Omron S8AS, User Manual

Page: 22 / 146

4
Overview of Features and Functions
Section 1-1
Tripping Current Can be
Set for Each Branch
Output The abnormal tripping current value can be set for each branch output.
Setting range: 0.5 to 3.8 A (in 0.1 A increments).
Tolerance of current tripping threshold:
±
0.3 A.
Abnormal Current
Detection and Tripping
Time The abnormal current tripping characteristics can be set for each branch out-
put. (This is not possible for the S8AS-24006N/48008N.)
There are three methods that can be used to determine abnormal current trip-
pings. (This is not possible for the S8AS-24006N/48008N.)
■
Standard Detection
When the current exceeds the set value, the branch output is cut off within
100 ms.
■
Instantaneous Detection
When the current exceeds the set value, the branch output is cut off within
20 ms.
■
Extended Detection
When the current exceeds the set value, the branch output is cut off within
1,000 ms.
Error Indication and Alarm
Output for Abnormal
Current Tripping The following will occur when an abnormal current is detected and the branch
output is cut off:
• The branch output status indicator will light red.
• The seven-segment display will show the error code A11 and the abnor-
mal current value alternately.
• The external output terminal for tripping alarms (TRP) will turn ON. (The
photoswitch output will turn OFF.)
Always remove the cause of the abnormal current before resetting the alarm.
Tripping for Total Peak
Output Current When the total branch output current exceeds the set value for a specified
amount of time, all branch outputs will be cut off.
• All branch output status indicators will light red.
• The seven-segment display will flash the error code A12.
• The external output terminal for tripping alarms (TRP) will turn ON. (The
photoswitch output will turn OFF.)
Abnormal Voltage
Tripping If the output voltage exceeds 28.8 VDC, all branch outputs will be cut off in
order to protect load devices.
The following will happen when this occurs:
• The seven-segment display will show the error code A10 and the abnor-
mal voltage alternately.
• The external output terminal for tripping alarms (TRP) will turn ON. (The
photoswitch output will turn OFF.)
Internal Temperature
Monitor
The S8AS has an built-in temperature sensor that constantly measures the
internal temperature. The temperature can be read from the seven-segment
display. The temperature display range is
−
20 to 100
°
C. The temperature sen-
sor has one external output (TMP), which can be used to control cooling
equipment for the control panel.
The temperature output setting range is 25 to 90
°
C.
• The seven-segment display will show the error code A30 and temperature
(
°
C) alternately.