PWDXXA-400-22 | Parker Proportional Amplifier 22A Peak LVDT Closed-Loop

PWDXXA-400-22

Product Overview

The PWDXXA-400-22 is a Parker Hannifin PWDXXA series digital closed-loop power amplifier, specifically designed to drive proportional directional valves with LVDT spool position feedback. This module is the core component of hydraulic closed-loop control systems, achieving precise spool position control through internal high-precision closed-loop regulation.

The PWDXXA-400 series electronic modules combine all necessary functions for the optimal operation of proportional directional control valves with position sensors or in closed-loop systems. The PWDXXA-400-22 features DIN rail mounting with compact construction and disconnectable terminals for easy installation and time-saving wiring.

Model Code Breakdown (PWDXXA-400-22):

• PWDXXA: Closed-loop digital power amplifier (with LVDT feedback)

• 400: Series code

• 22: 22A peak starting current (0.2 ms), continuous current 0.8–3.5A

As an original Parker digital closed-loop proportional amplifier, this product offers complete interchangeability within the same series and size, requiring no modifications to system configuration or wiring.

Technical Specifications (Bulleted List)

• Model: PWDXXA-400-22

• Brand: PARKER (Parker Hannifin)

• Series: PWDXXA-400 Series

• Product Type: Digital Closed-Loop Power Amplifier

• Supply Voltage: 18–30 VDC (typical 24V)

• Max. Supply Current: 2 A

• Recommended Fuse: 2.5A

• Peak Starting Current: 22 A (0.2 ms)

• Continuous Output Current: 0.8–3.5 A (adjustable: 0.8 / 1.3 / 1.8 / 2.7 / 3.5A)

• Control Input: ±10 VDC (Ri=100 kΩ) / ±20 mA / 4–20 mA (Ri=200 Ω)

• Feedback Signal: LVDT spool position signal (closed-loop correction) 

• Dither Frequency: 0–800 Hz (adjustable)

• Dither Amplitude: 0–100% (adjustable)

• Ramp Time: 0–32.5 s (independently adjustable in four quadrants)

• Interface: USB-B (ProPxD free software programming), RS232

• Mounting: DIN rail mount (EN 50022) 

• Dimensions: 110 × 45 × 75 mm

• Operating Temperature: -20°C to +60°C

• Protection Class: IP20 (per EN 60529)

• Flame Rating: UL94 V0

• Weight: Approx. 0.16 kg

Key Technical Advantages

1. LVDT Closed-Loop Feedback Control — Extremely High Positioning Accuracy

The PWDXXA-400-22 features LVDT (Linear Variable Differential Transformer) spool position feedback, continuously monitoring spool position and comparing it with the command value. Compared to open-loop control, the closed-loop design delivers extremely high repeatability, excellent drift resistance, and superior dynamic response.

2. High Current Drive Capacity for High-Flow Proportional Valves

Peak starting current reaches 22 A (0.2 ms) with continuous output current adjustable from 0.8–3.5 A. This powerful drive capability makes it compatible with a wide range of high-flow proportional directional valves with LVDT feedback, including Parker RV, REE*W, DUR, PRPM, VBY, VMY, and other series.

3. Flexible Command Signals with Four-Quadrant Ramp Function

Supports multiple command signal inputs including ±10V, ±20mA, and 4–20mA. The four-quadrant independently adjustable ramp function (0–32.5 s) allows separate acceleration and deceleration time settings, effectively optimizing system start/stop characteristics and reducing shock.

4. Constant Current Drive with Dither Optimization for Smooth Spool Response

Features constant current drive mode, ensuring solenoid force remains unaffected by coil temperature variations. Dither frequency (0–800 Hz) and amplitude (0–100%) are adjustable, effectively overcoming spool static friction and ensuring smooth response to small signal commands.

5. ProPxD Free Software for Easy Configuration

Connect to a PC via the USB-B interface and use Parker‘s ProPxD free software for parameter settings. Output current, zero point, gain, dither, and other parameters can be configured, with support for closed-loop auto-tuning. The intuitive software interface significantly reduces system commissioning time.

6. International Standard Compliance with High Installation Compatibility

Features DIN rail mounting (EN 50022) standards. Complies with EMC EN 50081-2 and EN 50082-2 standards. Protection class IP20. The compact modular design enables direct installation in standard control cabinets.

