Mitsubishi Electric FR-F820-00046 Instruction Manual page 446

 PID input pressure control (Pr.1370, Pr.1373, and Pr.1377 to Pr.1381)
• In order to prevent air intake and cavitation inside the pump, this function controls the pump inlet pressure so that there is
no water shortage.
• To enable the PID input pressure control function, set the terminal for the pressure input in Pr.1377 PID input pressure
selection. (Select a terminal different from the one used for inputting the set point, measured value, or deviation.)
Pr.1377 setting Pressure input terminal
1 Terminal 1
2 Terminal 2
3 Terminal 4
The PID input pressure control
9999 (initial value)
function is disabled.
• When the input pressure measured at the inlet remains lower than the Pr.1378 PID input pressure warning level for the
time set in Pr.1370 Detection time for PID limiting operation, the PID input pressure warning (Y229) signal is output.
Also, the set point is changed by the amount set in Pr.1380 PID input pressure warning set point change amount.
• Set the rate (%/s) in Pr.1373 PID measured value control set point change rate for changing the set point by the
Pr.1380 setting value. When the input pressure value falls within the normal range, the set point returns to its original value.
• When the input pressure measured at the inlet remains lower than the Pr.1379 PID input pressure fault level for the time
set in Pr.1370 Detection time for PID limiting operation, the operation for the abnormal input pressure starts and the
PID input pressure fault (Y230) signal is output.
• Select the operation for the abnormal input pressure in Pr.1381.
Pr.1381 setting Operation for the abnormal input pressure
0 (initial value) Output shutoff by the protective function (E.PID) activation
Deceleration stop (Operation can be restarted when the input
1
pressure returns to normal.)
• For the Y229 and Y230 signals, assign the functions using Pr.190 to Pr.196 (Output terminal function selection).
Output signal
Y229
Y230
• To monitor the input pressure, set "69" in the monitor selection parameters. (0.1% increments)
Pr.52, Pr.774 to
Monitor item
Pr.776, and Pr.992
(Operation panel
PID input pressure value 69
Set Pr.868 = "0 (initial value)".
—
Set Pr.858 = "0 (initial value)".
—
Pr.190 to Pr.196 setting
Positive logic
229
230
Parameter Setting
Pr.54 (Terminal FM/CA
output)
indication)
69
Remarks
The signal is output at the same time with the
protective function.
The signal is output after a deceleration stop.
Negative logic
329
330
Communication monitor code
Pr.158 (Terminal AM communication
output) dedicated monitor
(hexadecimal)
69 H45
Y230 signal
RS-485
MODBUS RTU
real time
monitor
40269
5. PARAMETERS
5.11 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
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