WOODWARD 9905-028 Replacement for EasyGen Series

Product Overview

WOODWARD 9905-028 Replacement for EasyGen Series: Smooth Transition & Legacy System Compatibility

The WOODWARD 9905-028 is a Load Sharing and Speed Control Module from the EasyGen generator control platform, widely deployed in diesel genset paralleling systems, co-generation plants, and industrial standby power installations worldwide. As original equipment manufacturers phase out legacy controller variants and end-of-life notices circulate across the power generation sector, plant engineers and procurement teams face increasing pressure to source verified replacement units that maintain full backward compatibility with existing wiring harnesses, communication buses, and control logic.

TOPNLMS stocks the WOODWARD 9905-028 as a direct replacement module, fully tested prior to shipment and backed by a 12-month warranty. Whether your facility is executing a like-for-like swap of a failed unit, planning a phased modernization of an aging genset control cabinet, or consolidating spare parts inventory ahead of a scheduled maintenance window, this module is engineered to slot into your existing EasyGen installation without requiring panel redesign or software re-architecture.

Compatibility Comparison Table

Seamless Upgrade Solutions

A successful migration from an aging EasyGen-based genset control system to a modernized architecture typically involves more than a single module swap. In practice, field engineers replacing the WOODWARD 9905-028 often simultaneously address adjacent components that have reached end-of-life or require reconfiguration to maintain system coherence.

On the communication side, facilities running Modbus RTU over RS-485 may need to verify or replace their serial communication cables and terminal resistors, particularly if the existing wiring dates back more than a decade. Where the control system integrates with a SCADA or building management platform via a WOODWARD EasyGen communication gateway or a third-party Modbus-to-Ethernet converter, the 9905-028 replacement is an ideal checkpoint to audit the entire data path from the genset controller to the supervisory layer.

For installations that include a WOODWARD EasyGen-3000 or EasyGen-3500 series master controller coordinating multiple generator sets, the 9905-028 load sharing module must be re-commissioned within the paralleling logic after replacement. This process typically involves re-entering droop settings, load sharing gain parameters, and isochronous mode configurations via the WOODWARD service tool or a compatible programming cable connected to the module’s RS-232 or USB service port.

In control cabinets where the 9905-028 is mounted alongside a WOODWARD 2301A or 2301D speed control unit, technicians should verify that the speed reference signal handoff between the load sharing module and the governor actuator remains within calibrated tolerance after the swap. Similarly, if the installation includes a WOODWARD ProAct digital actuator or an EG3P fuel control actuator, the actuator feedback loop should be re-verified post-installation to confirm stable isochronous operation under load.

Power supply integrity is another critical checkpoint. Many legacy genset panels use a dedicated 24 VDC power supply module — often a Phoenix Contact or WAGO rail-mount PSU — to feed the EasyGen controller and associated I/O modules. If the power supply is aging or undersized for the updated module’s inrush current profile, replacement of the PSU in parallel with the 9905-028 is strongly recommended to prevent nuisance resets during engine cranking transients.

Where the genset control cabinet also houses a DEIF AGC-4 or ComAp InteliGen automatic generator controller operating in a hybrid paralleling topology alongside the WOODWARD EasyGen platform, the 9905-028 replacement must be followed by a cross-controller synchronization check to ensure that load sharing signals and frequency references remain consistent across both control domains. Signal isolators or analog input conditioning modules may be required at the interface boundary to prevent ground loop interference.

Finally, for facilities that maintain a digital twin or PLC-based supervisory layer — such as a Siemens S7-300 or Allen-Bradley ControlLogix system reading genset status via Modbus TCP — the replacement of the 9905-028 is an appropriate moment to update the PLC tag database and verify that all mapped registers remain aligned with the new module’s memory map, particularly if the firmware version has changed between the outgoing and incoming units.

Retrofit Guidance FAQ

Q: Is the WOODWARD 9905-028 a direct wiring-compatible replacement for earlier EasyGen load sharing modules?
A: Yes. The 9905-028 uses the same terminal block layout as predecessor EasyGen load sharing variants. No rewiring of the genset control cabinet is required for a standard like-for-like replacement. Verify terminal labeling against the original wiring diagram before energizing.

Q: What communication protocols does the 9905-028 support, and will my existing SCADA integration remain functional?
A: The 9905-028 supports Modbus RTU over RS-485 as the primary field communication protocol. If your SCADA or DCS system communicates with the EasyGen platform via Modbus, the register map should remain compatible. Confirm the baud rate, parity, and station address settings match your existing configuration before going live.

Q: Do I need to re-flash or reconfigure the module after installation?
A: The 9905-028 ships with factory default parameters. You will need to re-enter site-specific settings — including droop percentage, load sharing gain, rated frequency, and voltage reference — using the WOODWARD service tool or the module’s front-panel interface. Retain a backup of your original parameter set before removing the outgoing unit.

Q: Will the module fit in the same physical space as the unit being replaced?
A: Yes. The 9905-028 maintains the same DIN rail mounting footprint and panel cutout dimensions as standard EasyGen series modules. No mechanical modification to the control cabinet is required.

Q: What should I check regarding power supply compatibility?
A: Confirm that your existing 24 VDC rail supply can deliver sufficient current for the 9905-028 under worst-case load conditions, including during engine start transients. If the supply is shared with other I/O modules or communication devices, verify that total current draw remains within the PSU’s rated output.

Q: How do I verify successful installation before returning the genset to service?
A: After parameter entry, perform a no-load test run to verify speed stability and frequency regulation. Then conduct a load acceptance test at 25%, 50%, and 100% rated load to confirm load sharing response and droop behavior. Log all test results for your maintenance records.

Warranty Assurance

Every WOODWARD 9905-028 unit shipped by TOPNLMS is covered by a 12-month warranty from the date of delivery. Prior to dispatch, each module undergoes a pre-shipment functional inspection to verify power-up behavior, communication port integrity, and terminal block condition. Units that do not meet our outgoing quality standard are quarantined and not offered for sale.

In the event of a warranty claim, TOPNLMS provides a replacement unit or full refund depending on the nature of the defect and the elapsed warranty period. Our after-sales response target is 24 hours for initial acknowledgment and 72 hours for resolution proposal. Warranty claims must be accompanied by the original order reference and a brief description of the observed fault.

We ship from Xiamen, China, with DHL Express, FedEx International Priority, and UCP air freight options available depending on destination and urgency. Most orders to Southeast Asia, the Middle East, and Europe are delivered within 3–7 business days. Expedited same-day dispatch is available for orders confirmed before 14:00 CST.

For procurement teams managing critical spare parts inventory, TOPNLMS can provide advance replacement units on a consignment basis for qualified accounts. Contact our sales team to discuss stocking arrangements, volume pricing, and lead time commitments for your facility’s maintenance schedule.

—

© 2026 TOPNLMS. All rights reserved.
Original Source: https://topnlms.com
Contact: [email protected] | +86 18359293191