Description
Product Introduction & Engineering Value
The 3522-1005 is not a generic PLC or digital I/O module. It belongs to Woodward’s EM-80/EM-300 all-electric actuator system. The system uses a three-phase brushless AC motor driving a precision planetary gearbox, with a dedicated driver controlling actuator position and providing monitoring and diagnostic functions.
The EM actuator platform was designed for prime movers where a mechanical drive or hydraulic oil supply is unavailable or undesirable. Typical duties include positioning engine fuel racks, turbine fuel valves, turbine/turbocharger variable geometry, and timing mechanisms.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 3522-1005 |
| Manufacturer | Woodward |
| System | EM-80 / EM-300 Actuator System |
| Driver Type | EM actuator driver |
| Configured Actuator | EM-80 |
| Rotation Direction | Clockwise (CW), per Woodward retrofit documentation |
| Actuator Output Rotation | 40° |
| Motor Type | Three-phase brushless AC |
| Transmission | Planetary reduction gearbox |
| Output Interface | ISO 9409 actuator flange |
| Position Feedback | Dedicated actuator position-sensor arrangement |
| Control Architecture | Dedicated electronic driver |
| Configuration | PC/Windows-based setup supported by the EM system |
| Monitoring | Driver-based monitoring, alarms, and diagnostics |
| Typical Application | Fuel rack / fuel valve / variable geometry / timing control |
The 40° actuator travel, brushless AC motor, planetary gearbox, ISO 9409 flange, position indicator, and dedicated driver architecture are documented for the EM-80/EM-300 system.
Important specification note
Some aftermarket listings incorrectly describe 3522-1005 itself as an actuator, while Woodward documentation distinguishes the driver from the actuator. The Woodward retrofit document is particularly useful here: it explicitly lists 3522-1005 under the existing EM-80/EM-300 driver part numbers.
Therefore, for procurement purposes, treat 3522-1005 as the driver unless the equipment nameplate and assembly documentation establish otherwise.
System Architecture
The practical arrangement is:
Control system → EM driver → three-phase actuator motor → planetary gearbox → mechanical output
The actuator provides the physical rotary movement, while the driver supplies the electronic control and monitoring functions.
The EM-80/EM-300 system incorporates an actuator, dedicated driver, position-sensor wiring, mounting hardware, and associated electrical filtering. Woodward documentation states that a single EM driver can be used for both EM-80 and EM-300 systems, with the software configuration determining the applicable actuator type.
This distinction matters during a field replacement. Replacing only the driver does not automatically mean the machine is correctly configured.
3522-1005
3522-1005
Field Applications
Gas and Diesel Engine Fuel Control
The EM-80 system can position an engine fuel rack where precise mechanical positioning is required. This is particularly relevant to large stationary engines and generator packages.
Turbine Fuel-Valve Control
The system can control turbine fuel valves and other final-control mechanisms where actuator position directly affects prime-mover output.
Variable Geometry
Turbine and turbocharger variable-geometry mechanisms are another documented application. The actuator’s controlled rotary travel can be mechanically coupled to the required vane or linkage movement.
Timing Mechanisms
The EM system is also intended for timing-control duties on engines and turbines, particularly where conventional mechanical actuation is impractical.
The Field-Service Issue That Matters
A common mistake is to treat the four-digit/four-digit Woodward number as if it were only a catalog identifier.
It is not.
Woodward’s retrofit documentation specifically distinguishes:
- 3522-1004 — EM-300, CCW
- 3522-1005 — EM-80, CW
- 3522-1009 — EM-80, CW
The same documentation also warns that the actual actuator rotation direction must be verified at the installation because the rotation requirement can vary by application.
Replacement procedure should therefore begin with:
- Record the complete driver part number.
- Record actuator model.
- Record rotation direction.
- Record existing configuration parameters.
- Verify actuator feedback wiring.
- Confirm the mechanical linkage position.
- Verify minimum and maximum travel before returning the prime mover to service.
QA & Testing SOP
For New Surplus, surplus, or refurbished 3522-1005 stock, a useful receiving inspection should include:
Visual Inspection
- Confirm the Woodward nameplate.
- Verify 3522-1005 rather than a visually similar 3522-10XX unit.
- Inspect connectors, terminal areas, housing, and mounting hardware.
