Woodward 8444-1109 MFR300 Multifunction Relay & Measuring Transducer

Woodward 8444-1109 MFR300 Multifunction Relay

Configured for power parameter monitoring and protection in industrial distribution networks, the Woodward 8444-1109 (MFR300 Multifunction Relay) provides direct physical and electrical execution of multi-phase voltage and current measurement.

Hardware Specifications

Actuator Loop Feedback and Thermal Dissipation

The 8444-1109 employs high-frequency sampling to process actuator loop feedback for system protection. The unit utilizes internal thermal heat sink dissipation profiles to maintain component integrity during prolonged operation in high-load power monitoring scenarios. Given the Class 0.5 accuracy rating, internal circuitry is calibrated to minimize thermal drift across the operating range. Ensure the metal housing maintains direct mechanical contact with the mounting rail to utilize the chassis as a secondary heat dissipation medium, mitigating internal temperature spikes that could affect measurement precision.

Frequently Asked Questions (FAQ)

Q: Can the communication protocols be utilized simultaneously on the MFR300 platform?

A: The device manages data transmission via Modbus RTU, CANopen, and Ethernet. Users must verify the specific firmware version and register mapping to ensure deterministic communication cycles if multiple protocols are active, as bus latency can fluctuate based on network traffic load.

Q: What are the installation requirements to maintain the rated measurement accuracy?

A: Adherence to shielded cabling standards for all analog current and voltage inputs is mandatory. Shielding must be terminated at a single common ground point to prevent ground loop currents, which introduce noise and degrade measurement accuracy below the specified Class 0.5 threshold.

Field Installation Guidelines

1. Mounting: The unit supports DIN-rail or panel mounting. Ensure the mounting surface is rigid to prevent mechanical stress on the terminal blocks.
2. Grounding: Secure the metal chassis to the local protective earth (PE) bus. High-frequency noise suppression is optimized when the chassis ground path is kept under 0.5 ohms.
3. Wiring: Separate high-voltage inputs from low-voltage communication lines (CANopen/Ethernet). Use twisted-pair shielded cables for communication to maintain signal integrity in electromagnetic fields.
4. Environment: While the unit functions up to +70 deg C, avoid placement near high-heat exhaust sources. Ensure an air gap of at least 50 mm surrounding the housing to facilitate natural convection.