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Bulletin Hy11 PVI017-45/GB

Installation and setupmanualElectro-hydrauliccontrol for PV seriesPump design series ≥≥≥≥≥ 45, PVpluscompensator design series ≥≥≥≥≥ 45

Variable displacementaxial piston pump

Parker Hannifin GmbH & Co KGPump & Motor DivisionNeefestr. 9609116 Chemnitz, GermanyTel.: +49 (0)371-3937-0Fax: +49 (0)371-3937-170www.parker.com

Copyright © 2005 by Parker Hannifin GmbH & Co KG

2

Electro hydraulic proportional controls version 45 foraxial piston pumps, PV seriesInstallation and setup manual

Parker Hannifin GmbH & Co KGPump & Motor Division

contents page

1. Proportional displacement control, code ...FPV 3

2. Proportional displacement control with pressure compensation,codes ...UPR, ...UPD and ...UPZ 5

3. Proportional displacement control with closed loop pressurecontrol, code ...UPG 8

4. Preload valve for proportional controlled pumps, code PVAPVV* 11

5. External pilot pressure supply 13

6. Quick pressure relief with quick unload valve, code PVAPSE*in combination with compensator codes ...UPS resp. ...UPT 14

7. Preload and quick unload manifold PVAPVE* in combinationwith compensator code ...UPT resp. ...UPE 16

8. Basic compensator adjustment 18

9. Electrical connections and wiring of compensator and controlelectronics 20

Notes:

the compensator / control ordering codes shown represent the last three digits in thepump ordering code (digits 13 to 15).

Setup manual for electro hydraulic proportional controls foraxial piston pumps, PV family

Note

This document and other information from Parker Hannifin GmbH, its subsidiaries, sales officesand authorized distributors provide product or system options for further investigation by usershaving technical expertise. Before you select or use any product or system it is important thatyou analyse all aspects of your application and review the information concerning the product orsystem in the current product catalogue. Due to the variety of operating conditions and applicationsfor these products or systems, the user, through his own analysis and testing, is solely responsiblefor making the final selection of the products and systems and assuring that all performanceand safety requirements of the application are met. The products are subject to change byParker Hannifin GmbH at any time without notice.

3Parker Hannifin GmbH & Co KG

Pump & Motor Division


1. Proportional displacementcontrol, code ...FPV

The proportional displacement control allowsa continuous variation of the pumpdisplacement according to an electrical inputcommand. Figure 1 shows the circuit diagramof a pump with this control.

figure 1: circuit diagram of the ...FPV control

An inductive position transducer (LVDT)measures the position of the servo piston andprovides an information on the actual dis-placement (signal, displacement) to a controlelectronic. The servo piston is kept by theservo spring and the pump outlet pressure onits annulus area at maximum displacement.The larger piston area is pressurized by thecontrol valve.

The control valve contains a control spool,which is moved by a spring and a proportionalsolenoid into its control position. The controlspool provides a pressure divider circuit incombination with the control orifice DB betweencontrol port A and return port L. This pressuredivider circuit controls the pressure pA.According to the area ratio of the servo piston,the control pressure pA is approximately 25 %of the pump outlet pressure p1.

The ordering code for a single control valveis: PVCF*PV**.

the first * indicates the pump size:A stands for PV016 - PV046C stands for PV063 - PV092E stands for PV140 - PV270

the two * at the end indicate seal option andscrews option (details see compensator spa-re parts list PVI-PVC).

At nominal current to the solenoid (1,3 A)the control spool is moved against the springand connects control port A with the pump case(port L). The pump is working with fulldisplacement, set by the displacementadjustment screw.

At no current to the solenoid the controlspool is moved by the spring against the sole-noid and connects control port A with the pumpoutlet. The pump outlet pressure p1 on thelarge servo piston area downstrokes the pumpto minimum displacement. That requires apump outlet pressure p1 of at least 15 bar.

If this pressure can not be maintained,special measures for a proper displacementcontrol are required (see chapter 4 and 5).Without an appropriate load pressure thepump will stay at full displacement.

displacement control valve,code PVCF*PV**

signal,displacement

pressure p1

flow

Q

displacement

solenoid current, displacement control valve

4



To control the proportional solenoid anelectronic module is offered. The orderingcode for this module is: PQDXXA-Z00. Thismodule is able to control all PV sizes and allcontrol option described in the followingmanual.

