SMC Networks LECSB2-T Series User Manual

8. TROUBLESHOOTING
8 - 29
Alarm No.: 25
Name: Absolute position erased
Alarm content
・The absolute position data is faulty.
・Power was switched on for the first time in the absolute position detection system.
・After the scale measurement encoder was set to the absolute position detection system, the power
was switched on for the first time.
Detail
No.
Detail name
Cause
Check method
Check result
Action
25.1
Servo motor
encoder -
Absolute
position erased
(1)
Power was switched on
for the first time in the
absolute position
detection system.
Check if this is the first
time you switched on
the power in the
absolute position
detection system.
This is the first time.
Check that the battery is
mounted correctly, and
make home position
return.
This is not the first
time.
Check (2).
(2)
1) When a battery
Battery case was used,
CN4 of the driver was
disconnected during
control circuit power
supply off.
Check if the battery
was removed in this
way when the control
circuit power supply
was off.
It was removed.
Check that the battery is
mounted correctly, and
make home position
return.
(6)
The battery voltage is
low. The battery is
consumed.
Check the battery
voltage with a tester.
It is less than 3 V
DC.
Replace the battery.
It is 3 V DC or
more.
Check (7).
(7)
The voltage has
dropped greatly in the
encoder cable wired to
the battery.
Check if a
recommended
cable is used for the
encoder cable.
It is not used.
Use a recommended
wire.
It is used.
Check (8).
(8)
A battery cable is
malfunctioning.
Check for the loose
connection with a
tester.
It has a failure.
Replace the battery
cable.
It has no failure.
Check (9).
(9)
There is a loose
connection of the
encoder cable on the
servo motor side.
Check for the loose
connection with a
tester.
Measure the voltage on
the servo motor side.
It has a failure.
Repair or replace the
encoder cable.
It has no failure.
Check (10).
(11)
The driver is
malfunctioning.
Replace the driver, and
then check the
repeatability.
It is not repeatable.
Replace the driver.
It is repeatable.
Check (12).
(12)
An encoder is
malfunctioning.
Replace the servo
motor,and then check
the repeatability.
It is not repeatable.
Replace the servo motor

SMC Networks LECSB2-T Series Specifications

General

Brand	SMC Networks
Model	LECSB2-T Series
Category	DC Drives
Language	English