Mitsubishi Electric FR-F820-00077 Instruction Manual page 560

(A) Application parameters
● When the elapsed time reaches the pre-charge ending time (Pr. 762 "Pre-charge ending time" ≠
"9999")
The pre-charge operation ends when the pre-charge time reaches the Pr. 762 setting or higher,
then the PID control is performed.
Fig. 5-181:
● When the signal is input to end the pre-charge operation
When the X77 signal turns ON, the pre-charge operation ends, and the PID control starts. (If a start
command is given while the X77 signal is ON, the pre-charge operation is not performed, and PID
control starts.)
Fig. 5-182:
NOTES When the PID output suspension (SLEEP) function is in use, and the X77 signal is set to valid after
this function is released, set the X77 signal to OFF after checking that the during pre-charge oper-
ation signal (Y49) is OFF.
When the PID output suspension (SLEEP) function is in use, and PID control is to be performed
immediately after this function is released, leave the X77 signal ON until PID control ends.
When the pre-charge operation is valid, the pre-charge operation is performed at the output shut-
off cancellation (MRS signal, etc.). (The pre-charge operation is also performed in the case of
instantaneous power failure when the automatic restart after instantaneous power failure is valid.)
When the control method is changed to PID control from a control with higher priority in fre-
quency command (multi-speed setting, Jog operation, etc.), the motor is accelerated/decelerated
until its speed reaches the automatic switchover frequency (Pr. 127), and the pre-charge is per-
formed.
5 - 388
Output frequency [Hz]
Pr. 127
Ending time
0 Hz
STF
Y49
Pre-charge ending time (Pr. 762 ≠ 9999)
Output frequency [Hz]
Pr. 127
0 Hz
STF
X77
Y49
Assignment of signal X77 (Pr. 178 to Pr. 189)
PID control
PID control
10 ms or more
Parameters
Time
I002703E
Time
I002701E