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Key Technical Specifications
- Supply Voltage: 12/24 VDC nominal; 8–40 VDC operating range
- Intrinsic Consumption: Maximum 17 W for standard easYgen-3500 configurations
- Current Inputs: 5 A nominal CT inputs; 1 A versions use different part numbers
- Current Setting Range: 1–32,000 A, dependent on programmed CT ratio
- Current Input Burden: Less than 0.15 VA
- Voltage Measuring Range: Dependent on voltage-input configuration; common ratings include 69/120 VAC and 277/480 VAC
- Voltage Accuracy: Class 1
- Operating Temperature: −20 to +70 °C
- Storage Temperature: −30 to +80 °C
- Humidity: Up to 95%, non-condensing
- Control Modes: Island operation, mains-parallel operation, synchronization, and reactive-power regulation
- Measuring Systems: 3-phase 3-wire, 3-phase 4-wire, and single-phase arrangements
- Discrete Inputs: Isolated 12/24 VDC inputs; approximately 20 kΩ input resistance
- Relay Outputs: Isolated outputs; contact ratings depend on load category and circuit configuration
- Communications: CAN, RS-232, and RS-485 interfaces, depending on configuration
- Protection Rating: Front and rear ratings depend on mounting arrangement and enclosure configuration
- Part Number Warning: Standard 5 A P1 version is commonly listed as 8440-1934; P2 version as 8440-1936
The suffix and package are critical. Woodward lists separate P1, P2, marine, rental, K32, and 1 A/5 A variants. Do not substitute a 1 A model for a 5 A CT installation without redesigning the measurement circuit. cite
Product Introduction
The Woodward easYgen-3500-5 is a 5 A current-transformer-input genset controller for generator protection, engine control, synchronization, islanded operation, and mains-parallel operation. It is used on diesel and gas generator sets where the controller must measure generator electrical quantities and control breaker or load-sharing functions.
This model is selected for installations requiring reactive-power regulation and utility-parallel control rather than basic start/stop operation. Confirm whether the required unit is P1, P2, marine, rental, or another package before ordering; the package changes the available I/O, functions, approvals, and part number. cite
easYgen-3500-5
easYgen-3500-5
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to This Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No display or status indication | Missing DC supply, open fuse, reversed polarity, or internal power fault | ⚠️ Medium | Measure 8–40 VDC directly at the controller supply terminals during startup | Check battery disconnects, fuses, cable voltage drop, and ground return before replacing the controller |
| Controller resets during engine cranking | Battery voltage collapse or starter noise | ❌ Low | Monitor controller supply voltage while cranking; inspect the battery and engine ground straps | Correct the DC system first; repeated resets do not automatically indicate a failed controller |
| Generator voltage reads zero | Open PT/sensing fuse, wrong terminal wiring, or incorrect voltage configuration | ❌ Low | Measure phase-to-phase and phase-to-neutral voltage at the controller input terminals | Repair the sensing circuit and verify the programmed measurement system |
| Generator current is incorrect on all phases | Wrong CT ratio or 1 A/5 A mismatch | ✅ High | Confirm the nameplate CT secondary rating, controller model, programmed ratio, and measured secondary current | A 5 A model requires the correct 5 A CT circuit; do not connect a 1 A CT directly without verification |
| One phase shows reversed or negative power | CT polarity or phase assignment error | ❌ Low | Compare CT S1/S2 orientation and phase voltage-to-current pairing | Correct CT polarity and phase mapping before replacing hardware |
| Generator breaker will not close | Synchronization limits, breaker interlock, or missing auxiliary feedback | ❌ Low | Check voltage, frequency, phase angle, close command, and breaker feedback status in diagnostics | Verify synchronizing parameters and interlock wiring before condemning the controller |
| Mains-parallel operation fails | Incorrect mains sensing, phase rotation, utility mode, or breaker logic | ⚠️ Medium | Confirm mains voltage and phase sequence at the designated inputs; review operating mode and alarms | Validate the configuration against the single-line diagram and utility protection scheme |
