Omron S8AS User Manual

34
Basic Function Details Section 2-4
Startup Delay Normally, a large inrush current may run through the system when equipment
starts. Tripping operation can be disabled for a short time after the semicon-
ductor relay goes ON in order to prevent this inrush current from being
detected as an abnormal current and cutting off operation. This temporary
disabling of the tripping function is called the startup delay.
Note The startup delay disables the tripping operation for the specified
period of time. The inrush current during this time can be displayed
as the peak output current. The S8AS, however, contains a current-
restricting circuit, so the peak value is not necessarily an accurate
measure of the peak inrush current of the connected device.
Safety Functions
Short-circuit Protection
Fuse
If an error occurs that prevents the semiconductor relay from cutting off a
branch output, the short-circuit protection fuse will blow to protect the circuit.
Note If the fuse blows, that branch output cannot be used.
Thermal Fuse If an error occurs that prevents the semiconductor relay from cutting off a
branch output and the temperature of the S8AS's internal resistors rises
abnormally high, the S8AS's thermal fuse will blow to prevent a fire hazard.
Note If the fuse blows, that branch circuit cannot be used.
2-4-3 Maintenance Forecast Monitor Function
The maintenance forecast monitor function calculates the replacement time
from the power-ON time and internal temperature. The maintenance forecast
monitor output (LFE) will operate when the calculated value reaches the set
value. (The set value is fixed at 0.5 years for the S8AS-24006N/48008N and
cannot be changed.) When the maintenance forecast monitor output (LFE) is
turned ON, the error code A23 and the estimated replacement time are dis-
played alternately on the seven-segment display.
Tripping Alarm
Output (TRP)
OFF (open)
ON (closed)
Startup delay (40 ms)
100 ms max. (standard detection)
Branch output
current
Branch output
voltage
Power supply
voltage
No cutoff during startup delay even if set value is exceeded.
Abnormal current tripping threshold
OFF (open)
Initial capacity
Electrolytic
capacitor capacity
Capacity at replacement time
ful
hlf
4.5
(L-0.5)
1.5
1.0
0.5
0.0
Seven-segment display
Maintenance forecast
monitor output
LFE output when L = 1.0
5.0 2.0 1.5
0.5 0
1.0

Omron S8AS Specifications

General

Brand	Omron
Model	S8AS
Category	Power Supply
Language	English