Troubleshooting
Si-93
48
Troubleshooting
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
Summary of Contents for VAM 500EJ
Page 5: ...Si 93 iv Table of Contents...
Page 7: ...Introduction Si 93 vi 1 1 1 Cautions in Repair Warning...
Page 8: ...Si 93 Introduction vii...
Page 11: ...Si 93 2 General Constructions...
Page 15: ...Si 93 6 Operation...
Page 21: ...Si 93 12 Maintenance...
Page 27: ...Si 93 18 Control Functions...
Page 35: ...Si 93 26 Circuit Operations...
Page 39: ...Si 93 30 Troubleshooting...
Page 59: ...Troubleshooting Si 93 50 Troubleshooting...
Page 61: ...Si 93 52 Supplementary Explanation...
Page 72: ...Si 93 Appendix 63 Part 8 Appendix 1 Appendix 65 1 1 Wiring Diagram 65...
Page 73: ...Si 93 64 Appendix...
Page 74: ...Si 93 Appendix Appendix 65 1 Appendix 1 1 Wiring Diagram VAM500EJVE VAM800EJVE VAM1000EJVE...
Page 75: ...Appendix Si 93 66 Appendix VAM2000EJVE...
Page 79: ...Si 93 iv Index...
