Mitsubishi F700 Series Instruction Manual page 282

(1) Operation selection for the pre-charge function
The pre-charge function ends when any of the following conditions is satisfied. It also ends when the start signal turns
OFF or the output is shutoff (except for the PID output suspension function (SLEEP)).
Measured
The measured amount reaches pre-charge ending level or higher.
amount
Time The pre-charge operation lasts pre-charge ending time or longer.
Signal The pre-charge end command (X77, X78) is input.
Using parameters, set the pre-charge ending conditions and the pre-charge function to be valid or invalid.
Pre-charge ending condition *
Pr. 127
PID control
Pr. 761
automatic
Pre-charge
switchover
ending level
frequency
9999 -
9999
Other than
9999
Other than
9999
* When two or more conditions are satisfied, the pre-charge operation ends by the first-satisfied condition.
 Starting the pre-charge operation
Pre-charge operation starts when a start command is given (after the PID output suspension (SLEEP) or the MRS
(output shutoff) signal cancellation) while the pre-charge operation is set active by parameters.
 Ending the pre-charge operation
The pre-charge operation ends and PID control starts when any of the ending conditions in the above table is satisfied.
REMARKS
 If the X77 or X78 signal is ON at start after the PID output suspension (SLEEP) or the output shutoff cancellation, PID control
starts without performing the pre-charge operation.
 PID output suspension (SLEEP) is not performed until the pre-charge operation ends.
 During the pre-charge operation, it is regarded as integrated value = estimated value. The motor speed may drop shortly from
the automatic switchover frequency depending on the parameter settings.
 Parameter changes and switchover to the second PID control are applied immediately. If PID control has not started when the
settings were changed, PID control starts with changed settings. (If PID control has already started, these settings do not apply.
If the changed settings already satisfy a condition to start PID control, the PID control starts as soon as these are changed. )
Pre-charge ending condition
Pre-charge
Pr. 762
end
Pre-charge
command
ending time
(X77)
- -
Not assigned
9999
Assigned
Not assigned
Other than
9999
Assigned
Not assigned
9999
Assigned
Not assigned
Other than
9999
Assigned
Related parameter
Pr. 761, Pr. 766
Pr. 762, Pr. 767
Pr. 178 to Pr. 189
Pre-charge
Valid pre-charge ending condition
function
Invalid
-
-
-
Measured
amount
Valid
Measured
amount
Measured
amount
Measured
amount
PID control
-
- X77
Time -
Time X77
- -
- X77
Time -
Time X77
4
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