Figure 2 shows this module from the outside,figure 3 the electronic control circuit.

Figure 2: electronic module PQDXXA-Z00

Figure 3: circuit diagram for electronic module PQDXXA-Z00

The modules are designed for snap trackmounting according to EN 50022.

They require a power supply of 22 - 36 VDC.The module is connected to the LVDT(displacement feedback) and to the propor-tional solenoid of the displacement controlvalve according to the diagrams in chapter 9.

A detailed functional description of themodule and a installation instruction is givenin bulletin

HY11-PVI020/GBThe electronic module provides a ramp

function for soft approach to different workingconditions.

Beside that the working range of the pumpcan be individually adjusted. It also providesdiagnosis signals to monitor pump and modulefunctions.

The proportional displacement control code...FPV does not include a pressure control /compensation. The hydraulic circuit has to beprotected with a pressure relief valve, to avoiddamage to the system by too high pressures.




Figure 4 shows the hydraulic circuit of thiscompensator variation. In this example a pro-portional pressure control valve is used to pilotthe remote pressure stage (included in code...UPD). That allows a continuous adjustmentof the pressure compensator setting by anelectrical input command.

Figure 4: hydraulic circuit of the ...UPR, ...UPD, ...UPZ control

proportional pressurepilot valve, code:PVACPPU**35(not included with codes...UPR and ...UPZ)

pressure compensatorstage, PVCF*U2**

displacement controlstage, code:PVCF*PV**

2. Proportional displacement controlwith pressure compensation, codes...UPR, ...UPD, ...UPZ

The compensator codes ...UPR, ...UPDresp. ...UPZ include a pressure compensation,which can override the proportionaldisplacement control. This is achieved bycombining a second control valve (remotepressure compen-sator) with the displacementcontrol valve.

SQ = signal, displacementIQ = solenoid current, displacement

control valveIP = solenoid current, pressure pilot

valve

UQ = command, displacementUP = command, pressure

6



The position of the control spool of thepressure compensator is controlled by thepressure drop across the pilot orifice DP andby the compensator spring. The nominalcontrol pressure difference is factory-set to avalue of 15 ± 1 bar.

As long as the pressure setting of the pilotvalve (in figure 4: proportional pressure valvePVACPPU..) is not yet reached, the controlvalve spring keeps the control spool in theposition shown. The control port of thedisplacement control valve is connected to thelarge servo piston area and controls theposition of the servo piston.

The displacement control operates asdescribed in chapter 1. The adjustment of thecontrol pressure is done between the controlspool and control orifice DB1.

When the set pressure of the pilot valve isreached, this valve opens and control flow fromthe pump outlet is passing the pilot orifice DPand the pressure pilot valve before returningto the pump drain line. That creates a pressuredrop across pilot orifice DP. If this pressuredrop reaches the 15 bar setting of thecompensator, the control spool of the pressurestage is in its control position.

That leads to a reduction of the pumpdisplacement in order to keep the pump outletpressure constant. As the displacement controlwants to keep the pump at the setdisplacement the proportional solenoid ispowered with nominal current. That connectsthe control port of the displacement controlvalve with the pump case (port L).

The control spool of the pressure stage nowcontrols the servo piston position by using thecontrol orifice DB2 for pressure dividing.Pressure control is achieved as with astandard remote compensator. It ismandatory, that the displacement setting ofthe displacement control stage is high enough,to cover the flow requirements of the system,the pump and the control valves to maintainthe desired pressure.

The following valve is to be used with thismodule:´PVACPPU..35. Other valve modelscan lead to instability problems or malfunctionof the control.

This valve is designed for a nominalpressure of 350 bar. By using the MAXadjustment at the control module, the inputcommend range can easily be adjusted to anysmaller nominal system pressure. In this wayalso for these lower pressures full resolutionof the input commend can be achieved.

For basic adjustment of the control valvesand the LVDT see chapter 8. For electricalconnections and cable requirements seechapter 9.

