PRM7-06
10Pages

Proportional Directional Control Valves Compact design Operated by proportional solenoids High sensitivity and slight hysteresis Digital control Installation dimensions to DIN 24 340 / ISO 4401 / CETOP RP121-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 175301-803, with the position sensor output being connected by the G4W1F 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 175301-803, connector. The connection of the supply voltage, control signal, program input and external output of the position sensor is realized by a 5-pin connector (ELKA 5012). The connection of the external feedback is provided by a 5-pin connector, which also has three supply voltages +24 V, +10V and -5V for an external sensor available. The solenoid coils, including the control box, can be turned in a range of ± 90o.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: 1. Proportional directional valve 2. Only with the internal feedback from the spool position sensor. 3. Only with the external feedback (pressure sensor, position sensor, etc.). 4. 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 232. It is necessary to order a cable in accordance with appropriate ordering number as mentioned on page 4. 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 232 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 Proportional directional control Nominal size Spool Symbols without designation S01 position sensor with voltage outlet S02 position sensor with current outlet E01 proportional directional valve without proportional directional valve with position feedback proportional directional valve with external feedback proportional directional valve with position and external feedback Nominal solenoid supply voltage ** Cannot be supplied as Variant S2 Nominal flow rate at Ap = 10 bar Model for cylinders with asymmetric piston rod, piston area ratio 1:2 Connectors are to be ordered...

Technical Data Nominal size Max. operating pressure at ports P, A, B Max. operating pressure at port T Hydraulic fluid Hydraulic oils of power classes (HL, HLP) to DIN 51524 Fluid temperature range (NBR / Viton) Viscosity range Maximum degree of fluid contamination Nominal flow at Dp = 10 bar (145 PSI) Hysteresis - open loop Hysteresis - closed position loop Mounting position Technical Data of Position Sensor - Voltage Outlet Operating pressure Electric connection electrical connector G4W1F Hirschmann * Contact assignment 1 - Power supply 2 - Command signal 3 - GND 4 - not used Enclosure...

Technical Data of Position Sensor - Current Outlet Linearity Operating pressure Electrical connection electrical connector G4W1F Hirschmann * 1 - Power supply 2 - Command signal 3 - GND 4 - not used Contact assigment Operatin voltage Output signal range Output signal range used: 0 position 1 solenoid - stroke 2.8 mm (0.11 in) 2 solenoids - stroke ± 2.8 mm (0.11 in) Additional output signal error: - at temperature change from +10 ... 55 °C (50 ...131 °F) - at imjpedance change from 50% - at input voltage change in the range of operating voltage Limit frequency at 3 dB amplitude decrease...

Limit Power Nominal flow 8 L/min (2.11 GPM) Nominal flow 5 L/min (1.32 GPM) Flow Characteristics Nominal flow 30 L/min (7.93 GPM) (18.5) Nominal flow 15 L/min (3.96 GPM) (13.2) Measured at input pressure D p =10 bar (145 PSI) , n = 32 mm /s (156 SUS) Command value [%]

Flow Characteristics Measured at n = 32 mm /s (156 SUS) Dp=Valve pressure differential (inlet pressure pV minus load pressure and return pressure pT) Dpn = Valve pressure differential for nominal flow Qn

closed position loop, for E02S01 model Frequency Reponse Connector Connection Connector K1- type M23 (male) PIN Technical data * Power supply input 1 * Ground (power supply) 2 Control signal 3 Ground (signal) 4 Power reference signal 5 Control signal of position sensor spool 6 * Protection earth lead (PE) 7 * Recommended min. lead cross section 0.75mm Connector K2 - type M12x1 (male) PIN Technical data Description TxD standard 1 RxD RS 232 2 Ground (signal) 0V 3 Not used 4 Connector K3 - type M12x1 (female) PIN Technical data Power supply output 1 Signal of external feedback 2 Ground 3 Not...