Electrical Considerations - Honeywell 7866 Operation And Maintenance Manual

Installation
3.6

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
2 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.
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
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 3-2.
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 3-2) 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.
ATTENTION
For additional noise information, refer to document number 51-52-05-01, How to Apply Digital
Instrumentation in Severe Electrical Noise Environments.
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