Instruction Manual
Table Of Contents
- Major Features and Benefits
- Functional Overview
- System Overview
- Application Examples
- Collect Fault Information From Remote Branches
- Improve Fuse Coordination
- Fuse-Blowing Scheme Shortcomings
- Improve Fuse-Blowing Schemes With the Fault Transmitter and Receiver System
- Fuse-Saving Combined With Fuse-Blowing Schemes
- Improve Feeder Cable First-Span Protection
- Implement a Low-Cost Fast Bus-Tripping Scheme
- Tripping the Right Recloser Faster
- Safety Information
- Network Deployment Overview
- Device Installation
- Dimensions
- Specifications
- Appendix A: Manual Versions
- Appendix B: Two-Branch Application
- Appendix C: Link Budget Analysis
- Appendix D: SEL-RP50 Fault Repeater Detailed Implementation
- Technical Support
6
SEL-FT50/SEL-FR12 Fault Transmitter and Receiver System Instruction Manual Date Code 20210405
System Overview
The SEL-FR12 collects wireless signals simultaneously from as many as 12
SEL-FT50 Fault Transmitters (enough for 4 three-phase installations). The
SEL-FR12 reports faults to a relay or recloser control in less than 6 ms via
M
IRRORED BITS. The SEL-FR12 HMI contains 29 LEDs and 1 pushbutton, as
shown in Figure 5.
➤ The ENABLED LED illuminates green when the SEL-FR12 is turned
on and operational. The ENABLED LED flashes when the SEL-FR12 is
in one of the diagnostic modes listed.
➤ The 12 FAULT LEDs (red, one per Unit ID) illuminate after the
SEL-FR12 receives a Fault message from the associated SEL-FT50.
These LEDs have a latching behavior so that once set, they remain on
until reset by the TARGET RESET pushbutton or via M
IRRORED BITS
command.
➤ The 12 LINK LEDs (green, one per Unit ID) have a tristate operation:
➢ LINK LEDs are initially off when the SEL-FR12 is turned on or
after it receives a clear link status command via M
IRRORED BITS.
➢ LINK LEDs illuminate when the SEL-FR12 receives consecutive
Link messages or one Fault message from the associated
SEL-FT50. These LEDs have a delayed dropout behavior. Once
illuminated, they remain illuminated as long as Link signals are
periodically received.
➢ LINK LEDs begin to flash after one minute elapses without
receipt of a Link message for the associated Unit ID. When Link
or Fault signals resume, the LINK LED stops flashing and stays
illuminated once again.
Figure 5 SEL-FR12 Overview
ENABLED
LED
FAULT and LINK
status LEDs
M
IRRORED BITS
status LEDs
TARGET RESET
pushbutton
Serial port
(DB-9 connector)
Power supply
input (9–30 Vdc)
Control (DIP) switches to select:
• Network ID—SW 1–4
• Baud rate—SW 5–6
• M
IRRORED BITS TX and RX ID—SW 7–10
• Near/distant SEL-FT50—SW 11–14
Radio antenna
BNC connector
Grounding lug
NOTE: The ENABLED LED operation
changes during diagnostic modes (see
Receive Signal Strength Indicator on
page 26
and
Read Settings on
page 30
).
NOTE: The SEL-FR12 works
identically with systems that include
SEL-RP50s.