Mitsubishi Electric FR-D720S SC EC Instruction Manual page 289

Parameter
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 re-
tries 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 in Fig. 6-77.)
Use Pr. 68 to set the waiting time from when the inverter trips until a retry is made in the range
0.1s to 600s. (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
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 fail-
ure 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" (pos-
itive logic) or "164" (negative logic) to any of Pr. 190, Pr. 192 or Pr. 197.
Fig. 6-76: Retry success example
Fig. 6-77: Retry failure example
FR-D700 SC EC
Output frequency
Alarm occurrence
Retry success count
Output frequency
First
retry
Alarm
occurrence
Alarm signal
Operation setting at alarm occurrence
Retry success
Pr. 68 × 5
Retry start
Second Third
retry retry
Alarm Alarm
occurrence occurrence
Time
Success count + 1
I001178E
Time
Retry failure E.RET
I001179E
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