Schweitzer Engineering Laboratories SEL-251 - Page 199

Date Code 20000421 Appendix A A-1
SEL-251, -2, -3 Instruction Manual
APPENDIX A - FIRMWARE VERSIONS
The firmware versions are listed in chronological order (most recent firmware at top).
Firmware
Part/Revision No.
Description of Firmware
SEL-251 Firmware, Revision 4 Main Board Configuration
This firmware differs from previous versions as follows:
- INST target is now independent of phase targets.
SEL-251-3-R552 251-3 50 Hz 1 A ABC rotation extended fast meter fast operate
SEL-251-3-R452 251-3 50 Hz 5 A ABC rotation extended fast meter fast operate
SEL-151-R610 151 60 Hz 5 A ACB rotation
SEL-251-2-R607 ACB rotation extended fast meter
SEL-251-3-R605 ACB rotation fast operate
SEL-251-2-R410 251-2 60 Hz 5 A extended fast meter
SEL-251-3-R406 251-3 60 Hz 5 A fast operate
SEL-151-R563 151 50 Hz 1 A
SEL-151-R513 151 60 Hz 1 A
SEL-151-R463 151 50 Hz 5 A
SEL-151-R418 151 60 Hz 5 A
The functionality of these versions is identical to previous versions.
SEL-251-3-R551 251-3 50 Hz 1 A ABC rotation extended fast meter fast operate
SEL-251-3-R451 251-3 50 Hz 5 A ABC rotation extended fast meter fast operate
SEL-151-R609 151 60 Hz 5 A ACB rotation
SEL-251-2-R606 ACB rotation extended fast meter
SEL-251-3-R604 ACB rotation fast operate
SEL-251-2-R409 251-2 60 Hz 5 A extended fast meter
SEL-251-3-R405 251-3 60 Hz 5 A fast operate
SEL-151-R562 151 50 Hz 1 A
SEL-151-R512 151 60 Hz 1 A
SEL-151-R462 151 50 Hz 5 A
SEL-151-R417 151 60 Hz 5 A
This firmware differs from previous versions as follows:
- Debounce all control inputs.
- Extinguish RS and LO LEDs when relay is disabled.
- Enhance 2020 compatibility.
SEL-151-R416 151 60 Hz 5 A
SEL-251-3-R404 251-3 60 Hz 5 A fast operate
Added new version:
SEL-251-3-R450 251-3 50 Hz 5 A ABC rotation extended fast meter fast operate