Omron S8M - 1-1 Overview of Features and Functions

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Overview of Features and Functions Section 1-1
1-1 Overview of Features and Functions
The S8M Digital Multicircuit Protector incorporates four circuit protectors in
one package. The four 24-VDC, semiconductor relay circuit protectors can be
set digitally.
Unlike mechanical circuit protectors, the S8M is equipped with the following
functions that use digital processing and provide a variety of advantages.
Connection and Tripping
Operations Using
Semiconductor Relays
The four branch outputs are independent of each other and are connected/cut
off by semiconductor relays. In comparison to traditional mechanical circuit
protectors, the semiconductor relays are not consumable parts, so they have
a long lifetime.
Tripping Output Current
Can Be Set in 0.1-A Units
The S8M is a digital device, so each branch output's tripping current can be
set freely between 0.5 and 4.0 A (0.5 to 3.8 A for the S8M-CP04-RS). The
abnormal current tripping value and overcurrent alarm value can be set as the
circuit protector's rated currents. In addition, the tripping type can be set to
standard detection (tripping within 100 ms) or instantaneous detection (trip-
ping within 20 ms).
Voltage, Temperature, and
Run Time Can Also Be
Monitored
The S8M monitors the input voltage, internal temperature, and run time, along
with the input current. The input current, input voltage, and internal tempera-
ture measurements are continuously converted from analog to digital and
these values, as well as the run time, are compared to preset parameters. If a
value exceeds the corresponding set value, the output will be cut off or an
alarm will be output and the error will be indicated on the seven-segment dis-
play. These functions increase the device's added value, while also providing
important maintenance information.
Monitoring Operation with
the Seven-segment
Display
The S8M continuously converts the input voltage, current, and internal tem-
perature from analog to digital. These values, as well as the run time, can be
checked easily on the S8M's seven-segment display.
Typical mechanical circuit protectors
Normal contact-style
circuit protector
S8M Digital Multicircuit
Protector
Overcurrent
tripping device
Overcurrent
detection circuit