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Operation setting at fault occurrence
4.14 Operation setting at fault occurrence
4.14.1 Retry function (Pr.65, Pr.67 to Pr.69)
Retry operation automatically resets a fault and restarts
the drive unit at the starting speed when the time set in
Pr.68 elapses after the drive unit is tripped.
Retry operation is performed by setting Pr.67 to any value
other than "0". Set the number of retries at fault
occurrence in 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 drive unit trip. (Refer to retry failure
example)
Use Pr.68 to set the waiting time from when the drive unit
trips until a retry is made in the range 0.1 to 360s.
Reading the Pr.69 value provides the cumulative number
of successful restart times made by retry.
The cumulative count in Pr.69 is increased by 1 when a
retry is regarded as successful after normal operation
continues without faults occurring for more than four
times longer than the time (3.1s at shortest) set in Pr.68
after a retry start. (When retry is successful, cumulative
number of retry failure is cleared.)
Writing "0" to Pr.69 clears the cumulative count.
During a retry, the Y64 signal is ON. For the Y64 signal,
assign the function by setting "64 (positive operation)" or
"164 (negative operation)" to any of Pr.190 to Pr.192
(output terminal function selection).
Purpose Parameter to set Refer to page
To recover by retry operation at
fault occurrence
Retry operation Pr.65, Pr.67 to Pr.69
164
To disable output input/output
phase loss alarm
Input/output phase failure
protection selection
Pr.251, Pr.872
166
To detect an earth (ground) fault at
start
Earth (ground) fault
detection at start
Pr.249
166
To detect motor overspeed Overspeed detection level Pr.374
167
If a fault occurs, the drive unit resets itself automatically to restart. You can also select the fault for a retry.
Parameter
number
Name
Initial
value
Setting
range
Description
65 Retry selection
0 0 to 5 A fault for retry can be selected. (Refer to the next page)
67
Number of retries at fault
occurrence
0
0 No retry function
1 to 10
Set the number of retries at fault occurrence.
A fault output is not provided during retry operation.
101 to 110
Set the number of retries at fault occurrence. (The setting
value of minus 100 is the number of retries.)
A fault output is provided during retry operation.
68 Retry waiting time
1s 0.1 to 360s
Set the waiting time from when a drive unit fault occurs until
a retry is made.
69 Retry count display erase
0 0 Clear the number of restarts succeeded by retry.
The above parameters can be set when Pr.160 Extended function display selection = "0". (Refer to page 182)
Retry failure example
Fault
occurrence
Fault
occurrence
Fault
occurrence
First retry Second retry Third retry
Retry failure
(E.RET)
ON
0
Fault signal
(ALM)
Pr.68 Pr.68 Pr.68
Y64
ON ON ON
Motor rotation
speed
0
Y64
Pr.68
Retry success
Retry success example
Success count + 1
Time
ON
Fault occurrence
Retry success count
Retry start
Time
Pr.68 4
(If it is below 3.1s, 3.1s is set.)
Motor rotation
speed