P/Q Closed Loop - Moog RKP-D User Manual

7 Pump functions

7.2.7 p/Q closed loop

The p/Q controller (control mode = 5) is a combination of the pressure and volume-flow functions, i.e., it en-
ables regulation of the volume flow resp. pressure.
In the p/Q closed loop, a pressure and a position are provided as a setpoint and the actual pressure (0x6381)
and the position (0x6301) are measured.
Figure 39, page 94
The pressure controller output value (0x2418) is compared with the pump position controller output (0x2158).
The lower of these demand values is forwarded to the position controller.
The p/Q controller makes the transition between position controller and pressure controller automati-
cally.
Status word bits
There are two status word bits which provide information whether the p/Q control type is active and if a control
fault is detected:
• Bit 8 - Pressure controller effective
This status word bit is set, if, and only if, the p/Q control type is active.
• Bit 11 - Control error
The control error bit in the status word is formed from the linking of the two controller deviations for pres-
sure and position. If this bit is set, a controller error is detected.
Chapter "5.3.5 Object 0x6041: Status word", page 29
Chapter "7.2.2 Monitoring", page 77
Description of the position and pressure controller parameters as well as the control monitoring functions:
Chapter "7.2.4 Control position closed loop", page 81
Chapter "7.2.6 Pressure control closed loop", page 85
© Moog GmbH USER MANUAL Firmware RKP-D (B99224-DV007-CE400; Version 1.1, 09/08)
Controller
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