Wiring - Honeywell UDC2300 Product Manual

2.6 Wiring

Electrical Considerations
The controller is considered "rack and panel mounted equipment" per EN61010-1, 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.
Mains Power Supply
This equipment is suitable for connection to 90 Vac to 264 Vac, 50/60 Hz, power supply
mains. It is the user's responsibility to provide a switch and non-time delay (North
America), quick-acting, high breaking capacity, Type F (Europe), 1/2A, 250V fuse(s), or
circuit-breaker, as part of the installation. The switch or circuit breaker shall be located in
close proximity to the controller, within easy reach of the OPERATOR. The switch or
circuit breaker shall be marked as the disconnecting device for the controller.
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
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, Table 2-6.
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 Permissible Wiring Bundling - Table 2-6) and route the individual bundles
through separate conduit 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.
For additional noise information, refer to Document #51-52-05-01, How to Apply Digital Instrumentation in
Severe Electrical Noise Environments.
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Installation
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