S8AS Datasheet, PDF (10/26 Pages) Omron Electronics LLC – Smart Power Supply

S8AS
Chart 1: Operation Timing
28.8 V (Abnormal voltage tripping)
(Fixed)
Chart 2: Operation Timing
3.8 A (Abnormal current tripping)
(Settable)
24 V (Rated)
20 V (undervoltage detection)
(Settable)
3.0 A (Normal current)
0
100 ms
t
Alarm display
A21
A10
Undervoltage detection output *
Tripping alarm output *
20 ms
Reset
* The undervoltage detection output and tripping alarm
output are both photoswitch outputs. The output is
normally ON and turns OFF when an alarm is detected.
0
t
Alarm display
A11
Tripping alarm output *
Within 20 ms for instantaneous detection
and 100 ms for standard detection, or
within 1000 ms for extended
detection (depends on tripping type).
* The tripping alarm output is a photoswitch output.
The output is normally ON and turns OFF when
an alarm is detected.
Alarm Functions
Function
Operation
Undervoltage
detection output
(Refer to Chart 1.)
*1, *2
The voltage is monitored and notification is provided using the alarm display and output (LOW) if the preset voltage is
exceeded for more than 80 ms. The alarm display will alternate between the voltage and the alarm code (A21). The primary
voltage is measured at the input terminals.
Undervoltage detection threshold setting range: 18.0 to 26.4 V in 0.1-V increments.The S8AS-24006N and S8AS-48008N are
set to 20.0 V. (Cannot be changed.)
Maintenance
forecast monitor
*1
The time that the power is ON is calculated as the S8AS run time and notification is provided using the alarm display and
maintenance forecast monitor output (LFE) if the preset time is reached. The alarm display will alternate between the run time
and the alarm code (A23).
Display range: FUL (Full), HLF (Half), or 0.0 to 5.0 years.
The internal temperature of the S8AS is monitored using a built-in temperature sensor and notification is provided using the
alarm display and over-temperature output (TMP) if the preset temperature is exceeded for more than 1 s. The alarm display
Over-temperature
(Refer to Chart 3.)
*1
will alternate between the temperature and the alarm code (A30). The over-temperature output is convenient for control
operations, such as operating a cooling fan to suppress temperature increased in the control panel.
Note: The alarm display and over-temperature output are automatically cleared if the temperature falls below the set
temperature.
Display range: −20 to 100°C in 1°C increments.
Temperature setting range: 25 to 90°C in 1°C increments.
Note: 1. Branch outputs are not cut off for the alarm functions
2. The voltage detection is performed on the voltage after AC/DC conversion in the interval circuits. The displayed voltage will be somewhat
different from the value at the output terminals of the power source due to internal voltage drop. To confirm correct output voltages,
measure the voltages at the branch output terminals.
Chart 3: Operation Timing
Temperature
50°C
(Settable)
0
Alarm display
A30
A30
t
A30
Temperature *
* The alarm display and over-temperature output are automatically
cleared (with hysteresis). The over-temperature output is a
photoswitch output. It is normally ON and turns OFF when an
alarm is detected.
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