Section 1 Capacitive Discharge (Brushless)
8
Diagnostic Repair Manual
6.
Connect one meter lead to an excitation winding
and connect the other meter lead to a power
winding. INFINITY should be measured.
7.
Repeat Step 6 using an excitation winding and
another power winding. INFINITY should be
measured.
Results
1.
Stator winding resistance values is a test of
winding continuity and resistance. If a very high
resistance or INFINITY is indicated, the winding is
open or partially open.
2.
Test for a “grounded” condition: Any resistance
reading indicates the winding is grounded.
3.
Test for a “shorted” condition: Any resistance
reading indicates the winding is shorted.
4.
If stator tests good and wire continuity tests good,
refer to flow chart.
Test 8 – Test Brushless Stator
Windings
General Theory
The brushless stator has three internal windings, two
main power windings and an excitation winding. This test
will ensure there are no shorts between the power
windings or shorts to ground.
A DMM can be used to test the stator windings for the
following faults:
•
An open circuit condition
•
A “short-to-ground” condition
•
A short circuit between windings
NOTE:
The resistance of stator windings is very low.
Some meters will not read such a low resistance, and will
simply indicate CONTINUITY. Recommended is a high
quality, digital type meter capable of reading very low
resistances.
Procedure
1.
Disconnect all power windings from the receptacle
panel so the stator is isolated.
2.
Make sure all the disconnected leads are isolated
from each other, and are not touching the frame
during the test.
3.
Set DMM to measure resistance.
4.
Connect one test lead to one stator power winding
lead. Connect the other test lead to the other stator
power winding lead of the same winding. Stator
resistance should be as referenced in the
specifications.
5.
Repeat step 4 with the other power windings.
Stator resistance should be as referenced in the
specifications.
Test windings for a short to ground:
1.
Make sure all leads are isolated from each other
and are not touching the frame.
2.
Connect one test lead to a clean frame ground.
Connect the other test lead to a stator lead.
a. The meter should read INFINITY.
b. Any reading other than INFINITY indicates a
“short to ground” condition.
3.
Repeat Step 2 using the other stator lead.
Test for a short circuit between windings:
1.
Make sure all leads are isolated from each other
and are not touching the frame.
2.
Connect one test lead to a stator lead. Connect the
other test lead to the other stator lead.
a. The meter should read INFINITY.
b. Any reading other that INFINITY indicates a
short between windings.
Test 10 – Check Load Voltage and
Frequency
Procedure
Perform this test the same as Test 1 but apply a load to
the generator equal to its rated capacity. With load
applied check voltage and frequency.
Frequency should not drop below about 59 Hertz with
load applied.
Voltage should not drop below about 220 VAC nor rise
above 265 VAC with load applied.
Results
1.
If voltage and/or frequency drop excessively when
load is applied, refer to flow chart.
2.
If load voltage and frequency are within limits, end
tests.
Test 11 – Check Load Watts and
Amperage
Procedure
Add up the wattages or amperages of all loads powered
by the generator at one time. If desired, a clamp-on
ammeter may be used to measure current flow.
See the
to determine
generator limits.
NOTE:
All figures are approximate. See data label on
appliance for wattage requirements.
Results
1.
If unit is overloaded, reduce load.