Note: Parker has decided for this designwith a separate hydraulic-mechanicallyoperated remote pressure compensator,which overrides the proportional displacementcontrol for three reasons:1. Piston pumps of the PV series have a largeservo piston. That offers several advantages.On the other hand the servo piston has a highflow demand for compensation. A hydraulic-mechanical pressure compensator - as usedhere - can provide much higher control flows,than a proportional directional control valveused by other pump models, where this valvealso provides pressure control basing of thesignal of a pressure transducer.2. The hydraulic-mechanical control valve„senses“ a pressure peak in the system, asthe pressure acts direct on the control spool.Depending on the actual system pressure veryhigh forces are available to operate the spool.Therefore this control rarely will tend to stickor malfunction, as proportional directionalcontrol valves may do under contaminated fluidconditions.3. The pressure control using a proportionalpressure control valve to pilot it, does notrequire a pressure sensor at the pump outlet.That saves this sensitive and expensivecomponent. Nevertheless a closed looppressure control can be offered if required (seenext chapter).




3. Proportional displacement controlwith closed loop pressure control,code ...UPG

With compensator ordering code ...UPG apressure sensor and a proportional pressurevalve is combined with the remote pressurecontrol stage. That realizes a closed looppressure control. It also offers the option ofan electronic horse power limtation.

The hydraulic circuit for this control option isshown in figure 5.

The pressure sensor included in theshipment is of the model SCP 8181 CEsupplied by the Parker Connectors Group. Thesensor can be ordered separately under codePVACUS* (* for seal material option).

Also included in the shipment is a proportio-nal pressure pilot valve of the ordering codePVACPPU..35.

The hydraulic function is described in therecent chapter. There are no differences.

pressure sensor

Figure 5: hydraulic circuit of the ...UPG control

proportional pressurepilot valve, code:PVACPPU**35

pressure compensatorstage, PVCF*U2**

displacement controlstage, code:PVCF*PV**

SQ = signal, displacementIQ = solenoid current, displacement

control valveSP = signal, pressure sensor

IP = solenoid current, pressure pilotvalve

UQ = command, displacementUP = command, pressure

8



As shown in figure 5, the pressure sensor ispositioned in the pilot circuit. According to thedifferential pressure adjusted at thecompensator valve, the system pressure ishigher than the controlled pressure.

This concept avoids stability problems withthe control loop and the necessity of anexternal adjustment of the control loop. On theother hand there are additional measuresnecessary (e. g.: command signal correction),if linearity between input (command signal) andoutput (system pressure) is required.

Figure 6 shows the typical behaviour of pilotpressure pR and system pressure p1 asfunction of the input signal.

The digital control module offers the requiredsignal correction to compensate for this effect.The standard module parameter sets alreadyinclude this feature for the factory set pressuredifferentialof 15 bar.

For other differential settings see moduleoperating instructions.

Figure 6: pressures vs input signalcommand UP

syst

em p

ress

. p1,

pilo

t pre

ss. p

P

p1 = pressure at pump outlet, systempressure (=pP + ∆p)

∆p = compensator differential (factorysetting 15 bar)

pP = pressure at pilot valve, closed loopcontrolled pressure




4. Preload valve for proportionalcontrolled pumps, code PVAPVV...

As already mentioned in chapter 1, a pro-portional controlled variable displacementpump needs always a minimum outletpressure of approx.15 bar, to downstroke thepump against the servo spring force.

In some applications and especially at smalldisplacement settings that is not always given.

Two possibilities to solve this issue aredescribed in the following chapters:

If and external auxiliary pressure is available,this can be used to control the pump at lowoutlet pressure. This method, using a shuttlevalve, is explained in chapter 5.

The other option is the use of a preload valve(sequence valve).

Figure 7 shows the hydraulic circuit of apump with ...FPR control, using a preloadvalve. The preload valve is offered as amanifold, that can directly be flanged to thepressure port of the pump. The ordering codeis PVAPVV*. The * stands for the frame sizeof the pump, the screw option and the sealmaterial.

The preload valve is also available as slip incartridge valve according to DIN 24 342.

Because of the pilot valve characteristic theopening pressure p1 is approx. 20 bar. Theport Mp1 can be used to get under all workingconditions a pressure of 20 bar e. g. to pilotvalves with external pilot pressure supply. Atapprox. 25 bar system pressure the valve isfully open (pressure drop < 1bar).

