Equipment Capability & Market Application

The SPM-D2-1010B/X (8440-2168), part of the Woodward SPM-D2 series, is a microprocessor-based synchronizer designed for three-phase AC generators equipped with Woodward or other compatible speed controls and automatic voltage regulators. In mission-critical power environments such as hospital backup systems, remote mining microgrids, and continuous-process chemical plants, the 8440-2168 provides essential synchronization and dead-bus start functionality. By precisely matching frequency, phase, and voltage before breaker closure, this controller eliminates the catastrophic mechanical stress and electrical surges associated with poor synchronization. Its ability to manage isolated operations ensures that your power generation assets remain stable even during primary grid failures, significantly reducing the risk of equipment damage and unscheduled downtime.

Control Logic & Technical Configuration

The 8440-2168 SPM-D2-1010B/X is engineered for high-precision 2-phase sensing and synchronization. The unit integrates both control and monitoring functions into a compact, flush-mount housing.

• Synchronization Performance: Supports 2-phase synchronization and measuring for both the generator (System A) and the busbar (System B), ensuring high accuracy in phase matching.

• Flexible Control Bias: Features analog bias outputs that are freely configurable for a vast range of signals including +/- 1 V, +/- 3 V, +/- 10 V, and 0 to 20 mA. It also supports 500 Hz PWM output for speed control.

• Dead Bus Management: Includes "On Demand" dead bus start functionality, allowing for safe breaker closure when the busbar is unpowered.

• Interface Options: Equipped with a front-facing USB serial interface for rapid field configuration using the Woodward ToolKit software.

Technical Specifications

Operations & Maintenance FAQ

How do I configure the analog outputs for different AVR types?

The analog outputs are freely configurable via the Woodward ToolKit software. You can select between voltage bias (+/- 10 V) or current bias (+/- 20 mA) to match the requirements of your specific Automatic Voltage Regulator (AVR) or Governor.

Does the 8440-2168 support synchronization if the busbar is dead?

Yes. The unit features "Dead Bus Start" functionality. When the controller detects a dead bus condition, it can be commanded to close the breaker immediately to energize the system, bypassing the standard synchronization check.

What is the significance of the 1010B/X designation?

This specific version indicates the hardware configuration for 2-phase sensing, discrete raise/lower capability for both speed and voltage, and specific analog output sets designed for versatile engine-generator sets.

Engineering & Installation Guide

• Sealing and Environmental Protection: The standard front panel rating is IP42. For installations in humid or dusty environments (common in mining and outdoor enclosures), always install the optional gasket (P/N 8923-1037) to upgrade the front seal to IP54. Ensure the mounting clamps are tightened evenly to maintain the seal integrity.

• Signal Shielding: Analog bias outputs for speed and voltage are sensitive to electromagnetic interference. Always use high-quality shielded twisted-pair cabling for these runs. Ensure the shield is grounded only at the controller end to prevent ground loops that could induce frequency jitter in the governor.

• Dead Bus Safety: When commissioning the dead bus start functionality, verify that the sensing transformers for both the generator and the busbar are phased correctly. Incorrect phasing during a transition from dead bus to live bus can result in severe out-of-phase synchronization if the bus becomes energized during the closing sequence.