Inovance SV820N Series, Manual

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5 Troubleshooting
5
■ E3.939: Motor power cable breaking
Cause:
The actual phase current of the motor is smaller than 10% of the rated motor current, and the actual motor
speed is small but the internal torque reference is very large.
Probable Cause Confirming Method Corrective Action
The motor power
cables break.
Check whether the difference between 200B-19h (phase current
effective value) and 200B-03h (internal torque reference) reaches
over 500%, and whether 200B-01h (actual motor speed) is smaller
than 1/4 of the rated motor speed.
Reconnect the motor
power cables. Use new
cables if necessary.
■ E3.941: Parameter modification taking effect only after powering on again
Cause:
After the function code property "effective time" as "power-on again" is modified, the servo drive prompts the
user to power on again.
Probable Cause Confirming Method Corrective Action
Function codes with changes
immediately in effective are
modified.after powering on again
check whether function codes with "effective time"
as "power-on again" are modified.
Power on the servo drive
again.
■ E3.942: Parameter storage too frequent
Cause:
The number of function codes that are modified once exceeds 200.
Probable Cause Confirming Method Corrective Action
A great number of function code
parameters are modified and
stored frequently to EEPROM
(200C-0Eh=1)
Check whether the host controller performs
frequent and fast function code parameter
modification on the servo drive.
Check the running mode. For
parameters that need not be
stored in EEPROM, set 200C-0 Eh
to 0 before the writing operation of
the host controller.
■ E3.950: Positive limit switch warning
Cause:
The logic of the DI allocated with FunIN.14: P-OT (positive limit switch) is valid.
Probable Cause Confirming Method Corrective Action
The logic of the DI
allocated with FunIN.14:
P-OT (positive limit switch
inhibited) is valid.
Check whether a DI is allocated with
FunIN.14 (P-OT) in group 2003h.
View whether the DI logic is valid in
200B-04h (monitored DI states).
Check the running mode. On the prerequisite
of ensuring safety, send a reverse reference
or rotate the motor to make the logic of DI
with the positive limit switch function become
invalid.
■ E3.952: negative limit switch warning
Cause:
The logic of the DI allocated with FunIN.15: N-OT (negative limit switch) is valid.
Probable Cause Confirming 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.
View whether the DI logic is valid in
200B-04h (monitored DI states).
Check the running mode. On the prerequisite
of ensuring safety, send a reverse reference
or rotate the motor to make the logic of DI
with the negative limit switch function become
invalid.