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F-24
6.13.3 Retry function
Retry selection
Warning
Mandatory
Do not get near the alarm-stopped motor and machine.
When the inverter is in retry mode, the alarm-stopped motor and machine unexpectedly
restart when the predetermined time has passed, and thus might cause you to get an injury.
Stick caution labels to the inverter, the motor and the machine, to prevent accidents
due to an unexpected restart of them because of the retry function.
[Parameter setting]
Title Function Adjustment range Default setting
Retry selection
0: Disabled, times
Causes of tripping and retry process
Cause of tripping Retry process Canceling conditions
Momentary
power failure
Over-current
Over-voltage
Overload
a maximum of 10 consecutive retries
1st retry
: about 1 [s] after tripping
2nd retry
: about 2 [s] after tripping
3rd retry : about 3 [s] after tripping
10th retry : about 10 [s] after tripping
Retry is canceled if the inverter
trips again for reasons other than a
momentary power failure, over-
current, over-voltage or overload,
or if the inverter fails to restart
within the predetermined number
of retries.
Kinds of trips can be retried
Over-current
Overload of inverter
Over heat
Over-current of DC injection
Overload of motor
Over-voltage
Overload of braking resister
No retry is performed if the inverter trips for the following reasons:
,,: Arm short circuit : Interruption communication error
: Phase failure(input side) : Gate array fault
: Phase failure(output side) : Output current detector error
:
Loaded side over-current at start time
: Optional unit fault
, : Ground-fault : Flash memory fault
: Emergency stop : Sink/source switching error
: EEPROM error : Speed error (Over speed)
: Main RAM error : Key error
: Main ROM error
Others (other than the above)
: CPU fault
During a retry, the fault detection relay (FLA, B and C) is not active.
A virtual cooling time is set for trips due to an overload (,,). Therefore, a
retry is performed after a virtual cooling time and the retry time have passed.
In the case of a trip due to an over-voltage ( ), the inverter may trips again
unless the voltage in its D.C. section falls enough.
In the case of a trip due to overheating (), the inverter may trip again unless the
temperature inside it falls enough; the inverter monitors the temperature in it.
A retry is performed if is set enabled, even if the trip holding selection parameter
is set at .
During a retry, and the value selected with the status monitor selection
parameter are displayed alternately.
Function
The inverter automatically resets itself when it has tripped. During a retry, according to
the setting of (Auto-restart mode selection) the inverter automatically restarts
and this function makes smooth motor activation possible.