- Look for evidence of moisture ingress, impact, corrosion, or unauthorized repair.
Electrical Inspection
- Check connector and terminal integrity.
- Verify insulation and grounding conditions where applicable.
- Inspect wiring interfaces against the EM-80 system documentation.
Functional Verification
A proper bench test should be performed using the appropriate Woodward test environment rather than applying power to an unknown driver and assuming normal operation.
Configuration Verification
Before installation, compare the replacement driver’s configuration against the removed unit.
This is particularly important because the EM-80/EM-300 driver family uses configuration parameters associated with actuator type and rotation. Woodward’s retrofit procedure explicitly requires configuration and rotation settings to be checked.
Veteran’s Tech Trap Guide
Trap 1 — Confusing 3522-1005 with 3522-1004
These are not interchangeable simply because they belong to the same EM driver family.
Woodward identifies 3522-1004 as an EM-300, CCW driver and 3522-1005 as an EM-80, CW driver.
PRO TIP: Match the actuator and rotation configuration before matching the physical mounting dimensions.
Trap 2 — Treating the driver as the actuator
The EM-80 system contains separate driver and actuator functions. The actuator uses a brushless AC motor and planetary gearbox, while the driver controls the actuator.
PRO TIP: When requesting a replacement, specify whether you need the driver, the actuator, or the complete EM-80 assembly.
Trap 3 — Ignoring rotation direction
CW/CCW is not a cosmetic configuration.
Woodward’s retrofit procedure explicitly instructs technicians to verify the actual actuator rotation direction and determine it from minimum-to-maximum fuel movement.
PRO TIP: Photograph and document the original parameter configuration before removing the failed driver.
Trap 4 — Assuming a newer replacement is a direct plug-in
Woodward’s official manual identifies 3522-1005 as an older EM-80/EM-300 driver and documents retrofit procedures for replacing older models such as 3522-1005 with newer hardware.
That means a newer replacement may require a defined retrofit/configuration procedure rather than a simple remove-and-replace operation.
Procurement & Compatibility Checklist
Before issuing a purchase order for Woodward 3522-1005, confirm:
- Exact P/N: 3522-1005
- Manufacturer: Woodward
- EM system identification
- EM-80 actuator compatibility
- CW rotation requirement
- Existing driver configuration
- Connector and cable condition
- Actuator feedback arrangement
- Mechanical linkage position
- New Surplus / refurbished / used condition
- Serial number and nameplate photographs
- Test report availability
- Warranty period
- Replacement/retrofit documentation
For critical turbine or engine service, the complete nameplate photograph is worth more than a generic statement that the part is “compatible.”
FAQ
Is Woodward 3522-1005 an actuator?
It is best identified as an EM-80 actuator driver. Woodward’s retrofit documentation specifically lists 3522-1005 as an existing EM-80/EM-300 driver model.
What actuator is associated with 3522-1005?
The documented configuration is the Woodward EM-80, with clockwise rotation identified in Woodward’s retrofit documentation.
Is 3522-1005 interchangeable with 3522-1004?
Do not assume so. Woodward identifies 3522-1004 as an EM-300 CCW driver and 3522-1005 as an EM-80 CW driver.
Is 3522-1005 still suitable for legacy equipment?
It can be relevant for maintaining legacy EM-80 installations, but lifecycle status and replacement strategy should be evaluated against the specific installation. Woodward’s documentation already describes retrofit paths from older driver models, including 3522-1005, to newer hardware.
Can a New Surplus 3522-1005 be used as a spare?
Potentially, provided the part number, configuration, actuator compatibility, rotation direction, connectors, and condition are verified. New Surplus should not be equated with electrically tested.
What should be supplied with a replacement unit?
At minimum, request the exact part number, nameplate/serial information, condition declaration, configuration information where available, test evidence, and warranty terms.
Engineering Bottom Line
Woodward 3522-1005 is a legacy EM-80 actuator driver, specifically documented as the CW driver configuration in the EM-80/EM-300 family. The key replacement risks are not simply voltage or connector compatibility; they are actuator family, rotation direction, configuration, feedback wiring, and mechanical linkage setup.
For a critical engine or turbine spare, the correct procurement approach is exact part-number matching plus configuration verification, rather than relying on a generic “equivalent” description.
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