4.
Electrical connections
4.1.
General instructions
• It is for bid den to plug or un plug ter mi nals with vol ta ge ap plied.
• At tach in put and out put wi res to ter mi nals only wit hout vol ta ges ap -
plied.
• Cords must be pro vi ded with slee ves.
• At ten ti on must be paid that the po wer supp ly vol ta ge ap plied will
agree with the vol ta ge no ti ced at the name pla te.
• The in stru ment has no po wer-on switch. So it will be in ope ra ti on as
soon as the po wer supp ly vol ta ge is con nec ted.
4.2.
Hints against noisy environment
All in puts and out puts are pro tec ted against noi sy en vi ron ment and high vol ta ge spi -
kes. Ne ver the less the lo ca ti on should be se lec ted to en su re that no ca pa ci ti ve or in -
duc ti ve in ter fer en ce can have an ef fect on the in stru ment or con nec ti on li nes.
It is ad vi sa ble:
• To use shiel ded ca bles.
• The wi ring of shields and groung (0V) should be star-sha ped.
• The dis tan ce to in ter fer en ce sour ces should be as far as pos si ble. If
ne ces sa ry, pro tec ti ve screen or me tal en clo su res must be pro vi -
ded.
• Coils of re lays must be supp lied with fil ters.
• Par al lel wi ring of in put out put li nes to any AC po wer li nes should be
avoi ded.
• The li nes should be as short as pos si ble.
• It is ad vi sa ble to use shiel ded twis ted pair ca ble for in put and out put
li nes.
ERMA-Electronic GmbH
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4. Electrical connections