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• When the tripping alarm output operates, always remove the cause of the output first and then reset the
alarm.
• When cycling the input power supply, always remove any problems first and then turn ON the input power
supply.
■ Startup Time
When the input power is turned ON to the S8AS, a hardware check, software check, and initialization process-
ing are performed before the branch outputs are turned ON. Approximately three seconds is required. When
using the S8AS with other control equipment, incorporate the startup time of the S8AS in the overall system
design.
■ Installation
• Mounting Direction
Mount the S8AS to a DIN Rail using the standard mounting direction. Do not mount it in any other direction,
such as face up.
(Refer to 3-1 Installing the S8AS.)
• Mounting Space
The long-term reliability of the S8AS can be increased by installing it properly and sufficiently considering heat
dissipation.
Be sure to install the S8AS so that the air flow circulates around it, because the S8AS is designed to radiate
heat by means of natural air circulation.
■ Derating Curve
The temperature range within which the S8AS can be used is restricted by the maximum current that normally
flows for the total output. This restriction is given as a derating curve.
Note
1. The ambient temperature is measured at a point 50 mm below the S8AS.
2. Use forced cooling if necessary to satisfy the derating curve.
3. For 480-W models, reduce the load to 80% or less for long-term use at an input voltage of 95 VAC or less.
■ Abnormal Voltage Tripping
1.
The S8AS has an abnormal voltage tripping function. All branch outputs will be cut off if the input voltage
exceeds 28.8 VDC. This function, however, does not protect loads and internal parts from high voltages in
all cases. Be sure the output voltage is within the rated range.
2.
Outputs may be cut off by the abnormal voltage protection with loads that generate reverse peak electro-
motive force.
xiv
Precautions for Correct Use
120
100
80
60
40
20
0
−20 −10
0
10
20
1
30
40
50
60
70
Ambient temperature (°C)
80
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