S8AS datasheet(11/26 Pages) OMRON

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S8AS

Maintenance Forecast Monitor Function

Indication and Output

When the Product is purchased, “ful” will be displayed. As the

electrolytic capacitors deteriorate, the display will change to “hlf”

(Refer to Maintenance Forecast Monitor Function). “ful” will be

displayed for the maintenance forecast display for approximately one

month after the Power Supply is first turned ON. The accumulated

value will then be displayed depending on the ambient conditions.

(However, the “hlf” display may not appear, depending on the

application environment and the set value for maintenance forecast.)

If the maintenance forecast setting L (which can be set to 0.0 to 5.0

years in 0.5-year increments) is set to a value larger than two years,

the display automatically changes to a value (L - 0.5) after the

remaining time to maintenance is reduced to the set number of years,

and an alarm (A23) and the remaining time will be displayed

alternately.

If the setting is less than 2.0 years, the display changes to a value

(1.5) after the remaining time becomes less than two years, and after

the remaining time becomes less than the set time, an alarm (A23)

and the remaining time (L - 0.5) will be displayed alternately.

If the alarm (A23) and a numeric value are displayed alternately, the

transistor (maintenance forecast output terminal (Yrs)) will turn OFF

to indicate the need for maintenance., i.e., there will be no continuity

at the maintenance forecast output terminals.

(The LEF output will turn OFF when the maintenance time has been

reached.)

Example: Display When the Time Remaining to the

Maintenance Time Is Less Than 0.5 yr

Note: 1. The time remaining to maintenance is based on continuous

operation, not including the time when the power supply is

turned OFF.

2. “ful” will be displayed until approximately one month of

time has passed to enable estimating the speed of

deterioration. The output will remain ON (i.e., there will be

continuity at the maintenance forecast output terminal

(Yrs)).

3. For details on the display, refer to Relationship between

Displayed Values and Output of Set Values.

Maintenance Forecast Monitor Function

The Power Supply is equipped with electrolytic capacitors.

The electrolyte inside the electrolytic capacitors penetrates the

sealing rubber and evaporates as time passes after it is

manufactured. This causes deterioration of characteristics, such as

decreasing the capacitance.

Due to this deterioration of the characteristics of the electrolytic

capacitor, the Power Supply decreases its performance as time

passes.

The maintenance forecast monitor function shows an approximate

period left for maintenance of the Power Supply due to deterioration

of electrolytic capacitors. When the period left for maintenance that

the power supply forecasts reaches the set value, an alarm is

indicated and an output signal is triggered. Use this function to know

the approximate replacement timing of the Power Supply.

Note: The maintenance forecast monitor function indicates an

approximate period left for maintenance, based on

deterioration of the electrolytic capacitors. It does not predict

failures resulting from other causes.

Relationship between Displayed Values and Output of Set Values

Yrs

°C

Yrs

°C

Yrs

°C

Yrs

°C

Yrs

°C

Yrs

°C

Initial capacity

− 0.5)

L: Maintenance forecast set value

0.0 to 5.0, 0.5 steps

When L is set to between 2.5 and 5 years.

5.0

Maintenance forecast

monitor output

L = 2.5

T: Maintenance time until replacement

L = 0.5

The numeric value

decreases with time.

2.5

2.0

1.5

1.0

0.5

Main display

Electrolytic capacitor capacity

Capacity at

replacement

time

"1.0" is displayed on the main display for the duration

that the maintenance forecast up to replacement

satisfies the condition 1.0

≤ T < 1.5.

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