Mitsubishi Electric FR-F800, Инструкция по эксплуатации

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Parameters (A) Application parameters
FR-F800 5 - 407
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.)
●
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.
●
For the Y229 and Y230 signals, assign the functions to output terminals using the Pr. 190 to Pr. 196
(output terminal function selection).
●
To monitor the input pressure, set "69" in the monitor selection parameters. (0.1% increments)
Pr. 1377 setting Pressure input terminal Remarks
1 Terminal 1 Set Pr. 868="0 (initial value)".
2 Terminal 2 —
3 Terminal 4 Set Pr. 858="0 (initial value)".
9999 (Initial value)
The PID input pressure control function is
disabled.
—
Tab. 5-197: Settings of Pr. 1377
Pr. 1381 setting Operation for the abnormal input pressure Y230 signal
0 (Initial value)
Output shutoff by the protective function
(E.PID) activation The signal is output at the same time with the
protective function.
1
Deceleration stop (Operation can be restarted
when the input pressure returns to normal.)
The signal is output after a deceleration stop.
Tab. 5-198: Settings of Pr. 1381
Output signal
Pr. 190 to Pr. 196 setting
Positive logic Negative logic
Y229 229 329
Y230 230 330
Tab. 5-199: Signal assignment of Y229 and Y230
Monitor type
Parameter setting Communication monitor code
Pr. 52,
Pr. 774 to Pr. 776,
and Pr. 992
(Operation panel
indication)
Pr. 54
(Terminal FM/CA
output)
Pr. 158
(Terminal AM
output)
RS-485
communication
dedicated
monitor
(hexadecimal)
MODBUS RTU
real time monitor
PID input pressure
value
69 69 69 H45 40269
Tab. 5-200: PID input pressure monitor