S8VK-R

10

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

−25 °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-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

*2

*1

*4

*4

*3

IN1

OUT

IN2

REDUNDANCY

UNIT

POWER SUPPLY

LN

POWER SUPPLY

LN

REDUNDANCY

MONITOR

LOAD

L

N

OPTIONAL

FG