WOODWARD 9907-027 Replacement for EasyGen Load Sharing

Product Overview

WOODWARD 9907-027 Replacement & Upgrade Solution for EasyGen Load Sharing Series: Smooth Transition from Legacy Parallel Genset Control

The WOODWARD 9907-027 Load Sharing Module has long served as a cornerstone of parallel generator set control systems across power plants, marine vessels, data centers, and industrial facilities. As this module approaches end-of-life or becomes increasingly difficult to source, plant engineers and procurement teams face a critical decision: how to replace or upgrade the 9907-027 without disrupting existing wiring infrastructure, communication architecture, or generator synchronization logic. This page provides a comprehensive migration guide for facilities transitioning away from the legacy 9907-027 to a compatible replacement or modern equivalent within the WOODWARD EasyGen ecosystem.

TOPNLMS supplies the WOODWARD 9907-027 as a direct replacement unit — tested, verified, and ready to ship from Xiamen — alongside compatible upgrade pathways for customers who require a modernized load sharing solution. Whether your application demands a like-for-like swap or a full control architecture upgrade, our technical team can support the transition from initial assessment through to commissioning.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from the WOODWARD 9907-027 rarely involves the module in isolation. In most parallel genset control panels, the 9907-027 operates alongside a suite of interconnected components that must be evaluated for compatibility during any upgrade or replacement project.

In systems where the 9907-027 interfaces with a WOODWARD EasyGen-300 or EasyGen-3000 series genset controller, the load sharing bus wiring typically runs through a dedicated LSM terminal block on the controller’s I/O board. When replacing the 9907-027, engineers should verify that the EasyGen controller’s load sharing input parameters — including droop percentage, rated load reference, and synchronization mode — are correctly configured to match the replacement module’s output characteristics. In many cases, the EasyGen-3500 series offers a direct upgrade path with expanded CAN bus communication and integrated load sharing logic that can eliminate the need for a standalone 9907-027 entirely.

For facilities running older WOODWARD 2301A or 2301D load sharing and speed control units in parallel with the 9907-027, the migration process requires careful attention to the analog load sharing line voltage levels. The 2301A and 2301D use a 0–3 VDC load sharing signal, and any replacement module must be verified to operate within this range to avoid load imbalance or hunting between generator sets. In some retrofit projects, a signal conditioning module or load sharing interface adapter is inserted between the legacy 2301-series controller and the new module to ensure signal compatibility without rewiring the entire panel.

Communication architecture is another critical consideration. Sites that have already migrated portions of their genset control system to Modbus RTU or CAN J1939 — for example, using a WOODWARD MicroNet TMR or a third-party SCADA gateway — may find that the analog-only 9907-027 creates a protocol gap in the system. In these cases, upgrading to a module with native Modbus RTU support allows the load sharing data to be integrated into the plant DCS or SCADA system without additional protocol converters.

Power supply integrity is equally important during the transition. The 9907-027 operates on 18–32 VDC, and the control panel’s 24 VDC power supply module must be verified to have sufficient current capacity to support both the replacement load sharing module and any additional I/O modules added during the upgrade. If the existing power supply is marginal, a higher-capacity 24 VDC DIN rail power supply should be installed before commissioning the new module.

For sites where the 9907-027 is mounted in a WOODWARD or third-party genset control cabinet alongside components such as a synchronizing relay, a dead bus relay, a reverse power relay, and a generator protection relay (such as a SEL-300G or equivalent), the physical space audit is straightforward — the 9907-027’s DIN rail footprint is compact, and most replacement modules maintain the same or smaller form factor. However, if the upgrade includes adding a new HMI panel or a remote monitoring gateway, additional DIN rail space and cable management provisions may be required.

Finally, for facilities that maintain a spare parts inventory for their genset control systems, the transition away from the 9907-027 is an opportunity to rationalize the spare parts list. Stocking a compatible replacement module that also serves as a drop-in spare for the EasyGen-300 series load sharing input board can reduce inventory complexity and procurement lead times across multiple generator sets on the same site.

Retrofit Guidance FAQ

Q: Can I replace the 9907-027 without modifying the existing wiring harness?
A: In most cases, yes. The 9907-027 uses a standard terminal block connector, and compatible replacement modules maintain the same pin assignment for power supply, load sharing line, speed reference output, and droop adjustment inputs. Always verify the wiring diagram against the replacement module’s terminal assignment before powering up.

Q: Do I need to modify the PLC or DCS program when replacing the 9907-027?
A: For a like-for-like analog replacement, no PLC or DCS program changes are required. The 9907-027 operates as a hardware module on the analog load sharing bus and does not communicate digitally with the plant control system. If you are upgrading to a module with Modbus RTU or CAN bus capability, additional configuration of the communication interface will be required.

Q: What communication protocols does the 9907-027 support, and what are the upgrade options?
A: The 9907-027 uses an analog load sharing line (LSM bus) for inter-generator communication. It does not support digital protocols natively. Upgrade options include modules with Modbus RTU, CAN J1939, or Ethernet/IP interfaces, which enable integration with modern SCADA and DCS platforms.

Q: Is the replacement module physically compatible with the existing control cabinet?
A: Yes. The replacement module maintains the same DIN rail mounting standard and a comparable form factor to the 9907-027. No panel cutout modifications or additional mounting hardware are required for a standard swap.

Q: How do I verify load sharing balance after installing the replacement module?
A: After installation, perform a no-load synchronization test followed by a graduated load test with all parallel generator sets online. Monitor the load sharing line voltage and adjust the droop potentiometer on each module until load distribution is within ±5% of rated load across all units. Document the final trim pot settings for future reference.

Q: What is the lead time and shipping arrangement for the 9907-027 replacement?
A: TOPNLMS maintains stock of the WOODWARD 9907-027 and compatible replacement modules in Xiamen. Standard orders ship within 1–3 business days via DHL, FedEx, or UPS Express. Expedited same-day dispatch is available for urgent breakdown situations. Contact us at [email protected] or +86 18359293191 for availability confirmation.

Warranty Assurance

Every WOODWARD 9907-027 unit and compatible replacement module supplied by TOPNLMS is covered by a 12-Month Warranty from the date of shipment. Our pre-shipment inspection process includes functional testing of the load sharing output signal, power supply input range verification, and connector integrity checks. Units that do not pass inspection are not shipped.

In the event of a warranty claim, TOPNLMS provides a replacement unit or full refund within the warranty period. Our after-sales response time is within 24 hours for email inquiries and within 4 hours for urgent breakdown situations communicated by phone. We maintain a dedicated spare inventory to support rapid replacement dispatch without waiting for return-to-manufacturer processing.

For procurement teams requiring documentation, we can provide test reports, packing lists, commercial invoices, and certificates of origin for customs clearance. All units are shipped in anti-static packaging with individual serial number tracking to support your asset management and maintenance records.

TOPNLMS is committed to supporting industrial facilities through every stage of their control system lifecycle — from sourcing hard-to-find legacy components to guiding full system modernization projects. Our technical team is available to assist with compatibility assessments, wiring diagram reviews, and commissioning support for WOODWARD load sharing module replacements and upgrades.