Mitsubishi FR-A740-00023-EC - Operation Setting at Alarm Occurrence; Retry Function (Pr. 65, Pr. 67 to Pr. 69)

261
Operation setting at alarm occurrence
4
PARAMETERS
4.18 Operation setting at alarm occurrence
4.18.1 Retry function (Pr. 65, Pr. 67 to Pr. 69)
⋅ Retry operation automatically resets an alarm and
restarts the inverter at the starting frequency when the
time set in Pr. 68 elapses after the inverter stopped due
to the alarm.
⋅ Retry operation is performed by setting Pr. 67 to any
value other than "0". Set the number of retries at alarm
occurrence in Pr. 67.
⋅ When retries fail consecutively more than the number
of times set in Pr. 67 , a retry count excess alarm
(E.RET) occurs, stopping the inverter output.
(Refer to retry failure example)
⋅ Use Pr. 68 to set the waiting time from when an inverter
alarm 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 alarms occurring for more than four
times longer than the time set in Pr. 68 after a retry start.
⋅ 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) .
Purpose Parameter that must be Set
Refer to
Page
Recover by retry operation at alarm
occurrence
Retry operatoin Pr. 65, Pr. 67 to Pr. 69 261
Output alarm code from terminal Alarm code output function Pr. 76 263
Do not output input/output phase
failure alarm
Input/output phase failure
protection selection
Pr. 251, Pr. 872 264
The motor is decelerated to stop at
motor thermal activation
Fault definition Pr. 875 265
If an alarm occurs, the inverter resets itself automatically to restart. You can also select the alarm description 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 254 for the restart
function.)
Parameter
Number
Name
Initial
Value
Setting
Range
Description
65 Retry selection 0 0 to 5
An alarm for retry can be selected. (Refer to the next
page)
67
Number of retries at alarm
occurrence
0
0 No retry function
1 to 10
Set the number of retries at alarm occurrence.
An alarm output is not provided during retry operation.
101 to 110
Set the number of retries at alarm occurrence. (The
setting value of minus 100 is the number of retries.)
An alarm output is provided during retry operation.
68 Retry waiting time 1s 0 to 10s
Set the waiting time from when an inverter alarm occurs
until a retry is made.
69 Retry count display erase 0 0 Clear the number of restarts succeeded by retry.
CAUTION
When terminal assignment is changed using Pr. 190 to Pr.
196, the other functions may be affected. Please make
setting after confirming the function of each terminal.
Retry failure example
Inverter
output
frequency
Alarm
occurrence
First
retry
Alarm
occurrence
Second
retry
Alarm
occurrence
Third
retry
Retry failure
(E.RET)
ON
0
Alarm 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
Alarm occurrence
Retry success count
Retry start