Ametek Thermox Series 2000 WDG-IV User Manual page 54

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3-22 | Thermox Series 2000 WDG-IV / IVC / IVCM
Use the 1/2" conduit entry hole in the control unit for AC mains supply
wiring. Use the chassis stud next to the 1/2" conduit entry hole for equip-
ment ground (protective conductor).
AC (L) and (N) markings are provided by the terminal block for connec-
tion of AC power. These markings are for reference purposes only, such as
for use on system wiring diagrams, etc. The system/product has or needs
no specific LINE or NEUTRAL connection for any function, safety or oth-
erwise. The (N) terminal is not internally grounded, nor needs to be. The
system will operate normally regardless 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 connect-
ing 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 sup-
plied shield terminal ring (see Figure 3-25). This shield ring is a stain-
less 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 disconnect, 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.