S8VK-G Datasheet, PDF (11/22 Pages) Omron Electronics LLC – Reliable and Easy Operation Resistant in tough environments Easy and fast installation The most compact size on the market

S8VK-G
Overvoltage Protection
Consider the possibility of an overvoltage and design the system so
that the load will not be subjected to an excessive voltage even if the
feedback circuit in the Power Supply fails. If an excessive voltage that
is approximately 130% of the rated voltage or more is output, the
output voltage is shut OFF. Reset the input power by turning it OFF
for at least three minutes and then turning it back ON again.
+30%
(approx.)
+15%
Rated output
voltage
−10%
Overvoltage protection
operating
Variable range
0V
The values shown in the above diagram is for reference only.
Note: Do not turn ON the power again until the cause of the
overvoltage has been removed.
Inrush Current, Startup Time, Output Hold Time
Input ON
AC input
voltage
Input OFF
AC input
current
Inrush current on input application
90%
96.5%
Output
voltage
Startup time (1,000 ms max.)
Hold time
(20 ms min.)
Note: Twice the input current or above will flow during the parallel
operation or redundant system.
Therefore, check the fusing characteristics of fuses and
operating characteristics of breakers making sure that the
external fuses will not burn out and the circuit breakers will not
be activated by the inrush current.
Two phases application for Single phase models
For All Single phase Models, S8VK-G
Basically OMRON single phase power supply can be used on two-
phases of a 3–phase-system when some of conditions satisfy like
below.
1. The supplying voltage is below the maximum rated input.
OMRON Power supply allows the input voltage equivalent or less
than 240 VAC+10%.
Please confirm the input voltage between two lines if the input
voltage satisfies this condition before connecting.
2. The external protector is needed on N input line to secure a safety.
N line has no protection of a fuse internally.
An appropriate fuse or circuit breaker should be connected on N
input line like the following.
L1 L2 L3 PE
A external
fuse or a
circuit breaker
Power Supply
Internal
Fuse
LN
max. 240 VAC+10%
Parallel Operation
The parallel operation of S8VK-G is possible to increase the output
power.
However please consider the following notes when the parallel
operation must be done.
1. The range of ambient temperature for Parallel operation is –25 to
40°C
2. Up to two of the same model can be connected in parallel.
3. Adjust the output voltage difference of each Power Supply to 50
mV or less, using the output voltage adjuster (V. ADJ).
4. There is no current balancing function for S8VK-G. A high output
voltage unit may work at overcurrent state and in this situation, a
life of a Power Supply will be extremely short.
After adjusting the output voltage, confirm the output current of the
two Power Supplies balances.
5. Using the parallel operation will not satisfy UL1310 Class2 output.
6. For Parallel Operation, to balance the current of the each unit, the
length and thickness of each wire connected to the load and each
unit must be same as much as possible.
7. For Parallel Operation with units 120 W or less, connect diodes or
S8VK-R to the outputs of each unit if sudden load variation
influence occurs in the ambient operation environment.
I1
+V
INPUT
−V
IL
Load
+V
INPUT
−V
I2
IL = I1 + I2
Reference Value
Value
Reliability
(MTBF)
Single phase model
15 W: 600,000 hrs
30 W: 580,000 hrs
60 W: 590,000 hrs
120 W: 450,000 hrs
240 W: 360,000 hrs
480 W: 230,000 hrs
Definition
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 a
life of the product.
Life expectancy 10 yrs. Min.
Definition
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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