Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | DTSC-200-55B |
| Part Number | 8440-1779 |
| Manufacturer | Woodward |
| Product Type | Digital Transfer Switch Controller (ATS) |
| Supply Voltage | 12/24 VDC (6.5 to 40.0 VDC operating range) |
| Current Measurement | ../5 A (5A CT input) |
| Voltage Measurement | 120 VAC (max. 150 VAC) and 480 VAC (max. 600 VAC) dual range |
| Frequency Range | 50/60 Hz (40 to 70 Hz measuring range) |
| Display | 128×64 pixel graphic LCD with softkeys |
| Discrete Inputs | 12 configurable isolated inputs |
| Discrete Outputs | 9 programmable relay outputs |
| Communication | CANopen, RS-485 Modbus RTU Slave |
| Operating Temperature | -20°C to +60°C |
| Storage Temperature | -30°C to +80°C |
| Dimensions (W×H×D) | 219 × 171 × 61 mm |
| Panel Cutout | 186 × 138 mm |
| Weight | Approximately 800 g |
| Certifications | CE marked, UL/cUL Listed |
Main Features and Advantages
Complete Transfer Mode Flexibility: The Woodward DTSC-200-55B supports open (break-before-make), delayed transition with timed neutral position, and closed transition (make-before-break) transfers in less than 100 milliseconds . In-phase monitoring (synch-check) ensures safe transfers across all transition types, reducing risks during source switching. Extended parallel time can be configured for soft loading applications where prolonged paralleling is required.
Programmable Logic Without External Hardware: LogicsManager™ provides programmable Boolean logic functions that eliminate the need for external relay logic or separate PLCs. The Woodward DTSC-200-55B executes complex transfer schemes through its internal logic engine, reducing system complexity, wiring requirements, and associated costs . With 12 configurable discrete inputs and 9 programmable relay outputs, the controller accommodates extensive customization.
Advanced Source and Load Monitoring: The Woodward DTSC-200-55B continuously monitors both power sources for over/under voltage (ANSI 59/27), over/under frequency (ANSI 81O/U), voltage imbalance, and phase rotation . Load monitoring includes overcurrent (ANSI 50/51) and overload protection. Switch monitoring features position feedback verification, transfer failure detection, and battery voltage supervision, ensuring comprehensive system awareness.
Critical Application Safety Features: Transfer and retransfer inhibit functions prevent unwanted switching during unstable source conditions. The elevator pre-signal provides a configurable timed warning before power transfers, enhancing building safety . Motor load disconnect signals protect sensitive equipment by disconnecting motor loads during transitions. Load shed and restore capabilities prioritize critical loads during power shortages.
Expandable I/O and Communication: The Woodward DTSC-200-55B offers an isolated CANopen port supporting up to two Woodward IKD-1 expansion modules, adding as many as 16 additional discrete inputs and outputs . The RS-485 Modbus RTU Slave interface enables SCADA integration and remote annunciation. Remote control is possible via RS-485, CAN, or discrete input signals. The event recorder with real-time clock maintains 300 FIFO entries for diagnostics and troubleshooting.
