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EHST-3-40 Series

EHST-3-40 Series
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Proportional Pressure Control Valve with Integrated Electronics

A Note: The -40 design series product has been designed and tested to meet specific standards outlined in the European Electromagnetic Compatibility Directive as specified by EN 50 082-2; emission, and EN 50 082-2; susceptibility. For installation requirements, refer to Installation Wiring Practices for Vickers Electronic Products leaflet 2468. Description The EHST-3 is a high performance electro-hydraulic proportional relief valve with integral electronics. The valves' extremely linear performance is attributed to a unique innovative design which includes “frictionless” mechanical design,...

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Maximum pressure envelope Set by on-board potentiometer “Pmax” Pressure override: bar (psi) Valve Set Pressure over-ride type pressure at 1 l/min at 2 l/min Bias setting Relative to max. pressure, and set by on-board potentiometer “Pcorr” Pressure bias, EHST-3-**E Pcorr max. 0s 0 CD £= 03 0 P corr (/) 0 CL Pcorr min. 0 100 Input signal (%) Temperature drift: bar (psi) Valve Set pressure Drift coefficient A Reduction from A Pressure reduces as temperature increases; pressure increases as temperature reduces. Valve Frequency Frequency Input signal (%)

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Configuration EHST valves are pre-configured by model code when ordered from the factory. Configuration options include selection of command input type (voltage or current), and output bias (command or pressure). These configurations can be field selected by setting the configuration jumpers on the internal circuit board. Refer to the chart on this page for the required jumper positions, and the circuit board illustrations for placement. Warning: Disconnect the valve electrical connector before making any jumper changes. Potentiometer Adjustments Two adjustments are provided on the internal...

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Installation – Electrical Wiring Wiring connections are made to the EHST via a 6-pin plug connector. Note that the minimum wire gage specified is for applications less than 30 meters (100 feet). Consideration should be given for additional installed length, and mechanical robustness. Mating Connector Type: MS3106A-14S or C 105 Plug (connections shown are solder side) A F Plug (solder side) E Electrical plug pins A – not used B – not used C – chassis gnd D – +24 VDC power supply E – 0V (Ground) F – Command (input) 0 to +10 VDC (EHST-3-*V* models) 4 to 20 mA (EHST-3-*I* models) Wire 0,5/1,5...

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Installation Dimensions 146 (5.75) 4 holes ∅ 5,6 (0.22 dia) through: ∅ 10 (0.39 dia) counterbore O-ring recesses only in location of (non-functional) ports A and B Y Y O-rings (4 req’d) supplied with valve Mounting bolts & subplates Metric bolts/G(BSPF) ports: Bolt kit . . . . . . . . . . . . . . . . BK991917 Rear entry subplate . . . . . DGVM-3-10-R Side entry subplate . . . . . DGVS-3-1E-10-R Inch (UNC) bolts/SAE ports: Bolt kit . . . . . . . . . . . . . . . . BKMOD 617 Rear entry subplate . . . . . DGVM-3-10-S Side entry subplate . . . . . DGMS-3-1E-10-S Fluid Cleanliness Proper fluid...

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Incorrect Pressure Output EHST is installed correctly Hydraulic supply is correct Hydraulic connections are correct Pilot flow is adequate EHST jumpers are correct Electrical connections are correct + 24 VDC power (Pin D) Command signal (Pin F) Ground (Pin E) 7) Misadjusted P–corr 8) Misadjusted P–max 9) Contamination in fluid 10) Contamination induced into electronics cavity J 11) Piloted valve malfunction After Installation EHST is installed correctly Hydraulic supply is correct Hydraulic connections are correct Pilot flow is adequate EHST jumpers are correct Electrical connections are...

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