead TIM1. The
meter should read "infinity".
6. Connect one test lead to Stator lead PSI, the
other to Stator lead TIM1. "Infinity" should be
indicated.