LS ELECTRIC L7NHF Series, User Manual

Page: 373 / 409

12. Maintenance and Inspection
12-9
Alarm Code Names Causes Inspection Items Measures to Take
Momentary power
outage Check the main power fail check
time setting [0x2007].
Increase the monitoring interval of
the main power fail check time
[0x2007] or check the power supply.
Drive abnormality
-
If alarms occur continually after
power cycling, there may be a
problem with the drive. Replace the
drive.
Control power fail
(Control power fail)
A voltage failure between
C1 and C2 phases.
The voltage between C1 and C2
phases should be within 200-230
Vac.
Re-verify the control power.
Drive abnormality
-
If alarms occur continually after
power cycling, there may be a
problem with the drive. Replace the
drive.
Over speed limit
(Over speed limit)
Motor cable abnormality
Check for abnormal wiring and
short circuit.
Replace the motor cable.
Encoder cable
abnormality Check for abnormal wiring and
short circuit.
Replace the encoder cable.
Parameter setting
abnormality
Motor ID [0x2000], encoder type
[0x2001], and encoder resolution
[0x2002] settings should be the
same as the motor label
information.
Modify the parameters so that they
match the information on the motor
label.
Check the gear ratio [0x6091]
setting. Set the electric gear ratio to a lower
value.
Check the gain control parameter
settings [0x2100] - [0x211F]. Re-adjust gain according to the
operation conditions.
Encoder abnormality
-
If alarms occur continually after
power cycling, replace the motor
since there may be abnormalities in
the motor.
Drive abnormality
-
If alarms occur continually after
power cycling, replace the drive
since there may be abnormalities in
the drive.
POS following
(Excessive Position
Error)
Parameter setting
abnormality
Check the gear ratio [0x6091]
setting.
Set the electric gear ratio to a low
value
.
Check the settings for following
error window [0x6065] and
following error timeout [0x6066].
Readjust the parameter according to
the operation condition.
Apparatus abnormality
Check for binding of the
apparatuses.
Inspect the apparatuses.
Drive abnormality
-
If alarms occur continually after
power cycling, replace the drive
since there may be abnormalities in
the drive.
Excessive SPD
deviation
(Excessive SPD
deviation)
Motor cable abnormality
Check for disconnection,
abnormal wiring and short circuit.
Replace the motor cable.
Encoder cable
abnormality Check for disconnection,
abnormal wiring and short circuit.
Replace the encoder cable.
Parameter setting
abnormality
Motor ID [0x2000], encoder type
[0x2001], and encoder resolution
[0x2002] settings should be the
same as the motor label
information.
Modify the parameters so that they
match the information on the motor
label.
Check the gear ratio [0x6091]
setting. Set the electric gear ratio to a lower
value.
Apparatus abnormality
Check for binding of the
apparatuses.
Operation status of the limit
contact sensor
Inspect the apparatuses.
Encoder abnormality
-
If alarms occur continually after
power cycling, replace the motor
since there may be abnormalities in