Faber‑Com STU‑PWMi (PSCH528R) — PWM Proportional Control Card

Product Description

The STU‑PWMi is a high‑performance electronic regulator card used to drive proportional solenoid valves via PWM (pulse width modulation). It accepts multiple analog inputs and provides matched PWM outputs, making it suitable for complex hydraulic control systems in mobile and industrial machinery.

The PSCH528R designation is commonly used as the article or part number for the STU‑PWMi control card configured for 8 proportional outputs (i.e. 8 analog inputs → 8 pairs of PWM outputs).

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Key Features & Capabilities

• Drives up to 8 proportional functions (with 8 + 8 PWM outputs) — effectively a pair of outputs per analog input.
• Accepts 8 analog control inputs (0 – 5 V range) for proportional commands.
• Offers enable and control signals:
  • One “Control Panel On” enable input
  • Two additional enable inputs with auxiliary control roles
  • Optional Fast/Slow mode select input
  • Three digital ON/OFF inputs which can drive output relays directly
• Provides a Dump Valve output that is driven when any proportional movement occurs; its turn‑off delay is programmable to manage pressure surges.
• Includes a FAULT output to signal analog input errors or internal issues.
• Parameters such as deadband, stroke thresholds, minimum/maximum output currents, ramp‑up and ramp‑down times, PWM frequency are all configurable.
• Built‑in 5 V stabilized supply for powering external potentiometric joystick inputs (maximum ~50 mA).

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Technical Specifications

Parameter	Value / Range
Supply Voltage	10 – 30 V DC
Quiescent Current (no load)	≈ 300 mA
Maximum Output Load Current	Up to 7.5 A across PWM outputs
PWM Current Range	100 mA to 2,500 mA per channel
PWM Frequency Options	50, 60, 70, 85, 100, 125, 150, 200, 250, 300 Hz
Input Impedance	~11 kΩ toward 2.5 V reference
Operating Temperature	–20 °C to +70 °C (some references say –40 to +70)
Dimensions (with connector)	256 × 210 × 45 mm
Mounting Hole Pattern	242 × 142 mm, holes ø 6 mm (4 holes)

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Typical Applications & Use

• Centralized proportional control in mobile machines (cranes, aerial platforms, material handlers)
• Systems requiring multiple proportional hydraulic channels, driven from joystick or analog control modules
• Situations where integrated dump valve control, soft start/stop ramping, and multiple safety interlocks are needed
• Environments requiring modular and configurable electrohydraulic control