21
Internal Configuration Section 2-2
S8AS-48008 (Model with NO Communications and Changeable Parameter Settings)
S8AS-48008N (Model with NO Communications and Unchangeable Parameter Settings)
S8AS-48008R (Model with Communications and Changeable Parameter Settings)
• The S8AS compares the measured input voltage, current, and internal
temperature with the preset parameters. These values can be read on the
S8AS's seven-segment display.
• When an error is detected, the branch output will be cut off or an alarm
will be output. The error code and PV will be displayed alternately on the
seven-segment display.
• When an abnormal voltage or current is detected, the semiconductor
relay will cut off the branch output. In the unlikely event that the semicon-
ductor relay cannot cut off an abnormal current or short-circuit current, the
redundant protection circuit, and the short-circuit protection fuse (12.0 A
minimum) will operate to protect the system.
• The S8AS has a built-in temperature sensor, which can detect a tempera-
ture rise inside the S8AS. When the internal temperature exceeds the
detection threshold, the Over-temperature Output (TMP) photoswitch out-
put will turn OFF.
• When an internal circuit has failed, the components can generate exces-
sive heat. As a safety precaution against this kind of failure, the S8AS is
equipped with a function that cuts off operation using a thermal fuse.
Models that support communications have a RS-485 port, and can be con-
nected to a host computer.
SCREW (M3.5)
INPUT
AC (L)
AC (N)
Auxiliary power
supply circuit
SCREW (M4)
DC OUTPUT
B (+)
A (−)
−V
RS-485
TRP
LOW
LFE
TMP
COM
TRG+
TRG−
Current
detection
Current-ON
detection
+V
+V
Thermal
fuse
Current-
detection
resistor
Current-
limiting
circuit
Branch output 6
Voltage
detection
Current
fuse
Communica-
tions
circuit
(S8AS-48008R only)
Display
circuit
Switches
Temperature
detection
Current-
detection
resistor
Cutoff
circuit
Cutoff circuit
Branch output 1
Branch output 2
Branch output 3
Branch output 4
Branch output 5
Branch output 7
Branch output 8
Voltage
detection
Control
circuits
Process-
ing
circuit
Fuse:
12 A
Noise
filter
Rectifi-
cation
Inrush
current
limit
Harmonic
current
control
Smooth-
ing
Drive
circuit
Voltage-ON
detection
Rectification
and smoothing
Rectification and
smoothing
Communications between
processing circuits (RS-232C)
Processing circuit
(main processing)
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