Sel 421 - Page 332

U.A.24
SEL-421 Relay User’s Guide Date Code 20090715
Firmware and Manual Versions
Instruction Manual
Reference Manual
Section 1
➤ Added NAND gates (SPOA, SPOB, and SPOC) at the DTA, DTB, and DTC SELOGIC Settings inputs in
Figure 1.60, Trip During Pole Open to TPA.
Section 3
➤ Corrected Example 3.6.
➤ Change “conditioning” to “sequence” in the sentence before Figure 3.8 and in the caption for Figure 3.8.
➤ Corrected typographical error.
20020918
User’s Guide
Appendix A
➤ Included information on new firmware R107.
Reference Manual
Section 1
➤ Modified Figure 1.9 and Figure 1.63.
20020819
User’s Guide
Appendix A
➤ Included information on new firmware R106.
➤ Removed “Instruction” from appendix title.
20020621 Removed Manual Change Information section and integrated it into User’s Guide Appendix A: Firmware and
Instruction Manual Versions.
User’s Guide
Section 2
➤ Updated Figure 2.2, Figure 2.3, Figure 2.10, Figure 2.13, Figure 2.21, Figure 2.25, Figure 2.27, and
Figure 2.28.
Appendix A
➤ Firmware updated.
Reference Manual
Section 6
➤ Updated Table 6.9.
➤ Updated Tab l e 6.10.
20020528
User’s Guide
Appendix A
➤ Firmware updated.
Reference Manual
Section 6
➤ Updated Tab l e 6.5.
20020501
Reference Manual
Section 6
➤ Updated Tab l e 6.17.
Appendix C
➤ All UCA2 control points were made readable. Default data were set for the UCA2 FAULT model.
20020417
User’s Guide
Appendix A
➤ Firmware updated. Spurious Quart interrupts caused by varying character spacing will cause the relay to
disable. This condition occurs when a communications processor is automatically retrieving data from the
relay simultaneously with a serial port terminal session.
Table A.5 Instruction Manual Revision History (Sheet 14 of 16)
Revision Date Summary of Revisions
Courtesy of NationalSwitchgear.com