Proportional Directional Control Valves PRM7-6/ Size D () bar (6 PSI) L/min (. GPM ) Replaces /9 Digital control Compact design Operated by proportional solenoids High sensitivity and slight hysteresis Installation dimensions to DIN / ISO / CETOP RP-H Functional Description The proportional directional valve PRM7 consists of a cast iron housing, a special control spool, two centering springs with supporting washers, one or two proportional solenoids, a position sensor or, if need be, of a control box with digital electronics. The measuring system of the position sensor consists of a differential transformer with core and from the evaluating electronic unit realized in hybrid technique. With the model without integrated electronic unit, the electric connection of the solenoids is realized by the connector plug to EN 7-8, with the position sensor output being connected by the GWF connector plug. Both connectors are supplied. The proportional valve with the integrated electronic unit comprises an electronic control box that is mounted, together with the position sensor, on either of the solenoids. The connection of the position sensor with the control box is provided by a cable. With the model with two solenoids, the solenoid mounted opposite the control box is connected with the control box by means of a EN 7-8, connector. The connection of the supply voltage, control signal, program input and external output of the position sensor is realized by a -pin connector (ELKA ). The connection of the external feedback is provided by a -pin connector, which also has three supply voltages + V, +V and -V for an external sensor available. The solenoid coils, including the control box, can be turned in a range of ±9 o.the digital control unit enables the proportional valve to be controlled on the basis of data required from two feedback circuits. In this case the proportional valve can be used as follows:. Proportional directional valve. Only with the internal feedback from the spool position sensor.. Only with the external feedback (pressure sensor, position sensor, etc.).. With internal and external feedback. The outlet current to the electromagnet coils is controlled with the help of PWM. The electronic system is equipped with an internal current feedback. The outlet current in case of need may be modulated with the use of a signal of dynamic lubrication. Single function parameters are set up with the use of appropriate software with the help of a computer connected to the proportional switchboard through a serial interface RS. It is necessary to order a cable in accordance with appropriate ordering number as mentioned on page. The digital control unit utilizes the pulse-with-modulation (PWM) and supplies the solenoids with current proportional to the control signal. The supply current is additionally modulated with a dither frequency. The individual functional parameters are adjusted through software by means of a special programmer, or by means of a computer through the RS interface. The correct function of the digital control unit is signaled by a green LED. The incorrect function (failure) is indicated by a red LED. As a standard, the proportional valve is delivered with factory setting. The model including also an external feedback shall be consulted with the manufacturer. With the basic surface treatment, the valve housing is phosphate coated, whereas the surfaces of the solenoids are zinc coated.
Ordering Code PRM7- / - Proportional Directional Control Valve without designation V Seals NBR FPM (Viton) Nominal size (D ) S Model position sensor with voltage outlet S position sensor with current outlet Spool Symbols Z E ES E proportional directional valve without feedback proportional directional valve with position feedback proportional directional valve with external feedback Z ES proportional directional valve with position and external feedback Y Y Nominal solenoid supply voltage Z **supply voltage V DC supply voltage V DC q q A B = * Z Y ** Cannot be supplied as Variant S Nominal flow rate at p = PSI ( bar) q q A B = * Y flow L/min (. GPM) flow 8 L/min (. GPM) flow L/min (. GPM) 8 * Model for cylinders with asymmetric piston rod, piston area ratio : Connectors are to be ordered separately, see ordering number on page
Technical Data Nominal size mm (US) (D ) Max. operating pressure at ports P, A, B bar (PSI) (6) Max. operating pressure at port T bar (PSI) (6) Hydraulic fluid Hydraulic oils of power classes (HL, HLP) to DIN Fluid temperature range (NBR / Viton) C ( F) -... +8 (-... +76) / -... +8 (-... +76) Ambient temperature max. C ( F) + (+) Viscosity range mm /s (SUS)... (98... 8 ) Maximum degree of fluid contamination Class /8/ to ISO 6 Nominal flow at p = bar ( PSI) L/min (GPM) (.) /8 (.)/ (.) Hysteresis - open loop % < 6 Hysteresis - closed position loop % <. Weight - PRM7- - PRM7- Mounting position Enclosure type to EN 69 kg (lbs) Technical Data of Position Sensor - Voltage Outlet. (.).8 (.96) unrestricted IP6 Operating pressure bar (PSI) max. (6), static Electric connection electrical connector GWF Hirschmann * - Power supply Contact assignment - Command signal - GND - not used Enclosure type to EN 69 IP6 Measured distance mm (in) 8 (.) Operating voltage V 9.6... DC Linearity error % < Current consumption at load current of ma ma < Output voltage V... Output signal range used: Position solenoid - stroke.8 mm (.7 in) solenoids - stroke.8 mm (.7 in) V..7 -..7 -.6 Max. load current ma Noise voltage - at load current - at load current of ma Additional output signal error at: Temperature change between... 8 C (...76 F) mv p-p < < Between... - C (...- F) Load change from to ma.% Input voltage change from 9.6 V to. V from. V to V typical <.% / K max..% / K max..% / K % <. <. Long-term drift ( days) % <. Cut-off frequency db fall in amplitude Frequency 9 Hz > 6 > 6 * Only for S and S model.
