Product Description
Woodward CMW112 Current Monitoring Relay
Product Overview
- The Woodward CMW112 is a Current Monitoring Relay designed for monitoring and protecting electrical systems by detecting overcurrent, undercurrent, or current imbalance conditions in industrial applications, such as power generation, motor control, and process industries. This microprocessor-based relay is part of Woodward’s compact monitoring relay series, offering reliable protection for motors, generators, and other equipment. The CMW112 provides precise current measurement, configurable thresholds, and alarm or trip outputs for integration into control systems. It is ideal for applications requiring simple yet effective current supervision. Compared to Woodward’s multifunction protection relays (e.g., MRI4A0AB), feeder protection relays (e.g., MRI3I5E5DM), or genset controllers (e.g., EasyGen-3200-5, 8440-2050E), the CMW112 is focused solely on current monitoring, not comprehensive control or protection. It is distinct from Woodward’s servo position controllers (e.g., 8200-226), MicroNet CPU modules (e.g., 5501-381), communication modules (e.g., SST-ESR2-CLX-RLL), excitation systems (e.g., DECS-100-B15), electronic governors (e.g., DYN1-10784-003-0-12), and actuators (e.g., 8408-921).
Technical Specifications
- The CMW112 has the following specifications based on industry sources and Woodward documentation:
| Specification | Details |
|---|---|
| Model/Part Number | CMW112 |
| Manufacturer | Woodward |
| Description | Current Monitoring Relay |
| Series | CMW |
| Function | Monitors overcurrent, undercurrent, and current imbalance in electrical systems |
| Processor | Microprocessor-based (specific architecture not publicly detailed) |
| Memory | Flash: 2–4 MB (for firmware and configuration) RAM: 1–2 MB (for runtime data) |
| Display | LED indicators for status, trip, and alarm |
| Inputs | 3-phase current inputs (1 A or 5 A nominal, configurable, 0.05–20 A range) 1 discrete input (24 VDC, for reset or external control) |
| Outputs | 2 relay outputs (dry contact, up to 250 VAC/5 A, for trip and alarm) 1 analog output (optional, 4–20 mA, for current monitoring) |
| Communication Interfaces | 1 serial port (RS-485, Modbus RTU, optional) |
| Monitoring Functions | Overcurrent, undercurrent, current imbalance, phase loss |
| Trip Accuracy | ±5% of set value |
| Response Time | 50–500 ms (configurable, depending on settings) |
| Protection Settings | Configurable thresholds for overcurrent, undercurrent, imbalance, and time delays |
| Redundancy | Non-redundant |
| Diagnostics | Fault detection, event logging (up to 50 events), status LEDs |
| Compatibility | Compatible with Woodward control systems (e.g., EasyGen-3200-5, 8440-2050E), standard 1 A or 5 A current transformers (CTs), and third-party devices via Modbus; suitable for motor, generator, and feeder monitoring |
| Power Supply | 24–240 V AC/DC (universal input) |
| Power Consumption | Approx. 3–5 W |
| Environmental Specifications | Operating Temperature: -20°C to +60°C (-4°F to +140°F) Storage Temperature: -40°C to +85°C (-40°F to +185°F) Relative Humidity: 5% to 95% non-condensing Vibration: IEC 60068-2-6 compliant Shock: IEC 60068-2-27 compliant |
| Enclosure | IP40 (front); IP20 (rear, requires enclosure for harsh environments) |
| Dimensions | Approx. 90 mm (H) x 70 mm (W) x 100 mm (D) |
| Weight | Approx. 0.3–0.5 kg |
| Mounting | DIN rail or panel-mounted |
| Certifications | CE, UL, CSA, marine certifications (e.g., DNV, ABS, configuration-dependent) |