Mitsubishi Electric FR-F820-00077 Instruction Manual page 585

Parameters
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
1
2
3
9999 (Initial value)
Tab. 5-197: Settings of Pr. 1377
● 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 signal (Y229) 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) for changing the set point by the Pr. 1380 setting value in Pr. 1373 "PID measured
value control set point change rate". When the input pressure 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 signal (Y230) is output.
● Select the operation for the abnormal input pressure in Pr. 1381.
Pr. 1381 setting
0 (Initial value)
1
Tab. 5-198: Settings of Pr. 1381
● For the Y229 and Y230 signals, assign the functions to output terminals using the Pr. 190 to Pr. 196
(output terminal function selection).
Output signal
Y229
Y230
Tab. 5-199: Signal assignment of Y229 and Y230
● To monitor the input pressure, set "69" in the monitor selection parameters. (0.1% increments)
Monitor type
PID input pressure
value
Tab. 5-200: PID input pressure monitor
FR-F800
Pressure input terminal
Terminal 1
Terminal 2
Terminal 4
The PID input pressure control function is
disabled.
Operation for the abnormal input pressure
Output shutoff by the protective function
(E.PID) activation
Deceleration stop (Operation can be restarted
when the input pressure returns to normal.)
Parameter setting
Pr. 52,
Pr. 774 to Pr. 776, Pr. 54
and Pr. 992 (Terminal FM/CA
(Operation panel output)
indication)
69 69
Remarks
Set Pr. 868="0 (initial value)".
—
Set Pr. 858="0 (initial value)".
—
Y230 signal
The signal is output at the same time with the
protective function.
The signal is output after a deceleration stop.
Pr. 190 to Pr. 196 setting
Positive logic
229
230
Pr. 158 communication
(Terminal AM
output)
(hexadecimal)
69
(A) Application parameters
Negative logic
329
330
Communication monitor code
RS-485
MODBUS® RTU
dedicated
real time monitor
monitor
H45 40269
5 - 413