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04/08 UDC3200 Universal Digital Controller Operator Manual 9
2.5 Wiring
2.5.1 Electrical Considerations
Line voltage wiring
This 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 to 264 Vac or to 24 Vac/dc 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 for 90-264 Vac applications; or 1 A, 125 V fuse or
circuit breaker for 24 Vac/dc applications, 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.
CAUTION
Applying 90-264 Vac to an instrument rated for 24 Vac/dc will
severely damage the instrument and is a fire and smoke hazard.
When applying power to multiple instruments, make certain that sufficient current is
supplied. Otherwise, the instruments may not start up normally due to the voltage
drop caused by the in-rush current.
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 Permissible Wiring Bundling,
Table
2-4.
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: