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6. TROUBLESHOOTING
6-2
6.1 Message Appearing on the Operation Panel
6.1.1 Protective function activated
When the protective function is activated, any of the following messages may appears on the
operation panel or parameter unit. At this time, the ALARM lamp is lit, the drive unit output is shut
off, and the motor, if running, coasts.
MEMO
That the protective function has been activated can be exported from the control
circuit output terminal.
Refer to: Chapter 8, 8.7.2 Selection of the control circuit output
terminal functions
When the protective function is activated, perform inspection and take action in accordance with
Table 6-1 to remove its cause.
To restart, reset the drive unit in any of the following methods.
•
Switch power off once, then on again.
•
Short the terminals RES-SD for more than 0.1s.
•
Press the
STOP/RESET
key of the operation panel or parameter unit.
Table 6-1
Indication
Operation
panel
(Actual
characters
)
Parameter
unit
Protective
Function Name
Detection Level
Estimated Cause (
)
and
Corrective Action (
•
)
(E. 0C1)
Acceleration-
time overcurrent
Output current is
more than 200%
of motor rating.
The acceleration torque is beyond the drive
unit capability.
•
Increase the acceleration time.
•
Change the acceleration/deceleration
pattern to an S shape.
Outputs U, V and W are in a short circuit or
ground fault.
•
Check the motor winding resistance.
•
Check the connection cables for damage.
The motor restarted during coasting.
•
Restart it after a complete stop.
The start signal was given with power
supplied to the R1, S1 terminals only.
•
Supply main circuit power (R, S, T).
The capacity of the drive unit does not match
that of the motor.
(E. 0C2)
Constant speed-
time overcurrent
Output current is
more than 200%
of motor rating.
Excessive load was applied instantaneously.
Outputs U, V and W resulted in a short circuit
or ground fault during constant-speed
operation.
•
Check the motor winding resistance.
•
Check the connection cables for damage.
The capacity of the drive unit does not match
that of the motor.
(E. 0C3)
Deceleration-
time overcurrent
Output current is
more than 200%
of motor rating.
The deceleration torque is beyond the drive
unit capability.
•
Increase the deceleration time.
•
Change the acceleration/deceleration
pattern to an S shape.
Outputs U, V and W resulted in a short circuit
or ground fault during deceleration operation.
•
Check the motor winding resistance.
•
Check the connection cables for damage.
The mechanical brake of the motor operates
too early.
•
Delay the operation timing.
The capacity of the drive unit does not match
that of the motor.