Operation Setting At Fault Occurrence; Retry Function (Pr. 65, Pr. 67 To Pr. 69) - Mitsubishi Electric FR-D720-0.4K Instruction Manual

4.13 Operation setting at fault occurrence

Purpose
Recover by retry operation at fault
occurrence
Do not output input/output phase
failure alarm
Detect an earth (ground) fault at
start

4.13.1 Retry function (Pr. 65, Pr. 67 to Pr. 69)

If a fault occurs, the inverter resets itself automatically to restart. You can also select the fault for a retry.
When you have selected automatic restart after instantaneous power failure (Pr. 57 Restart coasting time ≠ 9999), restart
operation is performed at the retry operation time which is the same of that of a power failure. (Refer to page 137 for the
restart function.)
Parameter
Name
Number
65 Retry selection
Number of retries at fault
67
occurrence
68 Retry waiting time
69 Retry count display erase
The above parameters can be set when Pr. 160 Extended function display selection = "0". (Refer to page 163)
Retry success example
Pr. 68
Pr. 68
Inverter output
frequency
0
Retry start
Fault occurrence
Retry success count
ON
Y64
Retry failure example
Pr. 68 Pr. 68
Inverter output
frequency
0
First retry Second retry
Fault Fault
occurrence occurrence
Fault signal
(ALM)
ON
Y64
Retry operation
Input/output phase failure
protection selection
Earth (ground) fault
detection at start
Initial
Value
0
0
1s
0
Retry success
5
Time
Success count + 1
Pr. 68
Time
Third retry
Retry failure
Fault (E.RET)
occurrence
ON
ON ON

Operation setting at fault occurrence

Parameter that should be Set
Pr. 65, Pr. 67 to Pr. 69
Pr. 251, Pr. 872
Pr. 249
Setting
Range
0 to 5 A fault for retry can be selected. (Refer to the next page)
0 No retry function
Set the number of retries at fault occurrence.
1 to 10
A fault output is not provided during retry operation.
Set the number of retries at fault occurrence. (The setting
101 to 110 value of minus 100 is the number of retries.)
A fault output is provided during retry operation.
Set the waiting time from when an inverter fault occurs
0.1 to 600s
until a retry is made.
0 Clear the number of restarts succeeded by retry.
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 equal to or 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 of 0.1 to 600s.
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" 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 Pr. 190, Pr. 192 or Pr. 197
(output terminal function selection) .
Refer to Page
145
147
147
Description
145
4