Technical Data of Position Sensor - Current Outlet Linearity % Operating pressure bar (PSI) to (6), static Electrical connection electrical connector GWF Hirschmann * Contact assigment Enclosure type to EN 69 - Power supply - Command signal - GND - not used Operatin voltage V... DC Current ma Output signal range ma... Output signal range used: position solenoid -stroke.8 mm (.7 in) solenoids - stroke.8 mm (.7 in) Additional output signal error: - at temperature change from +... C (... F) - at imjpedance change from % - at input voltage change in the range of operating voltage ma IP6 8.... 8......6.% / K.%.% Impedance Output signal ripple ma R.M.S.. Limit frequency at db amplitude decrease Hz 8 * Only for S and S model. Technical Data of Proportional Solenoid Type of coil V DC DC Limiting current A.7.8 Resistance at C (68 F).9 Electronics Data Supply voltage with polarity inversion protection V.... 8 VDC (residual ripple %) Input: command signal / according to customer setting Input: spool position sensor signal Input: external feedback signal Resolution of the A/D converter Output: solenoids ±V,... V, ±ma,...ma,...ma,ma 8mA...V...V,...mA,...mA, bit Two PWM output stages up to max.. A PWM frequency khz 8 Adjustment of parameters s 7 EMC Interference resistance 6-6 - : Radiation resistance : 998 class A Parameter setting Serial port RS (zero modem). 9 bauds, 8 data bits, stop bit, no parity. Special software PRM7Conf. Accessories Order number Content 9 Connecting cable to PC - length m (6.6ft), CD-ROM with program PRM7Conf and user manual. 9 Connecting cable to PC - length m (6.ft), CD-ROM with program PRM7Conf and user manual. Connecting cable to PC - length size m (6.6ft). Connecting cable to PC - length size m (6.ft).
Limit Power Only for E model Measured at = mm /s (6 SUS) P A / B T or P B / A T Nominal flow L/min (. GPM) Nominal flow 8 L/min (. GPM) Flow Q [L/min (GPM)] (.) (.9) (.6) (.) 6 6 (.) (.9) (.6) (.) (7) (7) (66) (76) Input pressure p o [bar (PSI)] (7) (7) (66) (76) Input pressure p o [bar (PSI)I] Nominal flow L/min (. GPM) Flow Q [L/min (GPM)] (.) (.9) (.6) (.) 6 Solenoid current: = % = 6% = 7% = 8% = 9% 6 = % (7) (7) (66) (76) Input pressure p o [bar (PSI)] Flow Characteristics Measured at input pressure p = bar ( PSI), = mm /s (6 SUS) Only for E model 8 6 Flow Q [%] - - -6-8 - - -8-6 - - 6 8 Command value [%]
Flow Characteristics Measured at = mm /s (6 SUS) Only for ES model = L/min (. GPM) by p = bar ( PSI) (.8) (.) 8 6 (.) P A / B T or P B / A T p =Valve pressure differential (inlet pressure p V minus load pressure and return pressure p T ) p n Valve pressure differential for nominal flow Flow Q [L/min (GPM)] (.) (.) (-.) (-.) (-.) (-.) (-.8) 8 - -8 - -6-8 - p n = bar ( PSI) p = bar ( 7 PSI) p = 6 bar ( PSI) p = bar (6 PSI) -8-6 - - 6 8 Command value [%] Only for ES model = 8 L/min (.GPM) by p = bar ( PSI) Flow Q [L/min (GPM)] (7.9) (.) (.) (.6) (.) () (-.) (-.6) (-.) (-.) -(7.9) - - - - - - - P A / B T or P B / A T -8-6 - - 6 8 Command value [%] p n = bar ( PSI) p = bar ( 7 PSI) p = 6 bar ( PSI) p = bar (6 PSI) Only for ES model = L/min (. GPM)by p = bar ( PSI) Flow Q [L/min (GPM)] (7.9) (.) (.) (.6) (.) () (-.) (-.6) (-.) (-.) -(7.9) P A / B T or P B / A T - - - p n = p = bar ( PSI) bar ( 7 PSI) - p = 6 bar ( PSI) - p = bar (6 PSI) - - -8-6 - - 6 8 Command value [%] 6
Frequency Reponse closed position loop, for ES model Amplitude ratio [db] - - - - - -6-7 -8-9 - - - - - - -6-7 ------- signal % signal 9% Frequency [Hz] 8 7 6 9 8 7 6 Phase lag [degrees] Connector Connection K K K 7 6 Connector K- type M (male) PIN Technical data Description * Power supply input.... 8V DC * Ground (power supply) V Control signal according to configuration Ground (signal) V Power reference signal +V DC/max.mA 6 Control signal of position sensor spool...v 7 * Protection earth lead (PE) --- * Recommended min. lead cross section.7mm Connector K - type Mx (male) PIN Technical data Description TxD standard RxD RS Ground (signal) V Not used Connector K - type Mx (female) PIN Technical data Description Power supply output.... 8V DC/max.mA Signal of external feedback according to configuration Ground V Not used Not used K - Connection RS Mx ( PIN) For programing the electronics. K - Main inplut connector M (7PIN) Cable diameter 8...mm (...7in). a b K - Conektor Mx (PIN) External feedback signal (it presented only for E and ESconfigurations). 7
