Mitsubishi Electric FR-F820-00077 Instruction Manual page 580

(A) Application parameters
PID auxiliary pressure pump function (Pr. 1374 and Pr. 1375)
● This function enables signal output to activate an auxiliary pressure pump when the pump flow
rate is low in the system which constantly requires a high pressure.
● When the deviation exceeds the auxiliary pressure pump operation starting level (Pr. 1374
"Auxiliary pressure pump operation starting level" – 1000%) after the PID output suspension
function (sleep function) is activated, the auxiliary pressure pump starts and the auxiliary pressure
pump operation signal (Y226) turns ON.
● When the deviation falls below the auxiliary pressure pump operation stopping level (Pr. 1375
"Auxiliary pressure pump operation stopping level" – 1000%) during the auxiliary pressure pump
operation, the auxiliary pressure pump stops.
● For the Y226 signal, set "226 (positive logic)" or "326 (negative logic)" in any of Pr. 190 to Pr. 196
(output terminal function selection) to assign the function.
For reverse action
Fig. 5-198:
NOTES The recommended settings of Pr. 577 (Pr. 1149), Pr. 1374, and Pr. 1375 are as follows:
Pr. 577 (Pr. 1149) > Pr. 1374 > Pr. 1375
Even when the inverter emergency stop operation (output shutoff by the MRS signal, etc.) is per-
formed, the PID auxiliary pressure pump function operation continues while the power is supplied
to the control circuit. For the emergency stop operation, configure another circuit to stop the aux-
iliary pressure pump.
Changing the terminal assignment using Pr. 190 to Pr. 196 (output terminal function selection)
may affect the other functions. Set parameters after confirming the function of each terminal.
5 - 408
Measured value
Set point
Deviation value
Pr. 577 (Pr. 1149) –1000
Pr. 1374 – 1000
Pr. 1375 –1000
0
Output frequency
Pr. 576
(Pr. 1148)
(Pr.1147) (Pr.1147)
SLEEP (SLEEP2)
Y226
PID auxiliary pressure pump function
Pr. 575
Pr.575 Pr.575
(Pr. 1147)
ON
ON
Parameters
Time
ON
I003064E