Figure 7: hydraulic circuit of a pump with ...UPR control and preload valve

preload valve,code: PVAPVV*

10



Figure 8 shows the preload manifold fordirect mounting to the pressure port of thepump. It takes screws with the length L tomount it to the pump. L includes the lengthscrewed into the pump end cover.

Input and output are designed as flangeports according to ISO 6162 and fit direct tothe according PV frame size. Table 1 showsthe main dimensions.

Figure 8: outside view of thepreload manifold for directpump mounting. Outletoptional to front (shaft side)or to the rear

dimension BG1 BG2 BG3 BG4 BG5H[mm] 100 100 110 110 120B[mm] 90 90 100 100 125T[mm] 80 80 92 92 105L[mm] 102 102 122 (119*) 122 (119*) 136T1[mm] 116 116 137 137 155for size PV016 - 023 PV032 - 046 PV063 - 092 PV140 - 180 PV270DN[mm] 19 (3/4“) 25 (1“) 32 (1 1/4“) 32 (1 1/4“) 38 (1 1/2“)PN[bar] 400 400 400 400 400M M10 M12 M12 (M14*) M12 (M14*) M16valve insert DIN E16 DIN E16 DIN E25 DIN E25 DIN E32Qnominal[l/min] 160 160 300 300 550*: optional for PV063 - PV180, thread option 4

Table 1: main dimensions of preload manifold

drain port L, G1/4“

gage port p2, G1/4“(system pressure,covered)

flanged ports ISO 6162: DN, PN;fits to PV frame size BG;threads: M

Note: All auxiliary manifoldscan also be supplied in US-version ( UNC threads andUNF ports) and with portsaccording to ISO 6149.

gage port p1, G1/4“(preloadedpressure, covered)




5. External pilot pressure supplyThe alternative solution is, to supply the

control circuit from an external auxiliary pilotpressure supply circuit. The servo system isdisconnected from the pump outlet (plug insideof the pump gage port). The pump outletpressure is connected via a check valve tothe pilot pressure port.

An external source for auxiliary power(capable of a flow of 20 - 40 l/min (dependingon pump size) at a pressure of 20 - 30 bar) isalso connected via a check valve to the pilotport.

Figure 9 shows the hydraulic circuit for thisoption.

Figure 9: hydraulic circuit of a pump with external pilot pressure supply

check valves

As long as the pump outlet pressure is lower,than the external supply pressure, the controlcircuit is powered by the external source.

When the system pressure exceeds theauxiliary pressure, the control is internallypressurized.Please note:- for pressures below the auxiliary pressure

a pressure control is not possible, becausethe controlsenses the supply pressure.

- using this option the pump can be operatedat 0 bar and dead head. Under theseconditions the pump does not provide drainflow and the pump can overheat. Caseflushing is necessary.

12



5. Quick pressure relief with quickunload valve, code PVAPSE* incombination with controls codes...UPS resp. ...UPT

When working with proportional pressurecontrolled pumps, the system pressure doesnot follow immediately the input signal whenswitching to a lower pressure setting.

Reason for this is, that a pump can supplyflow but cannot take flow to relieve a system.To decrease the pressure in a system,compression volume has to be taken away inorder to reduce the pressure. A pump only canbe downstroked to deadhead and pressurecan only decrease due to leakage and pilotpower requirements. That can take up toseveral seconds.

A quick unload valve valve, code PVAPSE*,flanged direct to the pump outlet solves thisproblem.

The * in the ordering code stands for pumpframe size, seal material and screw option.Figure 10 shows the hydraulic circuit of a pumpwith p-Q-control equipped with this quickunload valve.

A slip-in cartridge valve is inserted into thepilot connection to the pressure compensatorstage. The pilot flow to the proportionalpressure pilot valve has to pass two orifices inthe poppet and in the cover of this valve. Thepoppet is kept closed with a 4-bar-spring.

The pressure compensator stage has in thiscase not the control spool with the internal pilotorifice, because pilot flow is now suppliedexternally through the quick unload poppet.

