Generac Power Systems TXP - Manual (Page 41)

Either of 2 Sensing Transformers may be used. I4ien checking Transform­
er windings for an open condition, resistance readings obtained should
be as shown in the following CHART:
TEST 37 -
SENSING TRANSFORMER
TRANSFORMER
MAKE
RESIS.TANCE [in OHMS)
Primary Secondary
WesCoil
CoilTran
745-825
824-1114
1603 - 2169
1222 - 1654
A.) Remove wire nuts that retain
wires
#11
and #
22
, between the
Transformer and Voltage Regulator
Disconnect the wires. Set VOM to
”+DC’ and to ’’RxlOO” scale. Zero
the meter. Connect one meter test
probe to Wire #11, and the second
test probe to Wire #22. Meter
needle should swing upscale and
indicate resistance for SECONDARY
winding.
Sensing
Transformer
With Wires To
Secondary
Winding
White ' Pin No. 5
Receptacle
Pins No. 3 and
No. 5 to Primary
Winding of
Transformer ---------------
RESULTS: 1.) Checks Good.
2,) Checks Bad..
Continue tes.ts in "Diagnos­
tic Flow Charts", Section 3
.Replace Sensing Transformer
B. ) Set VOM to "+DC" and to "Rxl0,000" scale. Zero the meter. Connect
one meter test probe to Wire #11. Connect the second test probe to
Ground. Meter needle should NOT move. Any needle movement indicates a
shorted condition.
RESULTS: 1.) Tests Good................................................................... Continue tests in "Diag­
nostic Flow Charts"
2.) Tests Bad...................................................................Replace Transformer
C. ) Unplug the white connector plug from its receptacle. Set the VOM
to "+DC" and to "RxlOO" scale. Zero the meter. Connect one meter test
probe to White receptacle Pin #3. Connect the second test probe to
white receptacle Pin #5. Meter needle should swing upscale and indic­
ate resistance shown in CHART for PRIMARY winding,
RESULTS: 1.) Tests Good......................................................Continue tests in "Diagnostic
Flow Charts", Section 3
2.) Tests Bad................................................... Replace Transformer
D. ) Set VOM to "+DC" and to "Rxl0,000" scade. Zero the meter. Connect
one meter test probe to white receptacle Pin #3. Connect the remain­
ing test probe to Ground. .Meter.needle should not move.Any movement
of the needle indicates a shorted condition.
RESULTS. 1.) Tests Good......................................................Continue tests in "Diagnostic
Flow Charts", Section 3
2.) Tests Bad.................................................... Replace Transformer
4o20
Issued
6-78