Description
Application Scenarios
A hospital campus in a coastal region faced recurring power quality issues from its utility feed, with voltage sags and frequency deviations threatening critical care equipment. The facility’s existing ATS controller lacked advanced monitoring capabilities, resulting in delayed transfers during grid disturbances and occasional failed transfers when the backup generator wasn’t ready. After installing the DTSC-200-55B, the facility gained comprehensive source monitoring with adjustable voltage and frequency thresholds, enabling preemptive transfers before power quality degraded below acceptable limits. The controller’s closed-transition capability with in-phase monitoring ensured transfers completed in under 100ms, preventing even momentary interruptions to life-support systems. The DTSC-200-55B transformed the hospital’s emergency power system from a reactive backup to a proactive power quality management solution.
Parameter
| Parameter | Value/Description |
|---|---|
| Product Model | DTSC-200-55B |
| Manufacturer | Woodward |
| Product Category | Automatic Transfer Switch Controller |
| Part Number | 8440-1779 |
| Supply Voltage | 12/24 Vdc (6.5 to 40.0 Vdc) |
| Power Consumption | Max. 8 W (3 W in power save mode) |
| Voltage Measurement | FlexRange™: 69/120 Vac and 277/480 Vac ranges |
| Current Measurement | 5 A nominal (via CT) |
| Frequency Range | 50/60 Hz (40 to 70 Hz) |
| Discrete Inputs | 12 configurable, 12/24 Vdc isolated |
| Relay Outputs | 8 discrete outputs (LogicsManager™ programmable) |
| Communication | RS-485 Modbus RTU Slave, CANopen (isolated) |
| Display | 128×64 pixel graphic LCD with softkeys |
| Operating Temperature | -20 to 60 °C |
| Dimensions | 219 × 171 × 61 mm |
| Weight | Approx. 800 g |
| Certifications | CE, UL/cUL Listed |
Technical Principles and Innovative Values
Innovation Point 1: FlexApp™ Technology for Multi-Application Flexibility. The DTSC-200-55B eliminates the need for application-specific controller variants through FlexApp™ technology, which allows a single unit to be configured for Utility-to-Generator, Generator-to-Generator, or Utility-to-Utility systems. This design reduces inventory requirements for panel builders and maintenance teams, who can stock one controller model and configure it to match any project requirement. The technology also simplifies retrofits, as existing wiring infrastructure can be repurposed regardless of the original ATS topology.
Innovation Point 2: LogicsManager™ Eliminates External PLCs. The DTSC-200-55B incorporates Woodward’s LogicsManager™ programmable logic engine, which enables users to create custom control sequences using Boolean operators, timers, and measurement values without external relay logic or PLC hardware. For example, a facility can program the controller to inhibit transfers during specific load conditions, activate load shedding when generator capacity is constrained, or implement source priority schemes based on operational schedules. This built-in logic capability reduces panel complexity, wiring, and potential failure points.
Innovation Point 3: FlexRange™ True RMS Measurement. The DTSC-200-55B provides true RMS voltage measurement with separate inputs for 120 Vac and 480 Vac ranges within a single unit, accommodating both low-voltage control circuits and medium-voltage distribution systems without external potential transformers for the control interface. True RMS sensing ensures accurate measurement even with distorted waveforms from nonlinear loads, which is critical for facilities with variable frequency drives, UPS systems, and other power electronics.
Innovation Point 4: Comprehensive Protection and Monitoring Suite. The controller integrates ANSI-standard protection functions including over/under voltage (59/27), over/under frequency (81O/U), voltage imbalance (47), overcurrent (50/51), and phase rotation monitoring. The synch-check function (ANSI 25) with in-phase monitoring ensures transfers only occur when sourc
