Operation Setting At Fault Occurrence; Retry Function (Pr. 65, Pr. 67 To Pr. 69) - Mitsubishi Electric FR-A720-00030-NA Instruction Manual

4.18 Operation setting at fault occurrence

Purpose
Recover by retry operation at fault
occurrence
Output fault code from terminal
Do not output input/output phase
failure alarm
The motor is decelerated to stop at
motor thermal activation

4.18.1 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 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 270 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
Retry success example
Pr.68
Pr.68
Inverter
output
frequency
0
Retry start
Fault occurrence
Retry success count
Y64 ON
Retry failure example
Pr.68
Inverter
output
frequency
0
First
retry Fault
Fault
occurrence occurrence
Fault signal
(ALM)
ON
Y64
Retry operation
Fault code output function
Input/output phase failure
protection selection
Fault definition
Initial
Value
0
0
1s
0
Retry success
5
Time
Success count + 1
Pr.68 Pr.68
Time
Second Third
retry Fault retry
Retry failure
(E.RET)
occurrence
ON
ON ON

Operation setting at fault occurrence

Parameter that must be Set
Pr. 65, Pr. 67 to Pr. 69
Pr. 251, Pr. 872
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
101 to 110 setting 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 to 10s
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 tripped due
to the fault.
 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, and the inverter trips.
(Refer to retry failure example)
 Use Pr. 68 to set the waiting time from when an inverter
fault occurs until a retry is made in the range 0 to 10s.
(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
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
logic)" or "164 (negative logic)" in any of Pr. 190 to Pr.
196 (output terminal function selection) .
CAUTION
When terminal assignment is changed using Pr. 190 to Pr.
196, the other functions may be affected. Set parameters
after confirming the function of each terminal.
Refer to
Page
277
Pr. 76 279
280
Pr. 875 281
Description
4
277