Retry Function - Toshiba Tosvert VF-S15 Instruction Manual

6.19.3 Retry function

f303 : Retry selection (number of times)
 Stand clear of motors and equipment.
If 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.
Mandatory  Attach caution label about sudden restart in retry function on inverters, motors and equipment for
action
prevention of accidents in advance.
 Function
[Parameter setting]
Title
f303
6
The likely causes of tripping and the corresponding retry processes are listed below.
Cause of tripping
Overcurrent
Overvoltage
Overload
Overheating
Step-out (for PM
motor only)
● Retry is done only when the following trips occur.
oc1, oc2, oc3, op1, op2, op3, ol1, ol2, ol3, oh, sout
● Protective operation detection relay signals (FLA, FLB, FLC terminal signals) are not sent during use of
the retry function. (Default setting)
● To allow a signal to be sent to the protective action detection relay (FLA, B and C terminals) even during
the retry process, assign function numbers 146 or 147 to f132.
● A virtual cooling time is provided for overload tripping (ol1, ol2).
In this case, the retry function operates after the virtual cooling time and retry time elapsed.
● In the event of tripping caused by an overvoltage ( to ), the retry function will not be activated
until the voltage in the DC section comes down to a normal level.
● In the event of tripping caused by overheating (), the retry function will not be activated until the
temperature in the inverter is lowered enough for restarting operation.
● During retrying, rtry and the monitor display specified by Initial panel display selection parameter,
f710, are displayed alternately.
● The number of retries will be cleared if the inverter is not tripped for the specified period of time after a
successful retry.
"A successful retry" means that the inverter output frequency reaches the frequency command value
without causing the inverter to re-trip.
This parameter resets the inverter automatically when the inverter gives an alarm. During the retry
mode, the motor speed search function operates automatically when necessary and thus allows
smooth motor restarting.
Function
Retry selection (number 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
Caution
Adjustment range
0: Disabled, 1-10 (Times)
The retry function will be canceled at once if
tripping is caused by an unusual event other
than: overcurrent, overvoltage, overload,
overheating, or step-out.
This function will also be canceled if retrying
is not successful within the specified number
of times.
F-68
E6582175
Default setting
0
Canceling conditions