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Chapter 8│Troubleshooting 
8.1 Alarm and Fault Displays 
Table 8.1 Alarm and Fault Displays, Causes, and Possible Solutions   
External Fault 
  ( Input Terminal S1 to 
S6 )   
1. An external device 
tripped an alarm 
2. Incorrect wiring 
3. Multi-function input 
wiring is not correct 
1. Remove the cause of the 
external fault then reset the 
multi-function input. 
2. Confirm if the signal lines is 
properly connected to the 
terminals assigned for external 
fault detection (E1-口口= 23 to 
38) 
3. Confirm if E1-口口=23 to 38 is 
set to the unused terminals. 
PID Feedback High   
 
PID feedback input is 
greater than the 
detection level set to 
b5-22 for longer than 
the detection time set to 
b5-23 
1. b5-22 andb5-23 
inappropriate setting   
2. PID feedback wiring 
incorrect 
3. Feedback sensor 
malfunction   
4. Feedback input circuit 
malfunction 
1. Confirm b5-22 and b5-23 
settings 
2. Correct the wiring 
3. Replace the sensor if it is 
damaged 
4. Replace the PCB or drive.   
Contact the local distributor. 
PID Feedback Low 
 
When the PID feedback 
detection is enabled in 
b5-11, a FbL will be 
triggered while the PID 
feedback falls below the 
level set to b5-12 for 
longer than the time set 
to b5-13.   
1. Inappropriate setting in 
b5-12 and b5-13   
2. Incorrect PID feedback 
wiring 
3. Feedback sensor 
malfunction   
4. Incorrect feedback input 
circuit   
1. Correct b5-12 and b5-13 
settings 
2. Correct the wiring 
3. Replace the sensor if it is 
damaged 
4. Contact the local distributor to 
replace the board or the drive.   
1. Ambient temperature is 
too high 
1.Check the temperature 
surrounding the drive