IS810N-INT Series Servo System User Manual (Brief) Chapter 7 Troubleshooting
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E1.950: Positive limit switch warning
Cause:
The logic of the DI allocated with FunIN.14: P-OT (positive limit switch) is valid.
Probable Cause Conrming Method Corrective Action
The logic of the DI allocated 
with FunIN.14: P-OT (forward 
limit switch inhibited) is valid.
Check whether a DI is allocated 
with FunIN.14 (P-OT) in group 
2003h.
Check whether the DI logic is 
valid in 200B-04h (monitored DI 
states).
Check the running mode. 
Ensure safety, and then 
send a reverse reference or 
rotate the motor to make the 
logic of DI with the positive 
limit switch function become 
invalid.
E1.952: Negative limit switch warning
Cause:
The logic of the DI allocated with FunIN.15: N-OT (negative limit switch) is valid.
Probable Cause Conrming Method Corrective Action
The logic of the DI allocated 
with FunIN.15: N-OT 
(negative limit switch 
inhibited) is valid.
Check whether a DI is allocated 
with FunIN.15 (N-OT) in group 
2003h.
Check whether the DI logic is 
valid in 200B-04h (monitored DI 
states).
Check the running mode. 
Ensure safety, and then 
send a reverse reference or 
rotate the motor to make the 
logic of DI with the negative 
limit switch function become 
invalid.
E1.980: Encoder internal fault
Cause:
An encoder algorithm error occurs.
Probable Cause Conrming Method Corrective Action
An encoder internal fault 
occurs.
If the servo drive is powered 
off and on several times but 
the warning is still reported, it 
indicates that the encoder is 
faulty.
Replace the servo motor.
E1.998: Incorrect homing object dictionary
Cause:
Homing mode (6098h) sets an unsupported value.
Probable Cause Conrming Method Corrective Action
The value of object 6098h is 
not supported.
Check the setting value of object 
6098h.
Set parameters according to 
the specications.
E1.E20: Ethernet hardware error
Cause:
Ethernet hardware fault
Probable Cause Conrming Method Corrective Action
Ethernet hardware error
If the servo drive is powered 
off and on several times but 
the warning is still reported, it 
indicates that the Ethernet is 
faulty.
Replace the servo drive.