Mitsubishi Electric 800 Series Instruction Manual page 444

 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
Time
5. PARAMETERS
5.11 (A) Application parameters
3
4
5
5
5
6
7
8
9
10
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