Control Unit Mains Supply Connections - Ametek Thermox CEM/O2 User Manual

3-14 | Thermox CEM/O2 Analyzer

Control Unit Mains Supply Connections

Do not run control unit AC mains supply wiring in the same conduit
with other AC line power wires. By keeping this wiring separated,
you prevent transient signals from reaching the control unit.
The Series 2000 control unit can operate using between 85 to 250 volts AC,
47 to 63 Hz. There is no power switch or circuit breaker on the control
unit, and it must be protected by installing it on a circuit-protected line,
maximum 15 amperes, with a switch or circuit breaker in close proximity
to the control unit and within easy reach of an operator. Mark the switch
or circuit breaker as the control unit disconnecting device.
Mains supply connections to the control unit are as follows:
Line - Line connection
Neutral - Neutral connection (USA)
Chassis Stud - Equipment ground (protective conductor)
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.