4.14 Operation Setting At Fault Occurrence; Retry Function (Pr.65, Pr.67 To Pr.69) - Mitsubishi Electric FR-E700EX Instruction Manual

Operation setting at fault occurrence

4.14 Operation setting at fault occurrence

Purpose
To recover by retry operation at
fault occurrence
To disable output input/output
phase loss alarm
To detect an earth (ground) fault at
start
To detect motor overspeed

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

If a fault occurs, the drive unit resets itself automatically to restart. You can also select the fault for a retry.
Parameter
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 182)
Retry success example
(If it is below 3.1s, 3.1s is set.)
Pr.68
Motor rotation
speed
0
Retry start
Fault occurrence
Retry success count
ON
Y64
Retry failure example
Pr.68
Motor rotation
speed
0
First retry
Fault Fault
occurrence occurrence
Fault signal
(ALM)
ON
Y64
164
Retry operation
Input/output phase failure
protection selection
Earth (ground) fault
detection at start
Overspeed detection level
Initial
Name
value
0
0
1s
0
Retry success
4
Pr.68
Time
Success count + 1
Pr.68 Pr.68
Second retry Third retry
Retry failure
Fault (E.RET)
occurrence
ON
ON ON
Parameter to set
Pr.65, Pr.67 to Pr.69
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 a drive unit fault occurs until
0.1 to 360s
a retry is made.
0 Clear the number of restarts succeeded by retry.
 Retry operation automatically resets a fault and restarts
the drive unit at the starting speed when the time set in
Pr.68 elapses after the drive unit 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 drive unit trip. (Refer to retry failure
example)
 Use Pr.68 to set the waiting time from when the drive unit
trips until a retry is made in the range 0.1 to 360s.
 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 (3.1s at shortest) set in Pr.68
after a retry start. (When retry is successful, cumulative
number of retry failure is cleared.)
Time
 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 any of Pr.190 to Pr.192
(output terminal function selection).
Pr.251, Pr.872
Pr.249
Pr.374
Description
Refer to page
164
166
166
167