S8AS datasheet(24/26 Pages) OMRON

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S8AS

• Do not push more than 100 N of force to the terminal block when

tightening screws.

• Be sure to tighten the lock screws on the sides of the screwless

connector after connecting it to the S8AS. When removing a

screwless connector, be sure the lock screws are completely loose

before pulling on the connector.

• Be sure to remove the sheet covering the Product during

installation before turning ON the power.

Installation Environment

• Do not use the Product where it would be subjected to shock or

vibration. A device such as a contact breaker may be a vibration

source. Set the Product as far as possible from possible sources of

shock or vibration. Additionally, install a PFP-M End Plate on each

end of the Product after mounting it to a DIN Rail.

• If the Product is used in an area with excessive electronic noise, be

sure to separate the Product as far as possible from the noise

sources.

Ambient Operating and Storage Environment

• Store the Product at an ambient temperature of −25 to 65°C and

relative humidity of 25% to 90%.

• Internal parts may occasionally be deteriorated or damaged. Do

not use the Product in conditions exceeding the derating curve (in

portion (1) of the Derating Curve on page 8).

• Use the Product where the relative humidity is 25% to 85%.

• Do not use the Product where it would be subjected to direct

sunlight.

• Do not use the Product where it would be subjected to the

possibility of penetration of liquid, foreign substance, or corrosive

gas.

• To maintain performance of the maintenance forecast monitor,

make sure the following conditions are satisfied for long-term

storage. For storage exceeding three months, keep the Product at

a temperature of

−20°C to 30°C and a humidity of 25% to 70%.

Output Voltage Adjustment

• The output voltage adjuster (V.ADJ.) may possibly become

damaged. Do not apply more than the required force.

• Do not exceed the rated output capacity and rated total output

current after adjusting the output voltage.

Periodic Inspections

Under normal operating conditions, the Product will require several

years or even more than ten years until the maintenance forecast

monitor function operates. When using the Product for an extended

period of time, perform the following procedure periodically to confirm

that the output for the maintenance forecast monitor function (LFE) is

operating correctly.

a) Change to Run Mode.

b) Confirm that the (LFE) output is ON (i.e., that there is electrical

continuity between (LEF) and (COM)).

Precautions for Correct Use

Tripping Performance

• When the tripping alarm output operates, always remove the cause

of the output first and then reset the alarm.

• When using a load with a fixed-power operation, the S8AS may

cause a cutoff when the power supply is turned OFF.

• Outputs may be cut off by the abnormal voltage protection with

loads that generate reverse peak electromotive force.

• Tripping performance is depends on the ambient operating

temperature. Use the Product within the derating range. Refer to

the Derating Curve on page 8.

• It is conceivable that internal parts may be deteriorated or

damaged. Do not repeatedly perform cutoff or recovery operations

more than necessary.

Maintenance Forecast Monitor Function

The accuracy of the maintenance forecast monitor function will be

reduced in applications where the AC input turns ON and OFF

frequently.

Total Peak Output Current

The S8AS is designed to provide a temporary peak current to provide

the overcurrent required to start load devices.

The total peak output current for all branch outputs combined is given

below. However, if even one of the following conditions is not satisfied

by the total current, all branch outputs will be cut off to ensure safety

based on the amount of peak current and the usage time.

• 240-W Models

Input voltage range: 200 to 240 VAC

Total peak current/Peak current pulse width:

17 A max./2 s max.

15 A max./5 s max.

13 A max./10 s max.

12 A max./20 s max.

• 480-W Models

Input voltage range: 200 to 240 VAC

Total peak current/Peak current pulse width:

27 A max./1 s max.

25 A max./2 s max.

22.5 A max./5 s max.

Note: 1. If the input voltage range is outside of the range given

above, or if the total output current exceeds the maximum

peak current, the S8AS may be cut off due to unstable

internal operation.

2. After the load device has been started, ensure that the total

current in steady state remains within the rated values.

3. When the peak current has exceeded the rated current, do

not allow the peak current to flow again for the next 60

seconds.

Startup Sequence and Shutdown Sequence

The sequencing functions are designed for the branch outputs of one

S8AS. There is no synchronizing processing between S8AS when

more than one S8AS is used.

Startup Delay

The startup delay will not operate when a relay or other device is used

for ON/OFF control on the output side of the S8AS, so a cutoff

operation may occasionally occur.

Dielectric Strength Test

• The S8AS is designed to withstand 3,000 VAC for 1 minute

between the AC input terminals collectively and the branch output,

I/O signal, or communications terminals collectively. When testing,

set the cutoff current for the withstand voltage test device to 20 mA.

• The S8AS may possibly be damaged from the impulse voltage if a

testing device switch is used to abruptly apply or cut off 3000 VAC.

Increase the applied voltage gradually using the voltage

adjustment on the testing device.

• When testing terminals together, always short the specified

terminals so that the voltage is applied to all of the terminals at the

same time.

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