Schweitzer Engineering Laboratories SEL-321 - Page 352

A-20 Firmware Versions Date Code 20011203
SEL-321/321-1 Instruction Manual
Firmware
Part/Revision No.
SEL-321-1 Relay Version
Description of Firmware
Revision A Main Board:
This firmware differs from previous versions as
follows:
- Added M
IRRORED BITS protocol MB8. MB8
has two stop bits.
- Prevent inadvertent cancellation of Fast
Operate by a Fast Meter response.
SEL-321-1-R122-990415 60 Hz, 5 Amp, 1 I/O Board, Rev. A
SEL-321-1-R172-990415 50 Hz, 5 Amp, 1 I/O Board, Rev. A
SEL-321-1-R222-990415 60 Hz, 5 Amp, 2 I/O Boards, Rev. A
This firmware differs from previous versions as
follows:
- Improved diagnostics.
SEL-321-1-R120-980806 60 Hz, 5 Amp, 1 I/O Board, Rev. A
SEL-321-1-R170-980806 50 Hz, 5 Amp, 1 I/O Board, Rev. A
SEL-321-1-R220-980806 60 Hz, 5 Amp, 2 I/O Boards, Rev. A
This firmware differs from previous versions as
follows:
- Correct problem where relay incorrectly
processed SEL
OGIC Control Equations
SEL-321-1-R119-980709 60 Hz, 5 Amp, 1 I/O Board, Rev. A
SEL-321-1-R169-980709 50 Hz, 5 Amp, 1 I/O Board, Rev. A
SEL-321-1-R219-980709 60 Hz, 5 Amp, 2 I/O Boards, Rev. A
This firmware differs from previous versions as
follows:
- Changed series compensation logic
- Changed long memory constant time to 31.75
cycles
SEL-321-1-R118-980601 60 Hz, 5 Amp, 1 I/O Board, Rev. A
SEL-321-1-R168-980601 50 Hz, 5 Amp, 1 I/O Board, Rev. A
SEL-321-1-R218-980601 60 Hz, 5 Amp, 2 I/O Boards, Rev. A