Mitsubishi Electric FR-F800, Instruction Manual

Page: 543 / 834

Parameters (A) Application parameters
FR-F800 5 - 381
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)
– 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.)
I002702E
Fig. 5-179: Pre-charge ending level (Pr. 761 ≠ 9999, Pr. 1132 = "9999")
I003047E
Fig. 5-180: Pre-charge ending level (Pr. 761 ≠ 9999, Pr. 1132
≠
"9999")
STF
Y49
PID control
Ending level
Measured value [PSI]
Pr. 761
Output frequency [Hz]
Pr. 127
Time
Time
0 Hz
STF
Y49
PID control
Ending level
Measured value [PSI]
Pr. 761
Output frequency [Hz]
Pr. 127
Time
Time
0 Hz
Target
Measured value