Omron S8AS, Руководство пользователя

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5
Overview of Features and Functions
Section 1-1
• The external output terminal for over-temperature (TMP) will turn ON.
(The photoswitch output will turn OFF.)
Maintenance Forecast
Monitor Function
This function calculates the condition of the electrolytic capacitor based on the
power-ON time and internal temperature of the Power Supply to forecast
when the Power Supply needs to be replaced. The monitor value can be set to
between 0.0 and 5.0 years (approximate) in increments of 0.5 years.
The following occurs when the estimated replacement time reaches the set
value:
• The seven-segment display will show the error code A23 and the replace-
ment time (years) alternately.
• The external output terminal for the maintenance forecast monitor (LFE)
will turn ON. (The photoswitch output will turn OFF.)
Safety Functions
If an abnormal voltage or current is detected, the semiconductor relay will cut
off the branch output. In the unlikely event that the semiconductor relay can-
not cut off an abnormal current or short-circuit current, the short-circuit protec-
tion fuse will cut the circuit to protect the system. If the branch output is cut off
by the fuse, an error indication will not be shown on the seven-segment dis-
play and the alarm output (TRP) will not operate.
The overcurrent protection fuse or over-temperature fuse cannot be replaced.
If a fuse burns out, use a different branch output or replace the S8AS.
External Outputs
The S8AS has 4 external outputs: the Tripping Alarm Output (TRP), Under-
voltage Detection Output (LOW), Maintenance Forecast Monitor Output
(LFE), and Over-temperature Output (TMP).
Output Output condition Restoration condition
Tripping Alarm
Output (TRP) • Abnormal voltage tripping
If the output voltage exceeds
28.8 V, all branch outputs are
cut off.
• Abnormal current tripping
If a current exceeding the set
value is detected, the corre-
sponding branch output is
cut off.
The output status is retained
when power is interrupted but
can reset with the reset oper-
ation.
Test Mode only
When even one branch output
is disconnected. Restore by connecting all
branch outputs, or by switch-
ing to any mode other than
Test Mode.
Undervoltage Detec-
tion Output (LOW) Output when the 24 VDC out-
put falls below the undervolt-
age detection threshold. This output can be reset with
the reset operation. If the
alarm is cleared when the
power is turned ON, the out-
put will be reset.
Over-temperature
Output (TMP) Output when a temperature
exceeding the threshold is
detected. The output is reset automati-
cally when the temperature
falls to 3
°
C below the over-
temperature output threshold.
Maintenance Fore-
cast Monitor Output
(LFE) • Output when the estimated
replacement time falls below
the set value.
• Output when the replace-
ment time can no longer be
calculated due to rise in tem-
perature of the power supply
section.
• Prepare to replace the
Power Supply.
• Take measures to lower the
internal temperature.