5 Troubleshooting
5
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Er.941: Parameter modification taking effect only after re-power-on
Cause:
Modification of some parameters takes effect only after servo drive is powered on again. After these
parameters are modified, servo drive reminds of re-power-on.
Cause
Confirming Methods
Corrective Action
Modify parameters, whose modification
takes effect only after re-power-on.
Check whether you modify parameters,
whose modification takes effect only after
re-power-on.
Re-power on the servo
system.
Er.942: Parameter storage too frequent
Cause
Confirming Methods
Corrective Action
A great number of parameters are
modified and stored frequently to
EEPROM (H0C-13 = 1).
Check whether host controller
performs frequent and fast
parameter modification on servo
drive.
Check the running mode. For the
parameters that need not be stored
in EEPROM, set H0C-13 to 0 before
writing operation of host controller.
Er.950: Forward limit switch warning
Cause
Confirming Methods
Corrective Action
Logic of DI set for
FunIN.14: P-OT (forward
limit switch) is valid.
Check whether a parameter in group H03
is set for FunIN14 (P-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 forward overshoot switch
terminal invalid.
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.
Summary of Contents for IS650P Series
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