CHAPTER 7
TROUBLESHOOTING
7-1. Self-diagnostic Function .....................................................202
1. Operation Monitor LEDs When an Error Occurs...........202
2. Operation Status When an Error Occurs ........................203
1) Duplicated Output Error (Total-check Error) ......203
2) Battery Error (Self-diagnostic Error)...................203
3) Operation Error (Self-diagnostic Error)...............203
7-2. Troubleshooting...................................................................204
1. Points to be Checked When an Error Occurs.................204
■ When an ERR. LED is ON ..................................205
■ When an ALARM LED is ON.............................209
■ When all LEDs are OFF ......................................210
■ Diagnosing output malfunction............................211
■ When “PLC=COMM. ERR” is displayed
on the NPST-GR screen .......................................214
■ When “PROTECT ERROR” is displayed ...........215
7-3. Maintenance ........................................................................216
1. Preventive Maintenance .................................................216
2. Replacement of Backup Battery.....................................216
1) Battery Life..........................................................216
2) How to Replace Backup Battery..........................217
3. Removable Terminal ......................................................217
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