7. Legacy Replacement — Clear Upgrade Path

The PWDXXA-400 series replaces older models including PW18A-404, PW25A-404, and PW35A-404, providing a clear equipment upgrade and technology migration path.

Application Areas

• Injection Molding Machinery — High-precision closed-loop proportional control of injection speed and holding pressure

• Die-Casting Machines — Precision closed-loop proportional regulation of injection speed and pressure

• Steel Rolling Mills and Extrusion Presses — Precision position and speed closed-loop control for high-flow hydraulic systems

• CNC Machine Tools — Precision closed-loop proportional control for table feed and spindle drive

• Hydraulic Presses — High-precision closed-loop control of slide position and pressure

• Test Benches and Simulation Systems — Hydraulic test equipment requiring high-precision closed-loop control

Expert Maintenance Tips

1. Installation Guidelines

• PWDXXA-400-22 features DIN rail mounting (EN 50022) standards. Ensure the rail meets specifications before installation.

• Terminals are disconnectable for convenient wiring.

• Shielded cables are recommended for command signals and LVDT feedback signals to prevent electromagnetic interference affecting control precision.

2. Electrical Connection Specifications

• Supply voltage: 18–30 VDC (typical 24V), recommended fuse 2.5A.

• Command signal wiring: ±10V to terminals 5/6, 4–20mA to terminals 5/6 (Ri=200Ω).

• Solenoid A: terminals 9/10, Solenoid B: terminals 11/12.

• Enable signal: terminal 15 connected to 24V.

• Status output (fault/ready): terminal 16.

• Shield ground (PE): terminal 8.

3. ProPxD Software Configuration Tips

• Connect PC to the amplifier via the USB-B interface.

• Download ProPxD software free from Parker‘s website (www.parker.com/propxd)[reference:201].

• Configure output current (e.g., 1.8A), zero point, gain, dither, and other parameters.

• Perform closed-loop auto-tuning after connecting LVDT feedback.

• Set ramp times independently for start and stop.

4. Operating Environment Requirements

• Operating temperature range: -20°C to +60°C.

• Protection class: IP20 — suitable for installation inside control cabinets.

• Flame rating: UL94 V0 for electrical safety.

5. Periodic Maintenance Inspection

• Inspect terminal connections for looseness, oxidation, or moisture ingress every 2,000 operating hours or at least annually.

• Verify supply voltage remains stable within 18–30 VDC.

• If reduced control precision or slow response is observed, first use ProPxD software to check parameter settings and LVDT feedback signal status.

• Periodically inspect the module surface for signs of overheating or physical damage.

PWD00A-400 Series (PWD00A-400-19 / PWD00A-400-22 / PWD00A-400-30)

Product Overview

The PWD00A-400-19, PWD00A-400-22, and PWD00A-400-30 are core models in the Parker Hannifin PWD00A-400 series of digital open-loop power amplifiers, specifically designed to drive proportional directional valves without position sensors. This series is Parker‘s open-loop product line, complementing the PWDXXA closed-loop series with LVDT feedback.

The PWD00A-400 series digital amplifier modules combine all necessary functions for the optimal operation of proportional directional control valves without position sensors. Featuring DIN rail mounting with compact construction and disconnectable terminals, the modules are easy to install with time-saving wiring. The digital circuit design ensures good accuracy and optimal adaptability. Parameter configuration and system adaptation are easily accomplished via ProPxD free software.

Model Code Breakdown:

• PWD00A: Open-loop digital power amplifier (without position feedback)

• 400: Series code

• 19 / 22 / 30: Configuration/software version codes

Key Differences by Model:

As original Parker digital open-loop proportional amplifiers, these products offer complete interchangeability within the same series and size, requiring no modifications to system configuration or wiring.

Technical Specifications (Bulleted List)

• Model: PWD00A-400-19 / PWD00A-400-22 / PWD00A-400-30

• Brand: PARKER (Parker Hannifin)

• Series: PWD00A-400 Series

• Product Type: Digital Open-Loop Power Amplifier

• Supply Voltage: 18–30 VDC

• Operating Current: 2.2 A

• Control Input: Differential input stage (voltage or current input)

• Command Channels: 4 programmable internal command values

• Ramp Function: Four-quadrant ramp function

• Interface: USB Type-B (ProPxD software programming)

• Status Output: With status output

• Enable Input: Enable input for solenoid driver

• Mounting: DIN rail mount (snap-on mounting) 

