A.6
SEL-551 Relay Instruction Manual Date Code 20110408
Firmware and Manual Versions
Instruction Manual
Appendix B
➤ Added a step about disconnecting the rear serial port connection to the Firmware Upgrade Instructions.
20050608
Appendix A
➤ Updated for firmware version R501.
20050523
Appendix A
➤ Updated for firmware version R110/R510.
20050120 Overall, manual updated for new relay model SEL-551C. The manual now is a combined, dual manual for both the
SEL-551 and the SEL-551C relays.
Section 1
➤ Listed major differences for the new SEL-551C, compared to the SEL-551.
➤ Inserted SEL-551C front-panel drawing and hardware overview.
➤ Certain specifications in General Specifications updated and noted for the new SEL-551C.
➤ Updated 5 A nominal current input specification.
➤ Changed power supply (125/250 Vdc or Vac) burden value to <6.2 W.
➤ Added UL/CSA temperature rating (SEL-551C only).
Section 2
➤ Inserted SEL-551C rear-panel drawing and detailed hardware differences such as the SEL-551C having only
conventional terminal blocks.
➤ Reference made to Cable C675, an adapter that brings out EIA-485 pins to a terminal block.
➤ Added EN-61010-1 and the SEL-551C subsection concerning SEL-551C compliance with
EN (European Norm) 61010-1 requirements.
Section 3
➤ Added rising-edge and falling-edge detects as SELOGIC operators.
➤ Clarified the respective limits of Relay Word bits that can be used in the SELOGIC settings of each relay.
➤ Added SEL-551C relay digital I/O information to the Optoisolated Inputs and Output Contacts subsection.
➤ Explained the programmable alarm output contact feature in the SEL-551C.
➤ Torque control setting equations for overcurrent elements can no longer be set directly to logical 0.
➤ Added Relay Word bit TRGTR (Target Reset output) application example to the Front-Panel Target LEDs
subsection.
➤ Added the Latch Control Switch subsection for latch bits LT1–LT8 (SEL-551C only).
➤ Added a Relay Word bit TRGTR (Target Reset output) application example to the Front-Panel Target LEDs
subsection.
Section 4
➤ Created separate Relay Word bit table for the SEL-551C, showing Relay Word bits IN1–IN6 and OUT1–
OUT3 for the new digital I/O mix and latch bit outputs LT1–LT8.
➤ Added programmable software and hardware alarm Relay Word bits SALARM and HALARM, respectively,
for the SEL-551C.
➤ Added Relay Word bit TRGTR (Target Reset output).
➤ In Setting Sheets, torque control settings equation for overcurrent elements can no longer be set directly to
logical 0.
➤ Added additional set and rest SELOGIC settings to the Setting Sheets for latch bits LT1–LT8 (SEL-551C only).
➤ Added note in the Setting Sheets clarifying SER setting range for the SEL-551.
➤ Added additional settings to the Setting Sheets for the optional front-panel EIA-232 serial communications
port for the SEL-551C.
Table A.2 Instruction Manual Revision History (Sheet 4 of 8)
Revision Date Summary of Revisions
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