50
Controller Grounding
PROTECTIVE BONDING (grounding) of this controller and the
enclosure in which it is installed shall be in accordance with National
and Local electrical codes. To minimize electrical noise and
transients that may adversely affect the system, supplementary
bonding of the controller enclosure to a local ground, using a 14AWG
~ 20AWG copper conductor, is recommended.
Control/Alarm Circuit Wiring
The insulation of wires connected to the Control/Alarm terminals
shall be rated for the highest voltage involved. Extra Low Voltage
(ELV) wiring (input, current output, and low voltage Control/Alarm
circuits) shall be separated from HAZARDOUS LIVE (>30 Vac, 42.4
Vpeak, or 60 Vdc) wiring per Permissible Wiring Bundling. See the
table Permissible Wiring Bundling for more information.
Electrical Noise Precautions
Electrical noise is composed of unabated electrical signals which
produce undesirable effects in measurements and control circuits.
Digital equipment is especially sensitive to the effects of electrical
noise. Your controller has built-in circuits to reduce the effect of
electrical noise from various sources. If there is a need to further
reduce these effects:
n
Separate External Wiring—Separate connecting wires into bundles
(See the table Permissible Wiring Bundling) and route the
individual bundles through separate conduit metal trays.
n
Use Suppression Devices —For additional noise protection, you
may want to add suppression devices at the external source.
Appropriate suppression devices are commercially available.
ATTENTION: For additional noise information, refer to
document number 51-52-05-01, How to Apply Digital
Instrumentation in Severe Electrical Noise Environments.
Chapter 3 - Installation
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