• Mounting Position: Unrestricted

• Body Material: Polycarbonate

• Max. Operating Temperature: 60°C

• Min. Operating Temperature: -20°C

• Protection Class: IP20 (per EN 60529)

• Flame Rating: V0 (per UL 94)

• EMC Standards: EN 50081-2, EN 50082-2

• Electrical Connection: Disconnectable screw terminals (0.2–2.5 mm²)

• Recommended Cable: Power/solenoids 1.5 mm² overall braid shield (AWG16) ; sensor/signal 0.5 mm² overall braid shield (AWG20) 

• Max. Cable Length: 50 m

• Weight: 0.16 kg

Key Technical Advantages

1. Digital Circuit Design — High Accuracy and Optimal Adaptability

The PWD00A-400 series features digital circuit design, offering higher precision and stability compared to analog amplifiers. Parameter configuration is easily accomplished via ProPxD free software for optimal matching with proportional directional control valves.

2. Open-Loop Control — Cost-Effective and Efficient

The PWD00A-400 series is designed for open-loop control (without position sensors) , suitable for cost-effective applications where LVDT feedback is not required. Compared to closed-loop solutions, the open-loop design is simpler to commission and more cost-effective — an ideal choice for industrial automation systems.

3. Four-Quadrant Ramp Function — Optimized Start/Stop Characteristics

The four-quadrant ramp function allows independent acceleration and deceleration time settings. Effectively reduces hydraulic shock during system start/stop, protecting actuators and piping.

4. Flexible Command Signals with Multi-Channel Control

Supports differential voltage or current inputs, compatible with various industrial control systems. 4 programmable internal command values provide flexible control solutions.

5. Compact DIN Rail Mounting Design

Features DIN rail mounting (snap-on) for compact installation. Equipped with disconnectable terminals for convenient, time-saving wiring. Mounting position is unrestricted.

6. International Standard Compliance for Global Use

Complies with EMC EN 50081-2 and EN 50082-2 standards. Protection class IP20. Flame rating V0 (UL 94) . Ensures safe and reliable operation in diverse industrial environments.

7. Legacy Replacement — Clear Upgrade Path

The PWD00A-400 series replaces older models including PW18A-404, PW25A-404, and PW35A-404, providing a clear equipment upgrade and technology migration path.

Application Areas

• Industrial Hydraulic Systems — Proportional directional valve drive for general hydraulic applications

• CNC Machine Tools — Proportional directional control for machine tool hydraulic systems

• General Presses — Proportional directional control for press hydraulic systems

• Injection Molding Machinery — Proportional directional control for auxiliary functions

• Industrial Automation Production Lines — Proportional hydraulic actuator control for automated production lines

• Compatible with Parker D1FB/D3FB, D*1FB, and other proportional directional valves without feedback

Expert Maintenance Tips

1. Installation Guidelines

• PWD00A-400 series features DIN rail mounting (snap-on) . Ensure the rail meets specifications before installation.

• Mounting position is unrestricted.

• Terminals are disconnectable screw terminals (0.2–2.5 mm²) for convenient wiring.

• Shielded cables are recommended for command signals to prevent electromagnetic interference affecting control precision.

• Maximum cable length: 50 m.

2. Electrical Connection Specifications

• Supply voltage: 18–30 VDC.

• Operating current: 2.2 A.

• Command signals: Differential input supporting voltage or current input.

• Enable input controls solenoid driver on/off.

• Status output provides fault/ready indication.

3. ProPxD Software Configuration Tips

• Connect PC to the amplifier via the USB Type-B interface.

• Download ProPxD software free from Parker‘s website (www.parker.com/propxd)[reference:276].

• Configure 4 programmable command values, ramp times, and other parameters via the software.

• Parameterization is intuitive and does not require specialized programming knowledge.

4. Operating Environment Requirements

• Operating temperature range: -20°C to 60°C.

• Protection class: IP20 — suitable for installation inside control cabinets.

• Flame rating: V0 (UL 94) for electrical safety.

5. Periodic Maintenance Inspection

• Inspect terminal connections for looseness, oxidation, or moisture ingress every 2,000 operating hours or at least annually.

• Verify supply voltage remains stable within 18–30 VDC.

• If reduced control precision or abnormal response is observed, first use ProPxD software to check parameter settings.

• Periodically inspect the module surface for signs of overheating or physical damage.