Mitsubishi Electric FR-F820-00046 Instruction Manual page 41

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
Pr.577 (Pr.1149) - 1000
Output frequency
SLEEP (SLEEP2)
NOTE
• 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 performed, 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 auxiliary 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.
Measured value
Set point
Deviation value
Pr.1374 - 1000
Pr.1375 - 1000
0
Pr.576
(Pr.1148)
Pr.575 Pr.575 Pr.575
(Pr.1147) (Pr.1147) (Pr.1147)
Y226
ON
ON ON
7
Time
BCN-C22005-703