Mitsubishi Electric FR-F820-00077 Instruction Manual page 559

Parameters
Example of pre-charge operation
● When the measured amount reaches the pre-charge ending level (Pr. 761 "Pre-charge ending
level" ≠ "9999")
The pre-charge operation ends when the measured value reaches the Pr. 761 setting or higher,
then the PID control is performed.
– When Pr. 1132 "Pre-charge change increment amount" = "9999" (horizontal pumps)
Fig. 5-179:
– When Pr. 1132 "Pre-charge change increment amount" ≠ "9999" (vertical pumps)
PID control is performed so that the change increment amount of the set point equals the
Pr.1132 setting after the automatic switchover frequency is reached until the pre-charge
ending condition is satisfied. (Although PID control is performed after the automatic switcho-
ver frequency is reached until the pre-charge ends, the status is regarded as the one during
pre-charge.)
Fig. 5-180:
FR-F800
Measured value [PSI]
Pr. 761
Ending level
Output frequency [Hz]
Pr. 127
0 Hz
STF
Y49
Pre-charge ending level (Pr. 761 ≠ 9999, Pr. 1132 = "9999")
Measured value [PSI] Ending level
Pr. 761
Target
Measured value
Output frequency [Hz]
Pr. 127
0 Hz
STF
Y49
Pre-charge ending level (Pr. 761 ≠ 9999, Pr. 1132
(A) Application parameters
Time
PID control
Time
Time
PID control
Time
≠
"9999")
I002702E
I003047E
5 - 387