Product Details
The Woodward 9905-860, also cataloged as the 9905-860 Digital Control Unit, operates as a dedicated hardware component for turbine and engine regulation within PEAK150 control platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 9905-860 |
| Brand | Woodward |
| Origin | USA |
| Weight | 1.3 kg |
| Dimensions | 243 x 176 x 86 mm |
| Operating Temp | -40 to 70 deg C |
| Supply Voltage | 18 to 32 VDC |
| Input Signal | 4-20 mA |
| Ingress Protection | NEMA 4 |
Actuator Loop Feedback Response
The 9905-860 provides closed-loop control by processing 4-20 mA input signals to modulate prime mover fuel actuators. The control logic is optimized for rapid response in turbine applications, maintaining stable speed or load setpoints despite external perturbations. The unit supports Modbus communication, allowing for integration into higher-level supervisory networks for parameter monitoring and setpoint adjustments. Proper tuning of the proportional-integral-derivative (PID) parameters is required to achieve the necessary actuator loop feedback response, ensuring the system maintains steady-state operation while minimizing overshoot during transient load changes.
Frequently Asked Questions
Q: Does the NEMA 4 enclosure rating allow for outdoor installation?
A: Yes, the NEMA 4 rating indicates the unit is constructed to provide protection against ingress of solid foreign objects (falling dirt and windblown dust) and ingress of water (rain, sleet, snow, splashing water, and hose-directed water).
Q: Is the Modbus communication protocol supported for configuration?
A: Yes, the 9905-860 supports Modbus protocol, enabling data exchange with external controllers for operational status, fault logging, and remote setpoint adjustment.
Field Installation Guidelines
- Mounting: Ensure the 243 x 176 x 86 mm housing is mounted on a flat, rigid surface. The NEMA 4 rating is contingent upon the use of appropriate conduit fittings and gasket seals during installation.
- Electrical Connections: Supply 18-32 VDC power to the designated terminals. Verify that the power source is isolated from high-voltage transients to protect the digital logic.
- Signal Cabling: Use shielded, twisted-pair cables for the 4-20 mA input signals. Ground the cable shield at the control end only to prevent ground loops.
- Thermal Management: While rated for -40 to 70 deg C, avoid mounting the control in direct sunlight or in proximity to high-heat exhaust components to ensure longevity of the internal display and microprocessor.
- Validation: Perform a functional test of the 4-20 mA input loop and verify Modbus connectivity before applying fuel to the prime mover.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
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