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2.7 Wiring
Line voltage wiring
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.
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 insullation 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.
Terminal Block Style
The terminal block is available in the barrier style, shown in Fig.2.6.1.
z Screw : M3.5
z Wire No. : #16 to 14AWG
Wiring Rules and Recommendations
In general, stranded copper wire should be used for non-thermocouple electrical connections.
Twisted-pair wiring with shielded cable will improve noise immunity if wire routing is suspect.
Wire Gage
Observe all local codes when making power connections. Unless local electrical codes
dictate other wire, the recommended minimum wire size for connections is given in Table
2.7.1.
Table 2.7.1 Minimum Recommended Wire Sizes
Wire Gauge Wire Application
14 to 16 AC to power supply
10 to 14 Earth ground wire
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