Filter
Top Products
4/00 UDC 3300 Controller Product Manual 15
2.4 Wiring
Electrical
considerations
The controller is considered “rack and panel mounted equipment” per
EN 61010-1, Safety Requirements for Electrical Equipment for
Measurement, Control, and Laboratory Use, Part 1: General
Requirements. Conformity with 72/23/EEC, the Low Voltage Directive
requires the user to provide adequate protection against a shock hazard.
The user shall install this controller in an enclosure that limits
OPERATOR access to the rear terminals.
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 No. 12 (4 mm
2
) 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 Table 2-3.
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:
• Separate External Wiring - separate connecting wires into bundles (see
Table 2-3) and route the individual bundles through separate conduits
or metal trays.
• 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.