22 -
50
22. TROUBLESHOOTING
Situation
Cause
Countermeasure
Exa
m
pl
e 5
Load does not turn
OFF.
Transistor
output with
clamp diode
• Sneak path due to the use of two power supplies.
• Sneak path occurs when E1 R E2.
• Use only one power supply.
• Connect a diode for a sneak path.
When the load is a relay or similar device, a
reverse voltage absorbing diode must be
connected to it.
(Shown by dotted line in the figure at left)
Ex
ample 6
Load does not
operate normally (due
to external shorting,
etc.)
AY60EP,
AY80EP,
AY81EP,
AY82EP,
External load malfunction or incorrect connection.
• Check the external load.
• Check voltages across the following terminals
with output (Y) on.
If output voltage 3V, check external load and
wiring for short circuirs.
Summary of Contents for Q2ACPU
Page 1: ......
Page 2: ......
Page 221: ...12 12 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Page 222: ...12 13 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU ...
Page 237: ...12 28 12 OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU MEMO ...
Page 271: ...16 13 16 POWER SUPPLY MODULE 4 Names and description of parts of the A66P ...
Page 343: ...21 21 13 MAINTENANCE AND INSPECTION 21 4 2 Replacement of the fuse for an output module ...
Page 357: ...22 12 22 TROUBLESHOOTING ...
Page 359: ...22 14 22 TROUBLESHOOTING MEMO ...
Page 429: ...App 32 APPENDICES Trigonometric function Classification Symbol Description ...
Page 537: ...App 140 APPENDICES REMARK 1 Message 1 An error code is displayed in 2 Alert 1 3 Alert 2 ...
Page 539: ...App 142 APPENDICES 2 Q2ACPU Q2ACPU S1 modules Unit mm inch ...
Page 541: ...App 144 APPENDICES 2 A66P power supply module Unit mm inch ...
Page 543: ...App 146 APPENDICES 3 A35B base unit 4 A38B A38HB A38HBEU base unit Unit mm inch Unit mm inch ...
Page 567: ...MEMO ...
Page 569: ......
Page 570: ......