Mitsubishi Electric FR-F820-00046 Instruction Manual page 428

NOTE
• 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 satisfies a condition to start PID control, the PID control starts as soon as these are
changed.)
• The pre-charge also ends when PID control is set to invalid, the start command has been turned OFF, and output has been
shut off.
 Example of the 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)
Measured value[PSI]
Pr.761
Output frequency[Hz]
Pr.127
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 switchover
frequency is reached until the pre-charge ends, the status is regarded as the one during pre-charge.)
Measured value[PSI]
Output frequency[Hz]
Ending level
0Hz
STF
Y49
Ending level
Pr.761
Target
Measured value
Pr.127
0Hz
STF
Y49
Time
PID control
Time
Time
PID control
Time
5.11 (A) Application parameters
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5. PARAMETERS