Omron S8VK-R Series Manual Download Page 10

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S8VK-R

Mounting

The long-term reliability of the S8VK-R can be increased by installing
it properly and sufficiently considering heat dissipation.
Install the S8VK-R so that the air flow circulates around it, because
the S8VK-R is designed to radiate heat by means of natural air
circulation.
Can be used in a contact mounting with the S8VK-G (not covered by
safety certification). Two S8VK-G units cannot be mounted together
in a contact mounting.

Input Voltage

Rating
S8VK-R10: DC5 to 30V
S8VK-R20: DC10 to 60V

Input Power Supply Selection

This product contains an internal fuse. If a power supply other than
the S8VK-G is used, the fuse may blow, depending on the state of the
load. Do not connect a power supply other than the S8VK-G to this
product.
If you are building a redundant system, never use in a state that
exceeds the rated current of the power supply. If one of the power
supplies goes down, there is a risk that the voltage on the load side
cannot be attained.
Use the same model for the power supplies that are connected.
On rare occasions internal element deterioration and damage may
occur if use is continued in a short-circuit or over-current state. Do not
continue use for more than 10 seconds.
Do not use in applications where load rush current or overload may
frequently occur. Slight risk of deterioration and damage due to
internal loss.
The signal output / status LED may occasionally not operate stably.
When using in environments where the temperature is less than

−

C, always adjust the 5 V power supply to 5.3 V or higher.

Dielectric Strength Test

The S8VK-R is designed to withstand a voltage test of 1 kV AC
between all input/output terminals and the chassis, and 0.5 kV AC
between all input/output terminals and the signal output terminal, for
one minute.

Note:
1. The S8VK-R may possibly be damaged from the impulse voltage

if a testing device switch is used to abruptly apply or shut off 1 kV
AC, 0.5 kV AC. Increase the applied voltage gradually using the
voltage adjustment on the testing device.

2. When testing, always short-circuit all terminals to prevent damage

to the output terminal.

Signal output

Photo switch output
Photo switch ON when input voltage difference is 2.4 V typ. or less.
30 VDC max. (LVLC), 50 mA max., residual voltage when ON: 2 V
max., leakage current when OFF: 0.1 mA max.

Status display LEDs

The status display LEDs show the status of the input power as shown
in the table below.
Redundancy OK

Green on: Input voltage difference is 2.4 V typ. or less.

Voltage balance

Green on: Input voltage difference is 50 mV typ. or less.

The redundancy OK display/signal operates when the voltage
difference is no more than 2.4 V typ. When using a 5 V or 12 V power
supply, verify that there is no difference in the output voltages of the
power supplies.
The voltage balance display does not guarantee current balance. The
degree of balance varies by model, and therefore if you require
operation with balanced current, check the output current of each
power supply unit.
The models below use a voltage balance display, and cannot be used
as a current balance.
S8VK-G015

S8VK-G03012

S8VK-G03024

S8VK-G06024
When adjusting the voltage based on the voltage balance, adjust the
voltage of only one power supply. If you must adjust the voltages of
both power supplies, be sure to check the output voltage before use.
If you want to use the voltage balance display to ensure that the
expected life is obtained, use the same thickness and length of wiring
from each S8VK-G to the S8VK-R.

Connections

It is possible to connect S8VK-R like below.

Precautions for Correct Use

1. Convection of air

2. 75 mm min.

3. 75 mm min.

4. 20 mm min.