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.
(L
−
0.5)
5.0
L=2.5
L=0.5
2.5
2.0
1.5
1.0
0.5
0
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 years.
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 hrs min.
480 W:
60,000 hrs 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 yrs. 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.
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19
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