Figure 10: hydraulic circuit of an ...UPS control with quick unload valve manifold

quick unload valve,code: PVAPSE*




The ordering code for this pressure com-pensator stage is PVCF*US**. See also spa-re parts list PVI-PVC for details.

In the pump ordering code this option iscoded with ...ÚPS, code ...UPT indicates theequivalent version for closed loop pressurecontrol / electronic horse power control.

Under normal working conditions the controldifferential pressure of - in this case - 15 baris created across the two orifices in quickunload valve poppet and cover. According tothe orifice dimensions thedifferential pressure is splitin a 1 : 3 ratio (3 bar dropat the poppet, 9 bar dropat the orifice in the cover.

At a pressure overshootor when switching to a lowcom-manded pressure thetotal differential pressure issignificantly increased.That results in a pressuredrop across the poppet ofmore than 4 bar (springpreload) and the poppetopens to the return line.

That leads to a quick reduction of systempressure.

When the control differential pressure getsdown to 16 bar the poppet closes again. Usingthis pump accessory the system pressurefollows the command signal in both directionswithout delay.

Figure 11 shows the quick unload valve in amanifold fitting direct to the pump outlet, table2 lists its main dimensions.

dimension BG1 BG2 BG3 BG4 BG5B[mm] 100 100 110 110 130H[mm] 80 80 100 100 120T[mm] 80 80 80 80 100B1[mm] 136 136 146 146 175for size PV016 - 023 PV032 - 046 PV063 - 092 PV140 - 180 PV270DN[mm] 19 (3/4“) 25 (1“) 32 (1 1/4“) 32 (1 1/4“) 38 (1 1/2“)PN[bar] 400 400 400 400 400M M10 M12 M12 (M14*) M12 (M14*) M16valve insert DIN E16 DIN E16 DIN E16 DIN E16 DIN E25Qnominal[l/min] 160 160 160 160 300G (port T) 1/2“ 1/2“ 1/2“ 1/2“ 3/4“*: optional for PV063 - PV180, thread option 4

Table 2: main dimensions of the quick unload manifold

Figure 11: quick unload manifold return port T, thread G;

control port pP,G1/4“ (tocompensator)

flange port ISO 6162, DN, PN;fits to PV frame size BG;thread M

Also availablein US-version(UNC threadsand UNF ports)and with portsaccording toISO 6149.

gage port MpP,

max. pressurepilot valve

14



6. preload and quick unload manifoldPVAPVE* in combination withcompensator codes ...UPP resp....UPE

The pump accessory manifold codePVAPVE* combines preload and quick unloadfunction.

This manifold is flanged direct to thepressure port of a PV pump. For functionaldescription see the last chapters.

To ensure a correct function under allworking conditions and to control immediatelythe load pressure, the control pressure has tobe taken after the preload valve.

Figure 13: hydraulic circuit of the ...UPS control with preload and quick unload manifold

Sensing area of the control spool and springchamber are both to be connected by pipe orhose to the control ports of this manifold. Thehydraulic circuit diagram figure 12 displays this.

Both functions are built into one manifold.Figure 13 shows this manifold and table 3 liststhe main dimensions.

The dimension L indicates the total lengthof the mounting bolts and includes the lengthscrewed into the pump end cover.

The hydraulic connections between manifoldand pump compensator (ps and pp) are notincluded in the pump shipment.

pre-load and quick unload manifold,code: PVAPVE*




dimension BG1 BG2 BG3 BG4 BG5B[mm] 125 150 157 157 190H[mm] 105 130 130 130 154T[mm] 80 80 92 92 105L[mm] 105 103 121 121 137,5B1[mm] 189 189 196 196 239H1[mm] 166 166 166 166 199T1[mm] 116 116 137 137 155for size PV016 - 023 PV032 - 046 PV063 - 092 PV1240 - 180 PV270DN[mm] 19 (3/4“) 25 (1“) 32 (1 1/4“) 32 (1 1/4“) 38 (1 1/2“)PN[bar] 400 400 400 400 400M M10 M12 M12 (M14*) M12 (M14*) M16valve insert NG1 DIN E16 DIN E16 DIN E25 DIN E25 DIN E32Qnominal[l/min] 160 160 300 300 550valve insert NG2 DIN E16 DIN E16 DIN E16 DIN E16 DIN E25Qnominal[l/min] 160 160 160 160 300G (port TE) 1/2“ 1/2“ 3/4“ 3/4“ 3/4“*: optional for PV063 - PV180, thread option 4