| Reactive power or power factor control is unstable | Incorrect CT polarity, voltage phase mapping, droop settings, or regulator tuning | ⚠️ Medium | Compare measured kW, kvar, and power factor against a calibrated portable meter | Correct measurement mapping and tuning; do not replace the controller based on unstable regulation alone |
| Engine does not start | Start relay circuit, fuel solenoid, emergency stop, or external permissive fault | ❌ Low | Check start-output status, relay contact voltage, emergency-stop chain, and active alarms | Trace the start circuit from the controller output to the engine actuator |
| CAN or RS-485 communication is lost | Wiring polarity, termination, node address, baud rate, or firmware mismatch | ⚠️ Medium | Check cable continuity, termination resistance, node settings, and network diagnostics | Correct the physical layer and configuration before replacing the controller |
| Digital input never changes state | Missing 12/24 VDC signal, incorrect common, or field wiring fault | ❌ Low | Apply a verified control voltage at the input terminal and observe the diagnostic status | Test the input at the controller terminal to separate field wiring from internal input failure |
| Parameters do not match after replacement | Wrong package, incompatible configuration file, or unsaved settings | ✅ High | Compare firmware, package, option codes, CT ratio, voltage setup, and I/O mapping | Back up the original configuration and manually verify every protection and control parameter |
The most common field errors on this controller involve CT polarity, CT secondary rating, phase assignment, and breaker feedback—not a failed CPU. Disable automatic starting and isolate the generator before testing live control circuits. If the diagnosis remains uncertain, provide technical support with the complete nameplate, package suffix, firmware revision, alarm list, configuration file, terminal photographs, and diagnostic logs.
Frequently Asked Questions (FAQ)
What is the Woodward easYgen-3500-5 used for?
It controls and protects generator sets operating in islanded or utility-parallel applications. Functions can include engine start/stop, generator measurement, synchronization, breaker control, active and reactive power regulation, alarms, and protection.
What does the “-5” designation mean?
The “-5” identifies the 5 A current-input version. Woodward also lists 1 A versions with different part numbers. Confirm the CT secondary rating before ordering; a 5 A and 1 A controller are not interchangeable by model name alone. cite
What is the difference between P1 and P2?
P1 and P2 are different hardware or feature packages within the easYgen-3500 family. They may differ in I/O, available control functions, communication features, approvals, and configuration requirements. Match the old unit’s complete part number and package marking instead of ordering only “easYGEN-3500-5.”
Can I replace an older easYgen-3500-5 with any newer 3500 controller?
No. Verify the 1 A or 5 A input type, P1/P2 package, terminal assignments, mounting arrangement, firmware compatibility, configuration-file format, and required communications. Also compare generator and mains voltage-sensing circuits before installation.
Can I hot-swap the controller?
Do not hot-swap it unless the exact Woodward installation documentation explicitly permits that procedure. Disable remote start, isolate the DC supply, secure the generator breaker, and verify that the engine cannot crank while the controller is disconnected.
Will my generator settings transfer automatically?
Not necessarily. Back up the original configuration and record CT ratio, voltage ratio, nominal frequency, phase sequence, protection limits, start delays, breaker logic, CAN settings, and power-control parameters. After installation, compare every value because a wrong CT ratio can produce unsafe power and protection calculations.
Why is a surplus easYgen-3500-5 cheaper than a factory-supplied unit?
The unit may be unused OEM inventory, discontinued stock, project surplus, or a tested used controller. Price alone does not establish condition. The seller should state whether it is factory sealed, new surplus, refurbished, or used, and should provide the nameplate, serial number, package suffix, firmware revision, warranty terms, and test evidence.
Which part numbers are associated with this model?
Woodward documentation commonly lists 8440-1934 for the easYgen-3500-5/P1 and 8440-1936 for the easYgen-3500-5/P2. Other variants include K32, marine, rental, and revised product families. Verify the exact number printed on the installed controller before purchasing a replacement.
