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Operation setting at fault occurrence
4
PARAMETERS
4.13 Operation setting at fault occurrence
4.13.1 Retry function (Pr. 65, Pr. 67 to Pr. 69)
⋅ Retry operation automatically resets a fault and
restarts the inverter at the starting frequency when the
time set in Pr. 68 elapses after the inverter 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 inverter trip.
(Refer to retry failure example)
⋅ Use Pr. 68 to set the waiting time from when the
inverter trips until a retry is made in the range 0 to 10s.
⋅ 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 set in Pr. 68 after a retry
start.
(When retry is successful, cumulative number of retry
failure is cleared.)
⋅ Writing "0" in 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)" in any of Pr.
190 to Pr. 196 (output terminal function selection) .
Purpose Parameter that must be Set
Refer to
Page
Recover by retry operation at fault
occurrence
Retry operation Pr. 65, Pr. 67 to Pr. 69 159
Output fault code from terminal Fault code output function Pr. 76 161
Do not input/output phase loss alarm
Input/output phase loss
protection selection
Pr. 251, Pr. 872 162
If a fault occurs, the inverter resets itself automatically to restart. You can also select the fault for a retry.
When automatic restart after instantaneous power failure is selected (Pr. 57 Restart coasting time ≠ "9999"), restart
operation is performed at retry operation as at an instantaneous power failure. (Refer to page 152 for the restart
function.)
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 to 10s
Set the waiting time from when an inverter 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 User group read selection = "0". (Refer to page 190)
CAUTION
Changing the terminal assignment using Pr. 190 to Pr. 196
(output terminal function selection) may affect the other
functions. Set parameters after confirming the function of
each terminal.
Retry failure example
Inverter
output
frequency
Fault
occurrence
First
retry
Fault
occurrence
Second
retry
Fault
occurrence
Third
retry
Retry failure
(E.RET)
ON
0
Fault signal
(ALM)
Pr.68
Pr.68 Pr.68
Time
Y64
ON ON ON
Inverter
output
frequency
0
Y64
Pr.68
Pr.68 5
Retry success
Retry success example
Success count + 1
Time
ON
Fault occurrence
Retry success count
Retry start