Parker PQDXXA-Z10 - PID Parameter Setting

35
Digital Pump Control Module
Series PQDXXA-Z10
Installation and Setup Manual
Bulletin HY30-3255-INST/UK
Parker Hannifin Manufacturing Germany GmbH & Co. KG
Pump&MotorDivisionEurope
Chemnitz, Germany
6.4 PID Parameter Setting
Displacement and pressure control have separate control loops, whose parameters need to be set
separately. The pressure control should be focused on, since the system behaviour is depending on
hydraulic capacities, the way of piping to the hydraulic load and the varying hydraulic working points.
The displacement control should only be tuned again in case of system instabilities.
Theparameterofproportional-,integralanddifferentialactionshouldbeadjustedintherangesshown
below. The setting for the pressure control can also be beyond these points depending on the system.
Control Type Action Typical Ranges Tendency
Minimal Value
FD* / UD* (FP* /
UP*)
Maximal Value
FD* / UD* (FP* /
UP*)
Pressure P 10 200
Depending on hydraulic system!
I 150 -
D 0 200
Displace-
ment
P 50 (80) 3000 (800) Proportional to the pump displace-
ment.
I V
g
< 92 cm
3
/rev.
 200 (1500)
V
g
≥ 92 cm
3
/rev.
 80 (300)
V
g
< 32 cm
3
/rev.
 -
V
g
≥ 32 cm
3
/rev.
 -
Only linearity errors of the displace-
ment valve are compensated.
Bigger displacements can be param-
eterized with smaller I-gain without
gettingsystemstabilityintojeopardy.
D 0 1200 (600)
Recommendation for the PID parameter setting:
Preparations:
 •SetPactiontosmallvalue.
 •SetIactiontoveryhighvalue.
 •SetDactiontozero.
PID Setting:
 • IncreasePuntilaacceptablecommandresponseisachieved.
 • DecreaseIuntilaacceptableerrorbetweencommandandactualvalueisachieved.
 • IncreaseDuntilaacceptabledynamicandacceptablerippleisachievedinthecommandresponse.