Woodward 8525-971 Electronic Control Module

Product Description

Configured for actuator loop regulation in governor and drive networks, the Woodward 8525-971 (8525-971 electronic control module) provides direct physical/electrical execution of speed and load control routines. The module processes speed, temperature, and pressure sensor inputs and drives output states across CAN, Modbus, and Ethernet links.

Hardware Specifications

Actuator Loop Feedback Response

The 8525-971 executes V/Hz and field-oriented vector control routines through its actuator loop. Feedback response is closed on the speed input channel with a sampling interval dictated by the selected CAN baud rate. The module holds last-state output during communication timeout instead of forcing zero position, thereby preserving mechanical stability on turbine and compressor shafts. Thermal heat sink dissipation follows the 2.5 W power draw profile; no forced air cooling is required within the -40 deg C to +70 deg C envelope.

Frequently Asked Questions

Q: Does the 8525-971 support hot-swap on the 12 to 32 V DC supply rail?

A: No. Panel power must be removed before connector disengagement. Live insertion causes transient current spike on the input filter and may corrupt the logged operational data block.

Q: What is the maximum CAN bus length when daisy-chaining this module with Woodward 505/505E governors?

A: At 500 kbps CAN, keep total bus length under 50 m with 120 ohm termination at both ends. Beyond this, acknowledge latency on the actuator loop exceeds the speed-control window.

Q: Can firmware be flashed over Ethernet without stopping the controlled machine?

A: No. Firmware update requires the actuator output to be parked in manual mode and the 32 V DC supply cycled. Flash routine takes roughly 90 s and overwrites the data log sector.

Field Installation Guidelines

Mount the module on a flat steel panel using M4 screws at the four corner bosses. Torque to 1.2 Nm. Keep 25 mm clearance above and below the heat sink fins for convection. Route sensor cables (speed, RTD, 4-20 mA pressure) in separate tray from CAN/Modbus/Ethernet runs; cross only at 90 deg. Shield braid on sensor cables terminates to panel ground at the module end only, not at the transmitter end. For Ethernet, use CAT5e shielded cable with drain wire bonded to the same panel ground point. Set DIP switches for node address before applying 12 to 32 V DC. Verify gap voltage on speed input reads within probe supplier tolerance before closing the control loop.

Other Attributes

• Country of Origin:  USA
• Lead Time: In Stock, 2 Working Days
  

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