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37.2 When the Alarm LED is Blinking
When Alarm LED of drive is blinking, the protection function is generated. Please count the number of blink-
ing and refer to chart below. The Alarm LED is blinking 1 to 15 times (0.5 seconds on, 0.5 seconds off), the
same number of blinking will be repeated after 2 seconds.
Flash
Times
Alarm
Contents
Conditions The Cause of Error Checking Point Corrective Measure
1
Over
Current
The cur-
rent through
motor-driv-
en devices
exceeds the
limit value
If motor has a problem
Checking the status of the
short-circuit of the motor cable.
(A and/A, B and B, A or /A
and motor body, B or /B and
Motor body)
① Replace the motor.
If drive has a problem
① If Alarm keep blinking after
replace the motor, replace
drive.
2 Over Speed
Motor speed
exceed
3,000rpm
The host controller like PLC
send speed command of over
3,000rpm
Checking speed command of
host controller (PLC)
① Lower the speed
command of the host controller.
3
Position
Tracking
Error
Position error
value is
higher than
90˚ in motor
run state
The rotation of motor is not
smooth because of mechani-
cal problem
Checking the assemble status
of the unit(unscrews, debris,
and deformation structures)
① Fix the defected structure of
the equipment.
Operate brake when it is
locked
Checking the brake cable by
brake operation sound.
Checking if 24V is supplied to
No.2(ST) and No.16(MINI) termi-
nal of I/O connector.
Checking the terminal signal of
No.1(ST) and No.17(MINI) of I/O
connector. If brake hold it self,
it means 24V. if not it is 0v.
① Fix the defect of brake.
② If brake control signal is
correct, replace the brake.
Motor does not operate
because motor is damaged
Checking if the motor bearing is
damaged. -> Power off the mo-
tor, and listening to sound while
rotate shaft of motor by hand.
Checking a short circuit and
disconnection of motor cable.
-> Checking a short circuit and
disconnection by multimeter.
① Replace the motor when
bearing is damaged, discon-
nection of motor cable and
short circuit.
Motor does not operate be-
cause encoder is damaged
Checking the connection status
of encoder cable.
-> Checking short circuit,
disconnection, faulty wiring of
cable.
① Correct the mis-wiring.
② Replace the cable when
cable is disconnected.
③ Correct the short circuit.
Motor does not operate
because of transient shock to
mechanical
part
Cause of Shock elimination
① Remove the cause of the
shock.
If drive has a problem
② If Alarm keep blinking after
tried all of above, replace the
drive.
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