8. MAINTENANCE
8 - 13
Alarm Status
Segment LED
Display
Alarm Code
ALM8,4,2,1
Abbreviation
Alarm
Name
Alarm
Clear
Contents
1101 OVF Excess
position
deviation
Possible Position loop deviation counter exceeded
allowable value
Operating State when alarm occurred
POSSIBLE CAUSES
OPERATING STATE
12345678 9 10 111213
When control power supply is turned on
○
During stoppage at servo ON
○
○
When command input is started
○ △ ○ ○ ○
○ △ ○
△
During high speed start or stoppage
○ ○
○ ○ ○
△ ○
During operation with a long command
○
○ △
△
After JOG/ Tune
○
Corrective Measures
CAUSE CORRECTIVE MEASURES
1 Position command frequency is too high, or
acceleration/deceleration time is too short.
Review controller position command.
2 Load inertia is too high or motor capacity is
too low
Review load conditions, or change to larger capacity
motor.
3 Holding break is not released Check and correct wiring. Replace servomotor if
wiring is correct (and voltage is applied as specified),
4 Motor is mechanically locked, or there is
mechanical interference
Review mechanics
5 One or all of the U, V, W phases between
amplifier and motor is disconnected.
Check and correct wiring.
6 Motor rotation caused by external force
(gravity, etc.) during stoppage (completion of
positioning).
Review load or change to larger capacity motor.
7 • Current limiter is activated by command from
controller, with limit value set too low.
• Set encoder pulse number does not match
motors.
• Increase limit value or switch off current limiter.
• Change to the encoder pulse number of motor
8 Improper servo parameter setting (position
loop gain, etc.)
Revise parameter setting (increase position loop gain,
etc.).
9 Excess deviation setting is too low Increase excess deviation value from controller.
10 Faulty amplifier control board Replace servo amplifier.
11 Faulty servomotor sensor Replace servomotor.
12 Power supply voltage drops Check power supply voltage again.
13 Normal and no problem
This is in considering to deviation left at controller after
JOG operation or tuning from remote controller. Clear
alarm to recover, or stop alarm by setting MODE2/
page7/ bit4 to “1” with remote controller to stop alarm.
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