Figure 13: preload and quick unload manifold

Table 3: main dimensions of the preload and quick unload manifold

gage port MpP,pilot pressure,G1/4“

outlet

return port TE,thread G

flange ports ISO6162; DN,PN; fit to PV, frame size BG;thread M preload valve,

insert DIN E NG1cover and insertDIN E NG2quick unloadvalve

port p1,G1/4“,preloadedpressure(covered)

max. pressurepilot valve

Also available inUS-version ( UNCthreads and UNFports) and withports according toISO 6149. port pP, pilot

pressure, G1/4“port pS, systempressure, G1/4“

gage port MpS,systempressure, G1/4“

alternativeoutlet port P2,thread G2

16



protection plugwith o-seal

zero adjustment(sealed)

do not touch!

electricalconnection

8. Basic adjustment of displacementfeedback and compensator valves

The inductive position transducer fordisplacement feedback (LVDT) and thecompensator valves are factory preset andthe settings are secured. New or re-adjustemnt is only necessary after repair.

LVDT for displacement feedback:Prior to a basic setting the adjustment of

the armature lentgh is to be checked / re-adjusted (see figure 14). The exact dimensionfor this setting is given in table 4:

The adjustment is secured by a removableglue. A new setting again has to be secured toavoid uncontrolled re-setting.

At full upstroked pump the mechanicaladjustment can be verified: The voltage at theLVDT output (pin 25 at the control module)should have a value as given in the table below(± 0,2 V).

Figure 14: setting dimension A for LVDTarmature

MAX-adjustment:Next the command for the displacement is

to be increased, until the maximum displace-ment of the pump is reached. That can eitherbe monitored by using the diagnosis output ora flow meter at the pump outlet. The maximumdisplacement is reached, if the displacement/ flow does not further increase, even whenthe input command is still raised.

Figure 15: inductive positon transducer(LVDT), outside view

Zero adjustment: Next the zero adjustment of the LVDT is to

be checked. The LVDT and the solenoid ofthe displacement control valve are to beconnected according to chapter 9 to theelectronic control module.

At running pump the command for thedisplacement is to be set to 0 and the pressurerelief valve of the circuit / test rig has to be setto a pressure > 25 bar. All other connections /valves in the hydraulic circuit are to be closed.

The pump then will downstroke to deadheadat the minimum pump compensating pressure(10 ± 2 bar). By setting the zero adjustmentpotentiometer (see figure 15) at the LVDT thediagnosis output of the control module is tobe set to 0 V, as the actual displacement isthe minimum displacement that can becontrolled. After adjustment the potentiometermust be sealed again.

size voltage size voltage

PV016 6,34 V PV063 6,98 VPV020 6,03 V PV080 6,38 VPV023 5,80 V PV092 5,95 VPV032 6,01 V PV140 5,07 VPV040 5,63 V PV180 3,95 VPV046 5,45 V PV270 3,95 V

Bau- Seriegröße 45

16-23 73,5

32-46 73,5

63-92 75,0

140-180 75,0

270 75,0

Table 4: setting dimensions LVDT core




In a control situation the solenoid shoulddraw approx. 60 % of its nominal current (no-minal current 1,3 A; current in control situation750 mA). Under these conditions the soleno-id provides approx. 50 % of its nominal force.That leads to a similar response for on- andoffstroking. By turning the adjustment screw,this can be achieved. Clockwise turningincreases the solenoid current (force).

The remote pressure compensation stageof the p-Q-controls codes ...UPR, ...UPD,...UPZ, ...UPG, ...UPS, ...UPT, ...UPP and...UPE(see chapters 2 to 7) is adjusted asfollows:

protection cap

electrical connection

set screw (basic adjustment of control valve)

After the adjustment the lock nut securesthis setting and the cap nut covers the setscrew.

See also setting instructions in manualHY11-PVI020 for the digital control modulePQDXXA-Z00.

