4-20 mA Input (4)
A metal box-style control amplifier for controlling HydraForce proportional valves. The metal housing is IP67 rated. Remote mounting is required. This model is designed for circuits with long wire runs or where electrical interference is a problem.
Product Operation
This control module uses closed-loop current control with superimposed dither to sup-ply a proportional valve solenoid with a proportional control signal. The input signal to
this controller can be from a 4–20 mA source.
Product Features
• Adjustments accessible under removable cover.• LED indication of output power level, input level and power on/off.
• One unit covers supply voltages from 9 to 32 VDC.
• No internal fuses; circuit limits current electronically.
• Short circuit proof and reverse polarity protected.
• Can be disconnected from coil when powered.
• Maximum current adjustment does not affect minimum current setting.• Current sensing circuit maintains output current regardless of changes in output volt-age or coil resistance.• Filter eliminates electrical noise;
Independent ramp adjustments.
• Dither frequency and amplitude are adjustable for maximum valve performance.
Product Ratings
Supply Voltage: 9–32 VDC Coil rating must be matched with supply voltage: RCOIL ≤ (VSUPPLY – 1.5 V) / I-Max.
Control Input Signal Options: 4–20 mA current signal (see connection diagram)
Input Resistance: 33K Ohms
Output Current: up to 2000 mA (see ordering info.)
Minimum Current Range: 0–500 mA (adjustable; see ordering info.)
Maximum Current Range: 600–2000 mA (adjustable; see ordering info.)
Ramp Up and/or Down: 0.01–5.0 seconds (independently adjustable)
Dither Frequency: 70–350 Hz (adjustable)
Dither Amplitude: 0–10% of maximum current (adjustable)
Operating Conditions: –40° to 85°C; 0 to 85% relative humidity
3.432.1
Proportional Valve Controller—Metal Housing—
SCHEMATICSTEP-DOWNCONVERTERVPS TO 5.5 VSTEP-UPDC/DCCONVERTERINPUT, OUTPUTANDPOWER SUPPLYINDICATORSSOLENOIDOUTPUTDITHERAMPLITUDEACTIVEREVERSE POLARITYPROTECTIONDITHERGENERATORCURRENT SENSING AND SHORT CIRCUITPROTECTIONVPS POWERGNDCURRENT LOOP TRANSMITTER+–S2S1RMI-MAX.RAMP UPRAMP DOWNRMAX.ERRORAMPLIFIERLOWPASSFILTER+–RDARMIN.I-MIN.+5 VRDDITHER FREQUENCYRDITHERINDEPENDENTRAMP CONTROLFUNCTIONVOLTAGETO HIGH FREQUENCYPWMCONVERTERANALOG GNDCURRENT IN(4-20 mA)NOT USEDENABLENOT USED+12 V–12 V+5 V(9-32 VDC)CF
GENERAL SPECIFICATIONS
Metal Housing: Conformal coated; IP67 rated
Weight: Metal Box without cable: 400 g (14.1 oz.)
Connections: Mounted cable with unterminated wires provided; Length: Approx. 1.5 meters (59″)
