CHAPTER 6: SETPOINTS
S4 CONTROLS
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL
6–157
Figure 6-66: Arc Flash logic diagram
898865A2.cdr
SETPOINTS
HS Phase
A current
(Iahs
)
RUN
SETPOINTS
Function
:
Disabled
=
0
Trip
HS Phase PKP
:
HS Phase
B
current
(Ibhs
)
HS Phase
C
current
(Ichs
)
Operate Output Relay
1
(TRIP
)
Alarm
OR
OR
HS Phase Currents
AND
Latched
Alarm
AND
Iahs
>
PICKUP
LED
:ALARM
AND
S
R
LA
TCH
Control
LED
:TRIP
Set Dominant
RUN
Ighs
>
PICKUP
HS Ground current
(Ighs
)
Ibhs
>
PICKUP
Ichs
>
PICKUP
SETPOINTS
HS Ground PKP
Light Sensor
1
Light Sensor
2
Light Sensor
3
Light Sensor Input
Light Sensor
4
Light Sensor
1
>
Factory
Threshold
Light Sensor
4
>
Factory
Threshold
Light Sensor
3
>
Factory
Threshold
Light Sensor
2
>
Factory
Threshold
OR
AND
OR
Arc Flash
OP
Logic Operands
RESET
Command
Arc Flash Light
1
O
P
Arc Flash Light
2
O
P
Arc Flash Light
3
O
P
Arc Flash Light
4
O
P
Logic Operands
SETPOINTS
BLOCK
Of
f=
0
AND
HS Ph
A IOC OP
HS Ph B IOC OP
HS Ph C IOC OP
HS GND IOC OP
Logic Operands
RUN
RUN
RUN
RUN
0m
s ¼
cycle
0m
s
0m
s
0m
s
Reset Delay
OR
AND
AND
AND
0m
s
tm
s
SEAL
-IN
TIMER
LA
TCH
Hardware control
¼
cycle
¼
cycle
¼
cycle