Beijer-electronics EPC TA70 AM EN Manual de usuario descargar pdf (Pagina 28)

Additional Installation Tips

7.5 Safety

Most of the Panel PCs are fed with 24 V DC.

Power supply

230 V AC to 24 V DC

Power supply

230 V AC to 24 V DC

Power supply

230 V AC to 24 V DC

Panel PC

Distance?

Small controller with expansion unit

+24 V

0 V

230 V AC

COM1

COM100

Ch0

Ch1

Ch100

Ch101

5355

If you use a power supply that meets safety standardsandonlyfeedsthePanelPC,

there is no problem. See 1 in drawing above.

However,ifyouhavea24Vunitthatalsofeedsotherunits,thereisreasontobe

cautious, see 2 in drawing above. The Panel PC does not have insulation that

meets safety requirements in the event of a potential short circuit between 230 V

AC and 24 V DC. It is assumed that the 24 V feed is secure, for example, SE LV

according to EN 60950 (protection against electric shock) and UL 950.

Example:

Hereisanexamplethatexplainswhyasecure24VDCfeedcanberuinedbymixing24

Vrelaycontactswith230VACrelaycontactsinasmallerc ontroller. Checkthatthe

“clearancesandcreepagedistancesbetween24VDCand230VACfulﬁllEN60950orUL

950”. Ifnot,inputaseparate24VunitintothePanelPC.

If there is a substant

ial distance between the relay contacts for 24 V DC and 230 V

AC, it is OK to use the

same 24 V devices for all feeds. See 3 in drawing above.

Connect 0 V on the 24 V feed to the ground, see 4 in drawing above. This offers

three advantages:

• Safety is increa

sed. The24Vfeedwillnotbeliveintheeventofafaulty

connection or s

hortcircuitbetween0V(24V)and230Vphase.

• Tr a n si e n t s on t

he 24 V feed are connected to the ground.

• No risk that th

e 24 V feed is at a high level in relationship to the ground. This

is not unusua

l since there is high static electricity.

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Beijer-electronics EPC TA70 AM EN Manual de usuario Pagina 28

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