Basler BE1-CDS220, Instruction Manual

Page: 185 / 476

BE1-CDS220 Application 8-7
Alarms
Three logic variables drive the front panel LEDs: Relay Trouble (ALMREL), Major Alarm (ALMMAJ), and
Minor Alarm (ALMMIN). A fourth logic variable, Logic Alarm (ALMLGC), has no associated front panel
LED. When the relay self-test detects a problem in the relay (ALMREL) as programmed for the BASIC-87
scheme, the Relay Trouble LED lights, output A operates, and all other outputs are disabled. When a
Major Alarm is detected (ALMMAJ), the associated LED lights and output six operates. When a Minor
Alarm (ALMMIN) is detected, the associated LED lights, but in this scheme, no output relay is
programmed to operate.
Table 8-2. BASIC-87 Contact Input Logic
State Labels
Input Purpose Name Label
Closed Open
IN1
Optional input. Used for CT input circuit 1 breaker status
indication in SER reports. TRUE when breaker closed.
BREAKER-1 CLOSED OPEN
IN2
Optional input. Used for CT input circuit 2 breaker status
indication in SER reports. TRUE when breaker closed.
BREAKER-2 CLOSED OPEN
IN3
Optional input. Used for 86 status indication in SER reports.
TRUE when 86 tripped.
86-TRIPPED TRIPPED NORMAL
IN6 - IN8
Optional inputs. Used for programmable alarms and SER
reporting. For example, sudden pressure trip or transformer
hot-spot alarm, etc. Drives VO13 to VO15 which are
programmable alarm points 21 to 23. Label inputs as
appropriate.
INPUT_6,
INPUT_7,
INPUT_8
CLOSED OPEN
Table 8-3. BASIC-87 Function Block Logic
Function Purpose
BESTlogic
Expression
Mode Setting
87
Used for percent-restrained differential protection with high-speed
unrestrained instantaneous differential protection.
0 1 (Enabled)
51P Used for timed phase-overcurrent protection for CT input circuit 1. 0 1 (CT Input 1)
51N Used for timed neutral-overcurrent protection for CT input circuit 1. 0 1 (CT Input 1)
51Q
Used for timed negative sequence overcurrent protection for CT input
circuit 1.
0 1 (CT Input 1)
GROUP
Auto/Manual Logic: Set to 1 (/0) to enable automatic selection. No
manual selection is used.
/0
1 (Discrete
Inputs)
NOTE
Tables 8-2 through 8-5 provide detailed logic definitions for the inputs, outputs,
protection, and control elements. Only those inputs, logic blocks, virtual switches,
and outputs in use for the BASIC-87 preprogrammed logic are described in the
following Tables.