S8AS Datasheet, PDF (12/26 Pages) Omron Electronics LLC – Smart Power Supply

S8AS
Principle of Operation
The deterioration speed of the electrolytic capacitors varies
considerably with the ambient temperature. (Generally the speed
follows the Arrhenius Law, i.e., for every 10°C increase in the
temperature, the rate of degradation doubles.) The S8AS monitors
the temperature inside the Power Supply, and calculates the amount
of deterioration according to the operating hours and internal
temperature.
Based on this amount of deterioration, the Power Supply will provide
an alarm indication and output when the period left for maintenance
reaches the set value.
Note: 1. Due to degradation of internal electronic parts, replace the
Power Supply approximately 15 years after purchase even
if the maintenance forecast monitor indication and output do
not appear.
2. The maintenance forecast is accelerated or decelerated
according to operating conditions. Periodically check the
display.
3. Acceleration or deceleration of the maintenance forecast
may cause the output to repeatedly go ON and OFF.
4. The accuracy of the maintenance forecast function may be
adversely affected by applications in which the AC input is
frequently turned ON and OFF.
Difference between Expected Life and Replacement Time
OMRON calculates the expected life based on the following
conditions.
1. Rated input voltage
2. Load rate: 50%
3. Ambient temperature: 40°C
4. Standard Mounting
Note: The expected life is calculated by performing a temperature rise
test using an aluminum electrolytic capacitor, and therefore is
not a guaranteed value.
The expected life span of the S8AS is 10 years.
The maintenance forecast is the service life (the Power Supply's
internal temperature is monitored at all times) of the internal
electrolytic capacitors in actual operating conditions, and depends on
the customer's operating conditions. The maximum period of the
maintenance forecast is taken as 15 years.
Other Functions
Function
Startup sequence
(Refer to Chart 5.)
Shutdown
sequence
(Refer to Chart 6.)
Startup Delay
Operation
The connection timing for branch outputs 1 to 6 and 8 can be set individually to offset the connection timing to the load
devices. Creating time delays between starting loads enables safer load operation. It also reduces total inrush current so
that power supply capacity can be optimized.
Setting range:
0.0 to 99.9 s in 0.1-s increments.
For the S8AS-24006N and S8AS-48008N, the settings are 0.0 s for branch output 1, 0.4 s for branch
output 2, 0.8 s for branch output 3, 1.2 s for branch output 4, 1.6 s for branch output 5, 2.0 for branch
output 6, 2.4 s for branch output 7, and 2.8 s for branch output 8. (Cannot be changed.) *
The cutoff timing for branch outputs 1 to 6 and 8 can be set individually to offset the cutoff timing of load devices for the
external tipping input or to enable an emergency stop.
Setting range: 0.0 to 99.0 s in 0.1-s increments. For the S8AS-24006N and S8AS-48008N, all branch outputs have a setting
of 0.0 s. (Cannot be changed.) *
A delay function is provided so that the abnormal current tripping function
or overcurrent alarm function will not be triggered by large initial inrush
currents, e.g., for capacitive loads or lamp loads. The abnormal current
tripping function will function once the set time has elapsed.
(Note: The delay is 40 ms and cannot be changed.)
Current
Alarm function disabled
for large inrush
currents at startup.
0
t
40 ms: Delay
* The sequencing functions are designed for the six branch outputs of one S8AS. There is no synchronization processing between S8AS Power
Supplies when more than one S8AS is used. Sequencing functions for branch outputs 7 and 8 are available only with the S8AS-48008N.
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