S8VS datasheet(30/38 Pages) OMRON

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S8VS

Maintenance Forecast Monitor Function

The Power Supply is equipped with electrolytic capacitors.

The electrolyte inside the electrolytic capacitor penetrates the sealing

rubber and evaporates as time passes since it is manufactured, which

causes deterioration of characteristics such as decreasing the

capacitance, etc.

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 capacitor. It does not predict

failures caused by other reasons.

Relationship between Indicated Values and Output of Set Values

Principle of Operation

The deterioration speed of the electrolytic capacitor varies

considerably according to the ambient temperature. (Generally the

speed follows “Rule of Two for every 10

°C”; for every 10°C increase

in temperature the rate of degradation doubles according to

Arrhenius’s equation.) The S8VS-

@@@24A@@ monitors the

temperature inside the power supply, and calculates the amount of

deterioration according to the running hours and inside temperature.

Judging by this amount of deterioration, the power supply will give the

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

indication and output of maintenance forecast monitor are

not issued.

2. The maintenance forecast is accelerated or decelerated

according to operating conditions. Periodically check

indication.

3. Acceleration or deceleration of the maintenance forecast

may cause the output to repeatedly go ON/OFF.

Only the S8VS-09024A

@@, S8VS-12024A@, S8VS-

18024A

@, S8VS-24024A@, and S8VS-48024A are

equipped with output.

4. The accuracy of the maintenance forecast function may be

adversely affected by applications in which the AC input is

frequently turned ON/OFF.

Reference Values (15-W to 480-W Models)

Note: The maintenance forecast is the service life (the power

supply’s internal temperature is monitored at all times) of the

internal electrolytic capacitor in actual operating conditions,

and varies according to the customer’s operating conditions.

15 years is taken as the maximum period of the maintenance

forecast.

−0.5)

5.0

L=2.5

L=0.5

2.5

2.0

1.5

1.0

0.5

Initial capacity

"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.

In case of setting L between 2.5 and 5.

Maintenance forecast monitor output

T: Maintenance time

until replacement

The numerical value

decreases with time.

Main display

Capacity of Capacitor

Capacity level

at replacement

Note: This function can be set only on the S8VS-09024A

@@, S8VS-12024A@, S8VS-18024A@, S8VS-24024A@, and S8VS-48024A.

L: Maintenance forecast set value (See note.)

0.0 to 5.0, 0.5 steps

Item

Value

Definition

Reliability

(MTBF)

15 W to 240 W:

135,000 hr min.

480 W:

60,000 hr min.

MTBF stands for Mean Time

Between Failures, which is

calculated according to the

probability of accidental device

failures, and indicates reliability of

devices.

Therefore, it does not necessarily

represent the life of the Product.

Life

expectancy

10 yr min.

The life expectancy indicates

average operating hours under the

ambient temperature of 40

°C and a

load rate of 50%. Normally this is

determined by the life expectancy of

the built-in aluminum electrolytic

capacitor.

S8VS Datasheet(PDF) 30 Page - Omron Electronics LLC

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