How to troubleshoot a Woodward 8406-120 that does not power up?
If your Woodward Control Unit does not power up, first check the input power supply on terminals 1 and 2, ensuring it's between 9 to 32 Vdc. Also, verify that the polarity of the power supply to the unit is correct, as reversed polarity can prevent it from powering on.
Why voltages displayed by Woodward 8406-120 Control Unit are different than measured?
If the voltages or currents displayed by your Woodward Control Unit are different from the measured parameter, it might be due to inaccurate calibration of the PT inputs. Calibrate the appropriate PT input channel(s) to resolve this issue.
What to do if Woodward Control Unit cycles on and off when cranking?
If your Woodward Control Unit powers up but then cycles on and off when cranking, this could be due to a weak engine battery, or the engine battery voltage dropping below 6 Vdc during cranking. Try charging or replacing the engine battery.
Why generator voltages are very small on Woodward Control Unit?
If the displayed generator voltages are very small on your Woodward Control Unit, the issue might stem from faulty wiring of the generator Potential Transformers (PTs). In this case, verify the wiring of generator Potential Transformers (PTs). Another potential cause is that the generator PT inputs are improperly calibrated.
What to do if I/O STATUS shows relay is energized but alarm does not occur on Woodward Control Unit?
If the I/O STATUS screen on your Woodward Control Unit shows a relay is energized, but the corresponding action (like an alarm) does not occur, the problem is likely due to faulty wiring of the relay output contacts. Verify the wiring of the relay output contacts to ensure they are correctly connected.
How to fix discrete inputs not showing active on Woodward 8406-120?
If discrete inputs don’t show active in the I/O STATUS screen when switches are activated on your Woodward Control Unit, it could be caused by faulty wiring of the discrete input switches. Verify the wiring of these switches.
Why generator voltage fluctuates on Woodward Control Unit?
If the generator voltage fluctuates or is unstable at no load on the generator with your Woodward Control Unit, the AVR dynamics might be improperly set up. You should tune the AVR dynamics for stable operation.
General| Category | Control Unit |
|---|---|
| Manufacturer | Woodward |
| Model | 8406-120 |
| Number of Digital Outputs | 8 |
| Number of Analog Inputs | 4 |
| Input Voltage Range | 18-32 VDC |
| Operating Temperature Range | -40°C to +70°C |
| Communication Protocol | Modbus RTU, CAN |
Highlights critical safety warnings regarding overspeed, PPE, startup, and automotive applications.
Explains the dual LCD screens, backlight behavior, and keypad layout for status and configuration.
Describes using "CageClamp" terminal blocks for inputs/outputs and wire stripping requirements.
Explains the need for Protective Earth (PE) connection and recommended grounding practices for safety.
Specifies EGCP-2 voltage range (9-32 Vdc) and power consumption, noting inrush current.
Details communication port specifications for RS-485 and RS-422 networks, including computer requirements.
Configures generator protection functions with alarm set points for warning, visual, audible, soft, and hard shutdown.
Details security code requirements and five access levels for configuration menus.
Lists available configuration menus for setting up, calibrating, and adjusting EGCP-2 operation.
Configures generator protection functions with alarm set points for warning, visual, audible, soft, and hard shutdown.
Outlines programmable auto start on loss of mains, crank settings, and idle/rated relay.
Lists engine protection parameters including oil pressure, water temperature, and battery voltage limits.
Covers VAR/PF control in mains parallel, load sharing, and manual voltage control.
Explains synchronizing modes (Run, Check, Permissive), voltage matching, and dead bus closing.
Details calibration of three-phase generator voltage and current inputs for accurate readings.
Explains the calibration of the speed bias offset for biasing governor speed in synchronization.
Guides on configuring set points, verifying wiring, and checking power supply before unit startup.
Provides a step-by-step checklist for initial setup, including set points, discrete inputs, and engine checks.
Warns about incorrect CT/PT phasing and instructs to check phasing if load rises rapidly.
Addresses problems related to unit power, discrete inputs, displayed voltages, and relay outputs.
Covers issues like start command failure, starter motor engagement, unstable engine speed, and power loss.
Troubleshoots phase matching, synchronizer calibration, voltage matching, and dead bus closing issues.
Addresses problems with breaker/contactor closing, dwell time, and C.B. control set points.
Covers issues with negative kW readings, improper load sharing, unstable control, and fast/slow loading.
Addresses phase power factor disagreement, improper reactive load sharing, and unstable VAR/PF.
Troubleshoots issues with units not showing in sequencing, active alarms, network connection, and timing set points.
Covers problems with response to loss of mains and recognition of mains in-spec conditions.
Addresses issues with RS-485 network termination, connection, polarity, and +5Vdc power supply.
Details protective functions like over/under voltage, frequency, overcurrent, and loss of excitation.
Covers proportional load sharing, base load, process control, load ramping, and droop.
Describes how units are sequenced on/off load based on priority, system load, and time delays.
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