Omron S8AS User Manual page 136

Glossary
Term
reset method
maintenance forecast monitor
function
Run Mode
semiconductor relay
Setting Mode
shutdown sequence
standard detection (alarm
type and tripping type)
startup delay
startup sequence
Test Mode
thermal fuse
TMP
total output current
TRG(+)/(−)
TRP
tripping type
undervoltage detection output If the output voltage is below the set value, the undervoltage detection output
118
The reset method describes how to reset an error status after an error cut off
has occurred and the cause has been removed. You can use the Reset Key
method (KEY) or the Reset Key and power restart method (ALL).
The status of the electrolytic capacitor is measured form the power-ON time
and internal temperature of the Power Supply and the user is notified of the
replacement time. The maintenance forecast monitor output can be set for 0.0
to 5.0 years (approximate). The seven-segment display will show the error code
A23 and the external output terminal maintenance forecast monitor output
(LFE) will turn ON. (Photoswitch output OFF.)
This is the normal operation mode for S8AS. The branch outputs are con-
nected and the output voltages, output currents, internal temperature, and
power-ON time are monitored continuously.
Branch outputs are not cut off mechanically in the S8AS. Each branch output is
connected/cut off by a high-capacity FET (transistor).
This operating mode is used to set the parameters.
If branch outputs are cut off by the external tripping input (TRG), the shutdown
sequence can set a separate delay for cutting off each branch output.
Each branch output's tripping current and abnormal current can be detected
with standard detection (tripping within 100 ms), instantaneous detection (trip-
ping within 20 ms), or extended detection (tripping within 1,000 ms).
With standard detection, the output will be cut off or the alarm will be output
within 80 ms if the current is higher than the tripping threshold continuously for
20 ms or longer.
Tripping operation can be disabled for 40 ms when the power is turned ON in
order to prevent the inrush current from being detected as an abnormal current
and cutting off operation. The peak output current value will still be updated
during the startup delay.
The startup sequence can set a separate delay for the connection of power to
each branch output when the power is turned ON. This function can reduce the
inrush current and voltage drop that occur when the power is turned ON.
Each branch output can be set to ON or OFF (connected or disconnected).
Also, the operation of the startup sequence and shutdown sequence can be
verified.
If current is not cut off by the semiconductor relay alone, the built-in thermal
fuse will operate to protect the circuit.
After a fuse has operated, the branch output cannot be used any longer.
An external output terminal.
TMP is an abbreviation for the over-temperature output terminal.
The photoswitch output turns OFF if the S8AS internal temperature exceeds
the over-temperature output threshold.
The total output current is the sum of all the branch output currents. There is a
maximum limit to the total current in addition to the maximum limit of each
branch output.
The external tripping input terminals.
TRG is an abbreviation for "trigger" and represents the external tripping input. It
is used to cutoff branch outputs from an external source. The shutdown
sequence applies to the cutoff process.
An external output terminal.
TRP is an abbreviation for the tripping alarm output terminal. The photoswitch
output turns OFF if there is an abnormal current or abnormal voltage tripping
event.
A branch output's tripping current can be detected with standard detection,
instantaneous detection, or extended detection. (This is not possible for the
S8AS-24006N/48008N.)
(LOW) photoswitch output turns OFF. The detection threshold can be set
between 18.0 and 26.4 VDC.
Meaning
Appendix A
Page
9, 76
5, 34,
50, 64
7, 82
3
7, 60
6, 38, 67
4, 30, 62
34
6, 37, 66
7, 78
6, 34
12, 17,
50
xv, 33
12, 17,
50
12, 17,
50
62
12, 29,
63