Toshiba TOSVERT VF-A7, Instruction Manual

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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.