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The PDI TFA Static Transfer Switch ensures maximum power availability and reliability for mission-critical loads by seamlessly transferring between two independent power inputs. Available in sizes from 250A to 1200A, it features patented transfer algorithms, a 2 million hour mean time between failure (MTBF), dual redundant operator interfaces, flash memory firmware updates and hot-swappable control logic components. Its innovative true front access enclosure allows for easy installation, service, maintenance and IR scanning from the front.
Adaptable for both primary (480V) and secondary (208V) topologies, the PDI TFA STS simplifies installation with a common power and controls pass-through. It monitors power quality in real-time and enhances worker safety with compartmentalized sections to reduce arc flash risk. The adaptable entry/exit options for power and communications make it suitable for various mission-critical facilities, ultimately achieving the lowest total cost of ownership.
| Ratings | |
| Current | 250A, 400A, 600A, 800A, 1000A, 1200A |
| Redundancy | • Fail safe dual redundant display • Triple redundant logic • Triple redundant power supplies • Dual redundant gate drivers for SCRs. Two gate drivers for each SCR • Two-output switches available |
| Logic | • Power or gate (POG) algorithm • Volt second synchronization (VSS) algorithm limits in-rush for 600, 575, 480, 450, 415, 400, 380 & 208 volt systems during transfers. • VSS soft start up, initial start-up, restart or transfer limits to ≤2 times in-rush up to 180 degrees out of phase, typically <1 times in-rush. |
| Security | • Layered security through log on access • User log-on ID and PIN number required for PDI STS operation • All log-ins are time and date stamped for future reference |
| Installation and maintenance | • True front access enclosure for installation, maintenance, service and IR scanning. • Separate compartments for logic module, power semiconductors, molded case switches and fans for safer maintenance and easy access for IR scanning. • Optional IR scanning windows enable operator to scan all connections with minimal personal protective equipment (PPE). • Hot swap capability for printed circuit boards (PCBs) • Bypass allows for replacement of PCBs while STS is powered and connected to the load. • Hot swap capability for touch screen display. • Engaging the redundant operator interface (ROI) allows the touch screen display to be replaced without interrupting power. • Landing power and communications cables has never been easier with both top/bottom entry/exit within the true front access enclosure. |
| Monitoring | • Fail safe dual redundant operator interfaces • Primary interface – touch screen display • Secondary interface – redundant operator interface (ROI) • Status, event and alarm logs captured and stored at the PDI STS and viewable locally on the touch screen display and via web browser (PDI STS may NOT be operated via the web browser). • Events will continue to record up to 10 seconds after loss of power. • Event/alarm memory is 2MB • Real-time capture of wave forms • Branch circuit monitoring system (BCMS) available • Graphic depiction of load trends • Graphic depiction of voltage and current harmonics • Voice unit audible assistance for alarms and bypass operations. |
| Graphical user interface (GUI) | • 10.4-inch LCD color touch screen • 640 x 480 resolution • 262k colors |
| Communications protocol | • Modbus TCP/IP • Modbus RTU through RS 422/485 port • SNMP • (TCP/IP) read-only web browser • Email alerts • NTP time setting • Alarm log download via USB |
