Mitsubishi Electric 800 Series Instruction Manual page 426

• The pre-charge function valid/invalid settings and pre-charge ending conditions are as follows:
Pr.127 setting
Pr.761 setting
9999 -
Other than 9999 9999
Other than 9999
*1 When two or more ends conditions are satisfied, the pre-charge operation ends by the first-satisfied condition.
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 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)
Pre-charge ending condition setting
Pr.762 setting
-
9999
Other than 9999
9999
Other than 9999
Measured value[PSI]
Pr.761
Ending level
Output frequency[Hz]
Pr.127
0 Hz
STF
Y49
Pre-charge
function
X77 signal
- Disabled
Not assigned
Assigned Enabled
Not assigned
Assigned
Not assigned
Assigned
Not assigned
Assigned
PID control
Valid pre-charge ending
*1
condition
-
- - X77
- Time -
- Time X77
Result - -
Result - X77
Result Time -
Result Time X77
Time
Time
5. PARAMETERS
5.11 (A) Application parameters
3
4
5
5
5
6
7
8
9
10
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