Mitsubishi Electric FR-F820-00046 Instruction Manual page 38

Pr. Name
1377 PID input pressure
A452 selection
1378 PID input pressure
A453 warning level
1379 PID input pressure fault
A454 level
PID input pressure
1380
warning set point change
A455
amount
1381 PID input pressure fault
A456 operation selection
PID output hold (Pr.1361 and Pr.1362)
• The manipulated amount (PID output) can be fixed when the fluctuation of the deviation is small. This function
eliminates unnecessary acceleration/deceleration, which is effective to reduce the power consumption.
• When the deviation falls within the Pr.1362 PID output hold range and the elapsed time exceeds the Pr.1361
Detection time for PID output hold, the manipulated amount (PID output) is fixed at the output frequency at that
time.
• Even if the deviation falls out of the PID output hold range, the manipulated amount (PID output) is kept during the
detection time for PID output hold.
Detection time for PID output hold
Output value
Set point
Measured value
Manipulated
amount
NOTE
• While the PID output is held, calculation is not performed for the P term, I term, and D term. For the P and I terms,
the values at the start of the holding period are kept. The D term is set to "0".
• When the control switches between the first PID control and second PID control, the PID output holding state is
canceled.
• The PID output holding function is disabled in the following cases:
When Pr.1362="9999", while the PID setting is not applied to the frequency, during the sleep function, at switching
to the auxiliary motor in the multi-pump function, during PID gain tuning, and during the sleep boost.
Initial Setting
value range
1
2
9999
3
9999
20% 0 to 100%
0 to 100%
9999
9999
5% 0 to 100%
0
0
1
(Pr.1361)
Deviation
PID output is held.
Description
Terminal 1 pressure input
Terminal 2 pressure input
Terminal 4 pressure input
The PID input pressure control function is disabled.
Set the input pressure warning level.
Set the input pressure fault level.
The input pressure fault detection is disabled.
Set the set point change amount when the pressure
reaches the input pressure warning level.
The protective function (E.PID) for the input pressure
fault is activated.
A deceleration stop is performed when the input
pressure fault occurs.
Detection time for PID output hold
(Pr.1361)
4
PID output hold range (Pr.1362)
Time
Time
BCN-C22005-703
Refer
to
page
11