Dc power connection, Attaching the ferrite core, Fig. 31: opened ferite core with wires – Kontron KISS 4U Short KTQ67Flex User Manual

Page 34

9. Starting Up

KISS 4U Short V2 – User's Guide (Version 1.01)

9.2. DC Power Connection

The DC version of the KISS 4U Short V2 platform is equipped with a +24V or-48V power supply (with a 2-pin terminal block
and an ON/OFF power switch)

It must be ensured that the platform can be powered ON and OFF via an easy accessible two pole isolating
switch and an overload protection. These should be incorporated in the building installation wiring.
The unit is only completely disconnected from the DC power source, when:

it is switched OFF via the ON/OFF switch of the DC PSU

the DC power cord is disconnected either from the power source or the unit. Therefore, the DC power
cord and its connectors must always remain easily accessible.

Please ensure that during the DC connection procedure, there is no power flowing from the external
DC power source to the KISS 4U Short V2 system.

9.2.1. Attaching the Ferrite Core

Before you connect the KISS 4U Short V2 with DC Power Supply Unit (PSU) to a DC power source, you have
to attach the ferrite core (7427113, manufacturer: Würth Elektronik) to the wires that are used for the
power connection:

2x 2x wires with a minimum cross section of 2.5 mm

for the +24VDC PSU

2x wires with a minimum cross section of 1.5 mm

for the -48VDC PSU

Only with the attached ferrite core are ensured the requirements of EMC standards (for emission and
immunity).
Do not close the ferrite core before you have attached it to the power wires!

To attach the ferrite core, proceed as follows:

1. Open the ferrite core as much as possible.

2. Put the two wires together.

3. Lay the wires into the middle channel of the one half of the ferrite core, at 5-8 cm (2-3 in) to one end of the wires. Run

the wires lengthwise, one time around the ferrite core (see figure below), so that the wires are running out at the
other end of the ferrite core.

4. Fold the two halves of the ferrite core, without closing the ferrite case completely.

5. Check the location of the wires in the channel of the ferrite core. If the winding loop is too large, you have to reduce

it, by pulling the end of the longer wires.

6. Close the ferrite core completely until the clamp snaps in place.

5-8 cm [2-3 in] to

power terminals of the

KISS 4U Short V2

Wires to

DC power source

Opened
ferrite core

Fig. 31: Opened ferite core with wires

www.kontron.com