Caution: the proportional displacementcontrol, code ...FPV does not include apressure compensation. Therefore thehydraulic circuit needs to be protected witha pressure relief valve (safety valve). Thisvalve has to be layed out for full pump flow.

Figure 16: displacement control valve

Figure 17: proportional displacement controlvalve with open set screw

The factory setting for the differentialpressure is 15 ± 1 bar. For re-adjustment twopreeure gages / transducers are required. Thedifferential pressure to be adjusted is thedifference between the two pressures on bothsides of the control spool of the pressurecompensator stage in a control situation. Forcompensator codes ...UPP and ...UPE this isthe difference between the pressure pF on thesensing side and the pilot pressure pR (seefigure 13).

For all other codes it is the differencebetween pump outlet pressure p1 and pilotpressure pR.

The leads to a minimum compensationpressure of 15 bar at completely unloadedspring chamber.

Figure 18: proportional p-Q-control

differential pressure adjustment

If the command reaches 10 V (max. inputcommand) prior to that point (resp. at currentinput 20 mA), the displacement (the flow) canstill be increased by using the MAXpotentiometer on the module.

Is the maximum displacement is reachedlong before the command reaches 10 V, thiscan also be corrected by reducing the settingof the MAX potentiometer.

Basic adjustment control valve:To adjust the displacement control valve, the

cap nut, the lock nut, the washers and the o-rings are to be removed (figure 16). Then a50 % command should be adjusted.

lock nut

lock nut

18



Connecting diagram for proportional displacement control; code ..FPV(cable description see page 20)

cabl

e 1

from

LV

DT

cabl

e 2

to p

ropo

rtio

nal s

olen

oid




Connecting diagram for p-Q-control; codes ..UPR, ...UPZ, ...UPG, ...UPS, ...UPT,...UPP and ...UPE (cable descriptions see pages 20 and 21)

cabl

e 3

to p

ress

ure

valv

e so

leno

id

cabl

e 4

from

pre

ssur

e se

nsor

cabl

e 1

from

LV

DT

cabl

e 2

to d

ispl

acem

ent

cont

rol s

tage

sol

enoi

d

20



Cable 1 from LVDT (displacement transducer)

cable: 4 x 0,5 mm², shielded, max. 50 m longconnector: round type M12 x 1; 5-pin

angled versionitem number: 5004109

Alternative: shielded cable with molded connector; in different length and variations available e. g.through companies Amphenol, Heilbronn and Vogel, Renchingen.This solution is recommended for dynamic stressed systems (vibrations) due to the lower connectorweigth.

Cable 2 to displacement control valve (displacement control)

cable: 3 x 1,5 mm², max. 50 m longconnector: according DIN 43 650, version AF, 3-pin

protection class IP 65 for voltages up to 250Vitem number: 5001710 (PG 9)item number: 5001716 (PG11)




cable: 3 x 1,5 mm², max. 50 m longconnector: according DIN 43 650, version AF, 3-pin

protection class IP 65 for voltages up to 250Vitem number: 5001710 (PG 9)item number: 5001716 (PG11)

Cable 3 to proportional pressure pilot valve solenoid (not for module PQ0*-F00 resp.compensator code ...FPV)

Cable 4 from pressure sensor(only for modules PQ0*-Q00 and PQ0*-L00 resp.compensator codes ...FPG, ...FPT and ...FPE)

cable: 3 x 0,5 mm², shielded, max. 50 m longconnector: according DIN 43 650, version AF, 4-pin

protection class IP 65 for voltages up to 250Vitem number: 5001720 (PG11)

22



Trouble shooting guidePump delivers no output flowDrive motor does not turnreason Motor is not connected correctly or one of the three phases has failed. Motor does not

turn smoothly when pump is disconnected from pump.solution Check motor connections, check electrical power supplyreason Pump is mechanically blocked. Motor turns smoothly when disconnected from pumpsolution Send pump for service to factory.Drive motor only turns at slow speedreason Motor is not selected properly. In star circuit not enough torque.solution Start pump at unloaded system. Use motor with more horse power.reason Pump is hydraulically blocked. No function of compensator, no pressure relief valve;

