Woodward 8440-1546 MFR-2 Multifunction Relay

Description

Key Technical Specifications

Woodward’s legacy-equipment replacement information identifies 8440-1546 as MFR2S45B/A2CDD06D09HI1I4JK24MM, an MFR-2 multifunction relay from the older H8 microprocessor generation. The documented replacement is 8440-1936, easYgen-3500-5/P2.

The part is obsolete, with the listed last-time-buy date of January 23, 2015. This is important when evaluating surplus stock: a unit described as “new” may be unused legacy inventory rather than current production.

Product Introduction

The Woodward 8440-1546 is an MFR-2 multifunction relay, specifically configuration MFR2S45B/A2CDD06D09HI1I4JK24MM. It belongs to Woodward’s older H8-based generation of generator monitoring, control, and protection equipment.

This exact configuration has a documented migration path to 8440-1936, easYgen-3500-5/P2. That does not make the two units plug-compatible. A modernization normally requires checking CT/PT inputs, discrete I/O, breaker control, communications, protection settings, and the existing switchgear wiring before selecting the replacement architecture.

8440-1546

8440-1546

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation

Estimated time: 30–45 minutes

1. Notify operations and place the generator in its approved maintenance state.
2. Apply the plant’s LOTO procedure.
3. Isolate the control power and all applicable generator energy sources.
4. Verify absence of hazardous voltage with an appropriately rated multimeter.
5. Wear an ESD wrist strap.
6. Prepare:
   • Digital multimeter
   • PH1 screwdriver
   • Wire labels
   • Camera/phone
   • Generator single-line diagram
   • Existing MFR-2 configuration
   • Protection-setting records
7. Photograph the complete 8440-1546 front panel and terminal wiring.
8. Record the complete part number and configuration string.
9. Record CT/PT ratios, breaker-control wiring, relay assignments, and communications settings.

⚠️ Do not rely on the abbreviated part number alone. The configuration string after the MFR2S45B designation determines the actual equipment arrangement.

Stage 2: Removing the Old Module

Estimated time: 20–30 minutes

1. Confirm the generator cannot start or close its breaker unexpectedly.
2. Verify all required circuits are isolated.
3. Label every field connection.
4. Photograph each terminal group before removal.
5. Record CT and VT/PT wiring separately.
6. Disconnect control wiring carefully.
7. Disconnect communications wiring if installed.
8. Release the panel mounting hardware.
9. Remove the 8440-1546.
10. Inspect the panel wiring and terminal hardware for heat damage, loose conductors, or corrosion.
11. Keep the original unit available until commissioning is complete.

⚠️ CT circuits require particular care. Never leave an energized current-transformer secondary open. Follow the site’s CT shorting and isolation procedure before disconnecting protection equipment.

Stage 3: Installing the New Module

Estimated time: 30–60 minutes

1. Verify the replacement part and configuration.
2. Confirm that the physical replacement is an exact 8440-1546 or an approved engineered replacement.
3. Mount the replacement securely.
4. Reconnect control-power wiring.
5. Reconnect CT/PT inputs according to the approved drawings.
6. Reconnect breaker-control outputs.
7. Reconnect generator and bus sensing circuits.
8. Reconnect discrete I/O.
9. Reconnect communications.
10. Verify shielding and grounding.
11. Check terminal torque.
12. Perform continuity and polarity checks.

If migrating to 8440-1936:

1. Do not treat 8440-1936 as a pin-for-pin replacement.
2. Obtain the Woodward replacement documentation.
3. Map every old MFR-2 I/O point to the easYgen configuration.
4. Transfer protection settings manually.
5. Confirm CT/PT scaling.
6. Confirm breaker-control logic.
7. Confirm generator synchronization and load-sharing requirements.
8. Validate communication mapping.
9. Perform a complete functional test before returning the generator to service.

Woodward’s documented cross-reference identifies 8440-1936 / easYgen-3500-5/P2 as the recommended replacement for 8440-1546.

Stage 4: Power-On & Testing

Estimated time: 60–120 minutes

1. Complete a pre-power inspection.
2. Verify control-power voltage.
3. Energize the control system.
4. Check for diagnostic or configuration faults.
5. Verify voltage measurements.
6. Verify current-transformer inputs using the approved test method.
7. Verify generator and bus voltage sensing.
8. Check frequency and phase measurements.
9. Test discrete inputs.
10. Test relay outputs using the approved commissioning procedure.
11. Verify breaker open/close control.
12. Verify alarm and trip functions.
13. Confirm protection settings.
14. Test communications where used.
15. Perform a controlled generator start.
16. Verify synchronization and breaker operation.
17. Record final commissioning results.

⚠️ Do not perform a live breaker test simply to confirm an output relay. Use the approved generator-control test procedure and coordinate with operations before any switching operation.

Frequently Asked Questions (FAQ)

1. What is Woodward 8440-1546?

The 8440-1546 is an multifunction relay, configured as MFR2S45B/A2CDD06D09HI1I4JK24MM. It belongs to Woodward’s legacy H8-generation generator control and protection equipment.

2. Is 8440-1546 obsolete?

Yes. Woodward’s legacy replacement information identifies the generation as obsolete, and the cross-reference records January 23, 2015 as the last-time-buy date for 8440-1546.

3. What replaces Woodward 8440-1546?

The documented replacement is 8440-1936, easYgen-3500-5/P2. It is a migration path rather than an assumption of mechanical or electrical plug compatibility. The existing generator protection and control scheme must be reviewed before migration.

4. Can I directly replace 8440-1546 with 8440-1936?

Not as a simple pin-for-pin swap. The two belong to different product generations. I/O mapping, protection parameters, breaker logic, communications, and CT/PT configuration should be reviewed and tested before commissioning.

5. What does the full MFR2S45B configuration mean?

The /A2CDD06D09HI1I4JK24MM string identifies the specific configuration associated with 8440-1546. For procurement, use the complete configuration rather than only “” because other variants exist.

6. Can I buy a new original 8440-1546?

Unused legacy inventory can still exist after production has ended. However, “new” should mean the physical unit is unused; it does not mean the part is current-production equipment. Request the actual nameplate, serial number, packaging photographs, and storage history before purchasing.

7. What should I verify before ordering a replacement?

Verify 8440-1546, the complete configuration, serial number, terminal arrangement, CT/PT ratios, firmware or hardware revision, protection settings, and existing generator-control architecture. If the original unit is unavailable, compare the application against the documented 8440-1936 easYgen-3500-5/P2 migration path rather than ordering solely by physical appearance.