Engineering Data - Omron S8VK-R Series Safety

S8VK-R

Engineering Data

Derating Curve
120
100
80
60
40
20
0
−40 −25 −10 0 10 20 30 40 50 60 70 80
Ambient temperature (°C)
A: Standard mounting
B: Standard mounting (contact mounting), 60°C and over: the derating
is 2.5%/°C (Contact mounting is possible only with the S8VK-G;
safety standards will not apply.)
C: Face-up mounting
50°C and over: the derating is 1.25%/°C
Mounting
(A) Standard (Vertical) mounting
(C) Face-up mounting
* Refer to Mounting on page 9.
Reference Value
Value
Reliability (MTBF)
S8VK-R10: 720,000 hrs.
S8VK-R20: 680,000 hrs.
MTBF stands for Mean Time Between Failures, which is calculated according to the probability of accidental device
Definition failures, and indicates reliability of devices.
Therefore, it does not necessarily represent a 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%.
Definition
Normally this is determined by the life expectancy of the built-in aluminum electrolytic capacitor.
4
A
B
C
(B) Standard Mounting
(Contact mounting)
S8VK-R
Switch Mode Power Supplies
(Must be S8VK-G.)
Power Boost Function
This function is possible when used in combination with S8VK-G (All
Models).
Power Boost is a function that can output the temporary repeated
boost current larger than the rated current.
However, it should meet the following four Boost current conditions.
1. Time that the boost current flows: t1
2. The maximum value of the boost current: lp
3. The average output current: lave
4. The time ratio of the boost current flow: Duty
Note: Boost Current Conditions
• t1 ≤ 10 s
• Ip ≤ Boost current (S8VK-R10: 12 A, S8VK-R20: 24 A)
• lave ≤ Rated output current
t1
× 100 [%] ≤ 30%
Duty=
t1 + t2
[A]
t1
t2
• Do not allow the boost current to continue for more than 10
seconds.
Also, do not let the duty cycle exceed the boost current conditions.
These conditions may damage the Power supply.
• Ensure that the average current of one cycle of the boost current
does not exceed the rated output current.
This may damage the Power Supply.
• Lessen the load of the boost load current by adjusting the ambient
temperature and the mounting direction.
Ip: Boost current
Rated current
lave: Average current