PWM (Pulse Train) Input (PWM)
A DIN rail-mount style control amplifier for controlling HydraForce proportional valves. Remote mounting in a protected enclosure is required.
Product Operation
This control module uses closed-loop current control with superimposed dither to supply a proportional valve solenoid with a proportional control signal. The input
signal to this controller can be from a PWM (pulse train) source.
Product Features
• Adjustments and connections clearly labeled.• 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 input voltage or coil resistance.
• Independent ramp adjustments.• Filter eliminates electrical noise.
• 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: 250 to 5000 Hz PWM (pulse train); 5% to 95% duty cycle; Low < 1.5 volts; High > 3.5 volts; 50 volts maximum
Input Resistance: 9.7K Ohms
Output Current: up to 2000 mA (see ordering info.)
Minimum Current Range: 0–500 mA (adjustable)
Maximum Current Range: 600–2000 mA (adjustable)
Ramp Up and/or Down: 0.01–5.0 seconds (independently adjustable)
Dither Frequency: 70–350 Hz (±10%)
Dither Amplitude: 0–10% of maximum current (adjustable)
Operating Conditions: –20° to 85°C; 0 to 85% relative humidity
3.437.1
Proportional Valve Controller—DIN Rail Mount—
SCHEMATICDITHERGENERATORSOLENOIDOUTPUTACTIVEREVERSE POLARITYPROTECTIONINPUT SIGNALNORMALIZATIONAND PWM TOVOLTAGECONVERSIONCURRENT SENSING AND SHORT CIRCUITPROTECTION24 VPS POWERGND+–+–S2S1 0–2.0 AMPSOUTRAMPUPRAMPDOWNERRORAMPLIFIER+–INDEPENDENTRAMP CONTROLFUNCTION HIGHFREQUENCYPWMOUTPUTSTAGEPWM INPUTPWM GNDENABLECONTROLSECTIONPOWER SUPPLY& REFERENCE(9-32 VDC)+10 V–10 V+5 V REF.I-MAX.DITHERLEVELI-MIN.R3R4R6R10R5R8R7R9–7.5 VR2DITHER FREQUENCYR1
GENERAL SPECIFICATIONS
Weight: 25 g (0.88 oz.)
Connections: Screw terminals for 16–30 AWG wire
