Schweitzer Engineering Laboratories SEL-352-1 - Page 7

Date Code 20010731 Manual Change Information v
SEL-352-1, -2 Instruction Manual
Revision
Date
Summary of Revisions
981030 In Section 2: Installation updated Figure 2.1: SEL-352-1 Relay Dimensions,
Panel Cutout, and Drill Plan and Figure 2.5: SEL-352-1 ConnectorizedÉ
Rear Panel (Model 03521Y) to document new current shorting connectors for
Connectorized models.
Update model numbers and correct formatting throughout manual.
980617 Update manual to include hardware changes. Model 03521J, a new 3U, one I/O
board, Connectorized version has been created, employing plug-in connectors
for relay power, ac analog inputs, and dc control inputs/outputs.
980102 New manual for SEL-352-1 Relay was created from last revision of SEL-352
Relay, dated 970820. The SEL-352-1 Relay will replace the SEL-352 Relay as
the standard relay offering.
Performance enhancements installed to create the 352-1 version are as follows:
1. Subsidence current detection logic, to shorten the dropout time of
overcurrent elements.
2. Programmable Display Points and Local Bits, to improve front-
panel displays and functionality.
3. Nonvolatile Latch Bits for SEL
OGIC control equations, to maintain
bit status when relay is powered down.
4. Threshold compare capability for SEL
OGIC control equations, to add
magnitude comparisons to the normal Boolean-like logic
expressions.
5. Remote Bit control via the CON n serial port command.