• Apower line filter installed at the AC input to the OIT power supply is highly
recommendedas a safeguard against conducted RF noise, which is often present
onfactory power lines. Thewiresconnecting the output of the power line filter
to the power supply should be kept as short as possible to minimize any
additionalnoise pickup. Thecase of the power line filter should be connected to
aquiet earth ground. Thepower line filter should have a current rating of at least
threeamps with common mode and differential mode attenuation.
• Thepower supply that provides power to the OIT should not be used to power
switchingrelays or solenoids unless noise filter caps are connected to each relay.
1.3. OIT Cable Routing• Always route the OIT operating cable away from any AC voltage or host
controllerwires.
• Neverbundle the OIT cables together with 120 VAC power wires or with relay
wiring.
• Tryto keep at least 8 inches (20 cm) of separation between the OIT cables and
other power wiring. If voltages greater than 120 VAC are used in the system,
greaterseparation is required.
• Ifthe OIT cables must come near AC wiring, make sure they cross at 90 degrees.
• RunningAC power wires in a separate grounded conduit is the preferred method
forelectrical noise reduction.
• Keepthe lengths of the OIT cables as short as possible. Donot coil excess cable
andplace it next to AC powered equipment.
1.4. Other Steps to Improve Noise Immunity• Always install the OIT’s rear cover. This provides a shield against electrical
noisewhich can be generated in the control panel by relays, motors, power lines,
and/or high frequency equipment. Ensurethat all rear cover mounting screws
areproperly secured.
• Any equipment used in the enclosure that operates at high frequency or high
currentlevels can be covered with a grounded metal shield.
6 MAP450D
1010-0046A,REV 00
AC
AC
GND
N
L
WHITE
BLACK
N
L
GAC
LINE FILTER
GREEN
WHITE TO
110VAC NEUTRAL
BLACK TO
110VAC LOAD(HOT)
TO EARTH
"QUIET" GROUND POWER SUPPLY
GROUND
KEEP SHORT
Figure2 Power Line Filter Connection