.(.6) Factory Settings Item Model E ES E ES Control signal... V ± V... V ± V... V ± V...V ± V Signal external feedback - - - -... V Output position sensor spool - -... V -... V Valve Dimensions Dimensions in millimeters (inches) 8.(.7).7(.) 6.7(.7)... S... S.(.9) (.9) (.) 6 7 8 9(.). (.) HEX 6HR HEX 8(.9) 9(.7) 7(.6).7(.9).(.).(.8).(.89).(.7).(.7) 9.7(.78) 7(.8).(.9) 6.(.) 7(.8) Solenoid a 89(.).6(.99) 6(.) Solenoid b Manual overid (66.6(.)) Name plate mounting holes 6 Solenoid fixing nut 7 Position sensor 8 Solenoid supply connector 9 Square ring 7.6 x.68 ( pcs.), supplied in delivery packet Position sensor connector Plug screw for valve with one solenoid, HEX, configurations Z, Z 9.(.).8(.) 66(.6) Required surface finish of interface 8
Valve Dimensions Dimensions in millimeters (inches)... E - without connector plug for spool position feedback... E 7 max.7(.79) max.7(.76) 8 (.8) 9(.) a 9(.) HEX 6HR.(.) b 7(.6) (.7) 8(.9) 7(.6) Solenoid a Solenoid b Manual override Name plate mounting holes 6 Solenoid fixing nut (.79) 67(.6).(.).8(.) 6 9... ES - without connector plug for spool position feedback... ES 8 7 6 68(.68) (.97) 6(.) (.97) 96(.78) (9)(7.6)). (.6) 7 Connector Mx for connection of external feedback 8 Main supply connector M 9 Square ring 7.6 x.68 ( pcs.), supplied in delivery packet Cover of connector Mx for programming Plastic box with integrated electronics Plug screw for valve with one solenoid, HEX, configurations Z, Z 7(.8) Solenoid a Solenoid b Manual overrideí Name plate mounting holes 6 Solenoid fixing nut 6(.) (66.6)(.)) 9 7 Connector Mx for connection of external feedback 8 Main supply connector M 9 Square ring 7.6 x.68 ( pcs.), supplied in delivery packet Cover of connector Mx for programming Plastic box with integrated electronics Position sensor 66(.6) Required surface finish of interface 9
Spare Parts.... Solenoid coils. Solenoid retaining nut with seal.. Electrical connector EN 7-8.. Electrical connector M.. Electrical connector Mx.. Electrical connector GWF.. Cover of connector Mx. Seal kit. O-ring 6. Mounting bolts. 6.. Solenoid coil Solenoid type Caution! The packing foil is recyclable. The protective plate can be returned to manufacturer. The technical information regarding the product presented in this catalogue is for descriptive purposes only. It should not be construed in any case as a guaranteed representation of the product properties in the sense of the law. ARGO-HYTOS s.r,o, CZ - Vrchlabí Tel.: +-99-, Fax: +-99- E-mail: sales.cz@argo-hytos.com www.argo-hytos.com Ordering number 686 686. Solenoid retaining nut with seal Type of the nut Seal ring Ordering number Standard nut 8 x. 87.. Electrical connector EN 7-8 Type designation Type Maximum input voltage Connector A grey Connector B black Ordering number K without rectifier - M6x. (bushing bore -6 mm) V DC 66 6.. Electrical connector M - 7PIN (female) Ordering number 79.. Electrical connector Mx- PIN (male), it presented only for E and ES configurations Ordering number 89.. Electrical connector GWF Ordering number 8897.. Cover of connector Mx Ordering number 96. Seal kit Type Dimensions, number Square ring O-ring Order number Standard - NBR7 7.6 x.68 ( pcs.) 6 x, ( pcs.) 878 Viton 7.6 x.68 ( pcs.) 6 x. ( pcs.) 87. O-ring Standard - NBR7 8 x ( pc.) 7 6. Mounting bolts Dimensions, number Tightening torque Ordering number M x DIN 9-.9 ( pcs.) Nm (.7 ft-lbs ) 876 Subject to alteration without notice!