GE B90 Instruction Manual page 231

5 SETTINGS
• ISOLATOR 1 RESET: This setting indicates a FlexLogic™ operand that acknowledges the isolator alarm. Once the
alarm is acknowledged, the
blocking is removed once the alarm is acknowledged. The acknowledge pulse must last at least 50 ms to take effect.
SETTING
B90 FUNCTION:
Logic = 0
Protection = 1
SETTING
ISOLATOR 1
FUNCTION:
Disabled = 0
Enabled = 1
SETTINGS
ISOLATOR 1 OPEN:
Off = 0
ISOLATOR 1 CLOSED:
Off = 0
SETTING
ISOLATOR 1 RESET:
Off = 0
Isolator position valid
(isolator opened)
ISOLATOR 1 OPEN
ISOLATOR 1 CLOSED
ISOLATOR 1 POSITION
ISOLATOR 1 BLOCK
ISOLATOR 1 ALARM
ISOLATOR 1 RESET
Figure 5–58: ISOLATOR MONITORING SAMPLE TIMING DIAGRAM
GE Multilin
is reset. If the latter operand was configured to block protection, the
ISOLATOR 1 ALARM
RUN
Isolator
Position
Logic
SETTING
ISOLATOR 1 ALARM
DELAY:
XOR
t
PKP
Figure 5–57: ISOLATOR MONITORING SCHEME LOGIC
Isolator position invalid
alarm time
delay
alarm acknowledging
signal
B90 Low Impedance Bus Differential System
5.6 CONTROL ELEMENTS
FLEXLOGIC OPERAND
ISOLATOR 1 POSITION
FLEXLOGIC OPERAND
ISOLATOR 1 BLOCK
0
Positive
S
Edge
Detector
FLEXLOGIC OPERAND
ISOLATOR 1 ALARM
R
Isolator position valid
(isolator opened)
blocking signal resets when
isolator position valid
alarm
acknowledged
5
836002A1.vsd
836744A1.vsd
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