Pump stops after e few turns.solution Check function of pump compensator (see below). Start pump at unloaded system.Drive motor turns, pump does not turnreason Coupling is not or not correctly mounted.solution Check coupling assembly and correct it.Drive motor turns and pump turnsreason Wrong direction of rotationsolution Change direction of motor rotationreason Fluid reservoir empty or not filled to level, suction line ends above fluid level.solution Fille reservoir to required level, if necessary increase suction pipe length.reason Suction line is blocked. E. g. by plugs, cleaning tissues, plastic-plugs. Ball valve in the

suction line closed. Suction filter blocked.solution Check suction line for free flow. Open valves in suction line. Valves should be equipped

with electrical indicator. Check suction filter.reason Suction line not gas tight, pump gets air into suction port .solution Seal suction line against air ingression.reason Pressure line / system is not able to bleed air out.solution Unload pressure port, unload system before start, bleed air from pressure line.Pump does not build up pressure, but delivers full flow at low pressurereason Standard pressure compensator is set to minimum pressure.solution Adjust compensator setting to desired pressure.reason Orifice in remote pressure compensator blocked.solution Make sure orifice Ø 0,8 mm in control spool is free and open.reason No pressure pilot valve connected to port PR.solution Install suitable pressure pilot valve and adjust it to the desired setting.reason Multiple pressure pilot selector valve is not energized; Pump works in stand-by.solution Energize selector valve solenoid.reason No load sensing line connected.solution Connect system load sensing port to compensator.reason Load sensing valve is closed or too small.solution Open load sensing valve, use larger valve size.reason Too much pressure drop between pump and load sensing valve.solution Make sure connection is wide enough and has not too much pressure drop.reason Differential pressure at compensator is adjusted properly (too low).solution Check differential pressure adjustment and correct it as described above.




Pump does not build up pressure, but delivers full flow at low pressurereason Horse power compensator setting changed.solution Check setting of horse power compensator and correct it, if required.reason Proportional displacement control is not connected as required.solution Check wiring; connect according to installation manual for electronic module.reason Displacement transducer (LVDT) adjustement changed.solution Correct zero setting at displacement transducer.reason Electronic module has no supply power.solution Make sure module is powered with 22 - 36 V DC.reason Plug instead of orifice Ø 0,8 mm in the load sensing line to pump.solution Install orifice as required.reason Cylinder block lifts from valve plate due to excessive wear.solution Send pump to factory for service.Pump does not compensatereason No orifice is in load sensing line to compensator code FFC.solution Install orifice Ø 0,8 mm as shown in circuit diagram (page 9).reason No pressure pilot valve connected to compensator or valve is blocked.solution Connect pressure pilot valve to compensator, make sure valve opens as required.reason Load sensing line connected incorrect (e. g. upstream of load sensing valve)solution Connect load sensing line downstream (actuator side) of load sensing valve.reason No or too low pressure at pump outlet port.solution Pump outlet pressure must be at least 15 bar, because otherwise the bias spring in

the pump cannot be compressed.Pump does not upstroke, sticks at zero displacement.reason Compensator is blocked due to contamination.solution Clean hydraulic fluid, clean compensator valve.reason Cable to LVDT or proportional solenoid is interruptedsolution Check wiring and make sure cable is ok. Replace if necessary.Compensator is unstablereason Compenstor spool is sticking due to contamination of hydraulic fluid.solution Clean hydraulic system, clean compensator valve.reason Compensator differential pressure changed (too low or too high)solution Adjust compensator differential pressure to required setting.reason Wrong pilot orifice or pressure pilot valve improperly selected.solution Select pilot orifice and pressure pilot valve as recommended.reason Dynamic critical system, e. g.: pressure compensator combined with pressure reducing

valve, load sensing (flow) compensator combined with flow control valve.solution use remote pressure compensator instead of standard pressure compensator, install

orifice in load sensing line remote from compensator (as close as possible to loadsensing valve).

For additional information, spare parts or service requirements please contact:Parker Hannifin GmbH Tel.: 02131 / 513-0Hydraulic Controls Division Fax: 02131 / 513-285Business Unit Pumps and Motors Internet: www.parker.comGutenbergstr. 38 e-mail: [email protected] 41564 Kaarst

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