8. MAINTENANCE
8 - 4
Alarm Status
Segment LED
Display
Alarm Code
ALM8,4,2,1
Abbreviation
Alarm
Name
Alarm
Clear
Contents
0010 OL Overload Possible • Overload was detected in servo amplifier
and motor combination
Alarm code 0,1 indicates: when Func2/ bit7,6 =”0,0”, “0”= output open and “1”= output short.
Operating state when alarm occurred
POSSIBLE CAUSES
OPERATING STATE
123456 7 8 9
When control power supply is turned on
○
When servo ON is inputted
○ ○
○
After position command input (when motor is not
rotating)
○
○ ○ ○
○
After position command input (after operating for
a short period)
○ ○ ○
△ ○
Corrective Measures
CAUSES CORRECTIVE MEASURES
1
Faulty amplifier control board or
power module
Replace servo amplifier.
2 Faulty servomotor sensor circuit Replace servomotor.
3 Effective torque is exceeding
rated torque
• Monitor torque generated by motor using the estimated effective
torque (Trms) of MODE5/ page12 of remote operator to check if
effective torque is exceeding rated torque.
• Or, calculate effective torque of motor from the load and
operating conditions
→ If effective torque is higher than rated torque, review
operating or load conditions, or replace with larger capacity
motor.
4 Incorrect combination of amplifier
and motor.
• Check if motor code of Mode4/ page6 of remote controller
conforms to servomotor. Correct if necessary.
5 Holding brake of servomotor is
not released
Check brake wiring for errors. Replace servomotor if brake wiring
is found to be correct (and voltage is applied as specified),
6 Incorrect wiring of U, V, W phases
between amplifier and motor
Check and correct wiring.
7 One or all of the U, V, W phase
wirings between amplifier and
motor is disconnected
Check and correct wiring.
8 Mechanical interference Review operating conditions and limit switch.
9 Encoder pulse does not meet motor Set to encoder pulse number of motor
<Overload cause #3: Effective torque is exceeding rated torque>
Repeatedly turning the control power OFF→ON may cause the servomotor to burn.
While investigating this cause, please ensure that sufficient time is allowed for cooling down
after power OFF (30 minutes or more).
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