5 Troubleshooting
5
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Er.952: Reverse limit switch warning
Cause
Confirming Methods
Corrective Action
Logic of DI set for
FunIN.15: N-OT
(reverse limit switch)
is valid.
Check whether a parameter in group
H03 is set for FunIN15 (N-OT).
Check whether logic of corresponding
DI is valid in H0B-03 (monitored DI
states).
Check the running mode. Send a reverse
reference or rotate motor on the prerequisite
of ensuring safety to make logic of the reverse
overshoot switch terminal invalid.
Er.980: Encoder internal fault
Cause
Confirming Methods
Corrective Action
It is encoder internal fault.
If the fault persists after you power on servo drive
several times, it indicates that the encoder is faulty.
Replace servo motor.
Er.990: Power input phase loss warning
Cause
Confirming Methods
Corrective Action
When H0A-00 = 1 (allow faults and
warnings at power input phase loss
protection), three-phase servo drive (0.75
kW) (H01-02 = 5) can run under single-
phase power. When single-phase power is
connected, this warning is reported.
Check whether it is a
three-phase servo drive
allowed to run under
single-phase power.
If the warning persists when a three-phase
servo drive is connected to three-phase
power, troubleshoot it as Er.420 (power
cable phase loss).
If the warning persists when a three-phase
servo drive is connected to single-phase
power, set H0A-00 to 0.
Er.994: CAN address conflict
Cause
Confirming Methods
Corrective Action
CAN address conflict
occurs.
Check whether H0C-00 (servo shaft
address) is allocated repeatedly.
Allocate servo shaft address of salves and
ensure that allocation of H0C-00 is not
repeated.
5.2.4 Internal Faults
When any of the following fault occurs, contact Inovance for technical support.
Er.602: Angle auto-tuning failure
Er.220: Phase sequence incorrect
Er.A40: Motor auto-tuning failure
Er.111: Servo internal parameters abnormal
