Daikin VAM 150GJVE, Service Manual

Page: 62 / 112

Si71-502 Troubleshooting
Troubleshooting 53
1.18 Power Transformer
Error Detection
Method Check resistance and voltage with tester, and insulation resistance with megger.
Error Generating
Conditions
Possible Causes
Troubleshooting
„
Resistance of primary side of transformer: approx. 140
Ω
„
Resistance of secondary side of transformer: approx. 1.9
Ω
„
Voltage at secondary side of transformer when rated voltage is applied to primary side: approx. 26 VAC
„
Insulation resistance between primary side of transformer and case: 100 M
Ω
or higher
„
Insulation resistance between secondary side of transformer and case: 100 M
Ω
or higher
„
Insulation resistance between primary side and secondary side of transformer: 100 M
Ω
or higher
Check resistance of
primary side of
transformer.
Does
measured
resistance
deviate significantly
from values
shown
below?
YES
NO
Check resistance of
secondary side of
transformer.
Does
measured
resistance
deviate significantly
from values
shown
below?
YES
NO
Apply rated voltage to
primary side of
transformer, and check
output voltage of
secondary side
of transformer.
Does
measured
voltage deviate
significantly from
values shown
below?
YES
NO
Transformer is faulty.
Transformer is faulty.
Transformer is faulty.
Transformer is normal
(HF016)
(HL037)
Check resistance and voltage