10

S8AS

Chart 1: Operation Timing

Chart 2: Operation Timing

Alarm Functions

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

28.8 V (Abnormal voltage tripping)

20 V (undervoltage detection)

0

24 V (Rated)

Alarm display

Tripping alarm output

*

Reset

Undervoltage detection output

*

(Fixed)

(Settable)

100 ms

t

A21

A10

20 ms

* 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.

t

(Settable)

3.8 A (Abnormal current tripping)

3.0 A (Normal current)

0

Alarm display

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).

A11

* The tripping alarm output is a photoswitch output.

The output is normally ON and turns OFF when

an alarm is detected.

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.

Over-temperature

(Refer to Chart 3.)

*1

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

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.

(Settable)

t

0

A30

A30

A30

Temperature

*

Alarm display

50

°C

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.