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Overview
The 8440-1868 from Woodward is a microprocessor-controlled Automatic Transfer Switch (ATS) controller engineered to manage reliable power source switching in three-phase electrical systems. The unit supervises and controls transfer operations between utility power, generator sources, or multiple generator sets while maintaining system stability.
Designed for mission-critical installations, this controller supports several transfer strategies—including open, delayed, and closed transitions—combined with phase-synchronization monitoring. These functions enable smooth source transfers while minimizing voltage disturbances, current spikes, and mechanical stress on connected equipment.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | DTSC-200-55B (8440-1868) |
| Manufacturer | Woodward |
| Device Type | Automatic Transfer Switch (ATS) Controller |
| System Compatibility | Three-phase AC power systems |
| Transfer Modes | Open transition, delayed transition, closed transition |
| Synchronization Method | In-phase monitoring with synch-check logic |
| Closed Transition Overlap | Adjustable from <100 ms to continuous paralleling |
| Current Input Rating | 5 A CT input |
| Control Architecture | Microprocessor-based digital controller |
| Programmable Functions | Source selection, transfer inhibit, load shed/restore |
| Test Functions | Engine test sequences and operational diagnostics |
| Auxiliary Control | Elevator pre-signal capability |
| Protection & Monitoring | Voltage and phase monitoring for both sources |
| Installation Type | Panel-mounted ATS control interface |
| Typical System Voltage | Configurable depending on ATS system design |
Key Functional Capabilities
Multi-Mode Transfer Control
Supports three transfer strategies to suit different electrical system requirements. Open transition ensures safe break-before-make operation, while closed transition allows seamless source changeover with minimal interruption.
In-Phase Synchronization Monitoring
Built-in synch-check logic verifies voltage, frequency, and phase alignment before initiating closed transition transfers, reducing electrical stress and transient disturbances.
Adjustable Closed-Transition Timing
Overlap timing can be configured from momentary transfers (<100 ms) to extended parallel operation, supporting complex power management strategies.
Programmable Load Management
Integrated load shedding and restoration logic allows staged reconnection of loads following generator startup or power restoration.
Flexible System Integration
Customizable inputs and outputs support features such as transfer inhibit commands, external source selection, elevator pre-signal control, and scheduled generator testing.
Typical Application Scenarios
The DTSC-200-55B controller is commonly implemented in critical power systems where uninterrupted operation is required:
- Data centers and telecommunications infrastructure
- Hospitals and medical facilities
- Industrial manufacturing plants
- Commercial buildings and high-rise complexes
- Marine and offshore power systems
- Utility backup generator installations
Operational Considerations
Correct configuration and commissioning are essential to ensure reliable transfer operation. The controller must be matched with the appropriate ATS hardware, voltage sensing configuration, and current transformer ratings. Routine functional testing is recommended to confirm transfer logic and protection responses.
FAQ
What type of transfer systems can the DTSC-200-55B manage?
The controller is designed for three-phase ATS installations and can control transfers between utility power, generator sets, or multiple generator sources.
Does the controller support closed transition transfers?
Yes. The controller includes synch-check logic and adjustable overlap timing to enable safe make-before-break transfers.
Can the controller perform generator test routines?
Built-in engine test programs allow scheduled generator testing without disrupting facility power.
