Description

Woodward 95DSS3-1CEX Dual Channel Digital Overspeed Speed Switch Module

Technical Specifications

• Product Model: 95DSS3-1CEX
• Brand: Woodward (Governor Controls, USA)
• Warranty: One Year
• Input Voltage: 18–32 V DC standard industrial control power supply
• Operating Temperature: -40°C to +70°C
• Storage Temperature: -45°C to +85°C
• Response Time: ≤15ms overspeed trip trigger response
• Protection Class: IP20 cabinet DIN rail mounting; CEx hazardous area explosion-proof certification
• Accuracy Class: ±0.5% full scale speed detection precision
• Input Frequency Range: 0–5000Hz magnetic pickup (MPU) sine wave speed signal
• Rated Current Range: Each relay contact rated 5A @250V AC resistive load
• Communication Interface: Euro-style screw terminal block, RS232 service calibration port
• Supported Protocols: Proprietary ACT calibration tool communication, dry relay discrete hardwired output
• Overload Capacity: Reverse power polarity protection, EMC surge suppression, relay short-circuit protection
• Dimensions: Standard compact DIN rail housing 120mm(L) × 75mm(W) × 110mm(H)
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Product Overview

The 95DSS3-1CEX is an explosion-proof dual independent channel digital speed monitoring and overspeed protection module upgraded from Woodward classic DSS series, specially designed for turbo machinery, internal combustion engines, diesel generator sets, gas compressors and steam turbine safety protection loops. The suffix CEX denotes ATEX/IECEx hazardous zone certified version, applicable to Zone 1/2 explosive gas and dust environments in petrochemical, offshore platform and refinery sites.

It receives rotational frequency signals from magnetic pickup sensors installed on engine flywheels or turbine gear wheels, with two fully isolated independent measuring channels to realize redundant speed detection and avoid single-point failure risk. Users can set two separate threshold points via on-board multi-turn potentiometers or PC-based ACT universal calibration software: typically underspeed warning for auxiliary equipment interlock, and critical overspeed shutdown to cut fuel supply, close trip valves and trigger emergency stop circuits to prevent mechanical destructive damage caused by runaway rotation.