Transformer Primary Check
See
Electrical Schematics, page 94
.
1. Check wires and transformer:
a. See
.
b. Shut off CB15.
c. Use an ohmmeter to test for continuity
between terminals 2 and 4 of CB15. If there
is no continuity, check transformer and wiring
between CB15 and TB31 located behind the
lower cover. Go to step 2.
2. Check transformer and TB31:
a. See
.
b. Remove the lower cover.
c. Locate the two smaller (10 AWG) wires,
labeled 1 and 2, coming out of transformer.
Trace these wires back to terminal blocks
TB31.
d. Use an ohmmeter to test for continuity
between two wires; there should be
continuity.
Transformer Secondary Check
See
Electrical Schematics, page 94
.
1. Check wires and transformer:
a. See
.
b. Disconnect 7 pin green connector from TCM.
c. Use an ohmmeter to test for continuity
between terminals 6 and 7 on the TCM 7 pin
green connector. There should be continuity.
If there is no continuity, check transformer
and wiring.
d. Leave 7 pin green connector disconnected
from TCM.
2. Check transformer:
a. Remove lower cover.
b. Locate the two larger (6 AWG) wires, labeled
3 and 4, coming out of transformer. Trace
these wires back to TB31. Use an ohmmeter
to test for continuity between two transformer
wires in terminal block TB31; there should
be continuity.
c. Reconnect the 7 pin green connector to the
TCM.
d. Apply incoming power to system.
e. To verify voltage on the secondary leads
of the transformer, measure between the
transformer leads labeled 3 and 4 at TB31.
For a 240 VAC input, verify the transformer
output voltage is approximately 90 VAC (for
H-30, H-XP2) or 120 VA C (for H-40, H-50,
H-XP3).
f. See the Diagnostic Run Screen on the ADM.
The Diagnostic Run Screen displays the
incoming (90 or 120 VAC) to the TCM “Hose
Voltage”. The diagnostic screen will show a
Hose Voltage of “0” volts if the circuit breaker
has been tripped for the incoming power to
the TCM.
Note
The Diagnostic Run Screen is
disabled by default and must be
enabled in the Setup screens.
See the Operation manual for
instructions.
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334946A