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Trip-less Intensification; Retry Function - Toshiba Tosvert VF-AS1 Instruction Manual

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6.14

Trip-less intensification

6.14.1 Retry function

 : Retry selection (selecting the no. of times)
• Stand clear of motors and equipment.
The motor and equipment stop when the alarm is given, selection of the retry function will restart them
suddenly after the specified time has elapsed. This could result in unexpected injury.
• Take measures for safety, e.g. attach a cover to the motor, to prevent accidents if the motor suddenly
Mandatory
restarts.
Function
This parameter resets the inverter automatically when the inverter gives a trip. During the retry mode, the
motor speed search function operated automatically as required and thus allows smooth motor restarting.
[Parameter setting]
Title

The likely causes of tripping and the corresponding retry processes are listed below.
Cause of tripping
Momentary power failure
6
Overcurrent
Overvoltage
Overload
Trips covered by the retry function
• , , 
• , ,  : Overcurrent in DC section or
• , , 
The retry function is disabled in the following unusual events:
• , ,  : Arm overcurrent at start-up
• 
• 
• 
• 
• 
• 
• 
• ,  : Ground fault
• 
Protective operation detection relay signals (FLA, FLB, FLC terminal signals) are not sent during use of the retry
function. (factory default setting)
A virtual cooling time is provided for overload tripping (, , ).
 See Section 13.2 for the virtual cooling time.
In this case, the retry function operates after the virtual cooling time and retry time.
In the event of overvoltage tripping (~), re-tripping may result unless the DC voltage decreases below a
predetermined level.
In the event of overheating-caused tripping (), re-tripping may result unless the internal temperature decreases
below a predetermined level, since the internal temperature detection function of the inverter works.
Even when trip retention selection parameter () is set to , the retry function is enabled by  setting.
Function
Retry selection (selecting the no. of times)
Retry process
Up to 10 times in succession
1st retry : About 1 sec after tripping
2nd retry : About 2 sec after tripping
3rd retry : About 3 sec after tripping
10th retry : About 10 sec. after tripping
: Overcurrent
overheating of devices
: Overvoltage
: Input phase failure
: Output phase failure
: Loaded side overcurrent at start time
: External thermal error
: Low current
: Voltage drop in main circuit
: Overtorque
: Emergency stop
Caution
Adjustment range
: Deselect, ~ times
The retry function will be canceled at once
if tripping is caused by an unusual event
other than momentary power failure,
overcurrent, overvoltage or overload.
This function will also be canceled if a
...
retry is not successful within the specified
number of times.
• : Inverter overload
• : Motor overload
• : Braking resistor
overload
• , ,  : EEPROM error
• 
: Main RAM error
• 
: Main ROM error
• 
: CPU trip
• 
: Interruption of operation command from
external control device
• 
: Gate array fault
• 
: Output current detector error
• 
: Optional unit fault
• ~
• Others (Other than trips covered by the retry function)
F-24
E6581442
Default setting
Canceling conditions
• 
: Overheat
•  : PM motor step-out

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