Ametek Thermox WDG Insitu, Руководство пользователя

Страница: 39 / 166

Installation and Start-Up | 3-15
or NEUTRAL connection for any function, safety or otherwise. The (N) terminal
is not internally grounded, nor needs to be. The system will operate normally re-
gardless of what AC input terminal (L or N) the AC Line or Neutral is connected
to, or, if there is a Neutral used at all (i.e., 208 VAC US power connection).
EMC grounding, shielding, and noise protection
For EMC purposes, under no circumstances should you leave cable
shields disconnected at one end or both ends of the cable (sensor or
control unit or other device).
You must use twisted-pair cable in rigid metal conduit or use twisted pair cable
with an overall braided shield. All cable shields or conduits connecting to the
control unit must be chassis grounded.
EMC grounding method
•
Shield Ring Method
Connect all shields for that conduit entry (other than power) to a supplied
shield terminal ring (see Figure 3-25). This shield ring is a stainless steel
ring with a metal tab. Place the shield ring under the conduit nut. Crimp the
shields from all cables for that conduit entry to a 1/4” female quick discon -
nect, then push it onto the tab that sticks out of the conduit shield ring. Keep
shields as short as possible.
•
Ground Stud Method
Connect all cable shields for that conduit entry to the grounding stud closest
to that conduit entry hole.