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3.4.17 Retry function (Pr. 65, Pr. 67 to Pr. 69)
Retry operation automatically resets a fault and restarts
the converter when the time set in
Pr. 68
elapses after the
converter trip.
Retry operation is performed when
Pr. 67
"0". Set the
number of retries at a fault occurrence to
Pr. 67
.
When retries fail consecutively more than the number of
times set in
Pr. 67
, a retry count excess fault (E.RET)
occurs, resulting in a converter trip. (Refer to the Retry
failure example.)
Use
Pr. 68
to set the waiting time from when the converter
trips until a retry is made in the range of 0 to 360s. (When
the setting value is "0s", the actual time is 0.1s.)
Reading the
Pr. 69
value provides the cumulative number
of successful restart times made by retries.
The cumulative count in
Pr. 69
increases by 1 when a retry
is successful. Retry is regarded as successful when
normal operation continues without a fault for the
Pr. 68
setting multiplied by four or longer (6s at the shortest).
(When retry is successful, cumulative number of retry
failure is cleared. )
Writing "0" in
Pr. 69
clears the cumulative count.
During a retry, RTY signal is ON. For RTY signal, assign
the function by setting "11 (positive logic)" or
"111(negative logic)" in any of
Pr. 11 to Pr. 16 (output
terminal function selection)
.
If a fault occurs, the converter resets itself automatically to restart. Fault-activating retries can be also selected.
Parameter
Number
Name
Initial value
Setting range
Description
65
Retry selection
0
0 to 4
A fault for retry can be selected.
(Refer to the
table in the next page.)
67
Number of retries at fault
occurrence
0
0
No retry function
1 to 10
Set the number of retries at a fault
occurrence.
A fault output is not provided during the retry
operation.
101 to 110
Set the number of retries at a fault
occurrence. (The setting value minus 100 is
the number of retries.)
A fault output is provided during the retry
operation.
68
Retry waiting time
1s
0 to 360s
Set the waiting time from when a converter
fault occurs until a retry is made.
69
Retry count display erase
0
0
Clear the number of restarts succeeded by
retries.
NOTE
Changing the terminal assignment using
Pr. 11 to
Pr. 16 (output terminal function selection)
may affect
other functions. Set parameters after confirming
the function of each terminal.
Converter
operation
ON
0
Pr. 68
Pr. 68
Pr. 68
RTY
ON
ON
ON
Converter
operation
0
RTY
Pr. 68
× 4
(If it is below 6s, 6s is set.)
ON
Retry success example
Retry success
Retry start
Fault occurrence
Success count + 1
Time
Retry success count
Retry failure example
Fault
occurrence
Fault
occurrence
Fault
occurrence
First
retry
Second
retry
Third
retry
Fault signal
(ALM)
Retry failure
(E.RET)
Time
Pr. 68
HC2.book 91 ページ ２０１２年１１月１９日 月曜日 午前１０時５２分
