Good Wiring Practices

CN 2110 Temperature Controller

Separate wire into bundles—When planning the system wiring, separate wiring into functionally similar bundles, e.g.

•Power leads

•Sensor leads (if power leads must cross sensor leads, they should cross at a 90° angle)

•Output signal lines

Separate sources of electrical noise—Locate all sources of electrical noise in your system, and separate these sources from the control system, e.g.

•Motors

•Contacts

•Solenoids

Electrical noise can affect the function of any control system. When driving a contactor coil or other inductive load, an appropriate rated AC snubber circuit is recommended (Omega Part No. CNQUENCHARC).

Connect before power is applied—Make all electrical wiring connec- tions to the back of the controller before power is applied to the unit.

Comply with regulations—WARNING: All wiring practices must comply with local regulations. Failure to do so could result in damage to controller and/or personal injury or death from electrical shock.

This instrument is intended for panel mounting and the terminals must be enclosed within a panel. Use National Electric Code (NEC) Class 1 wiring for all terminals except the sensor terminals.

Check wiring decal—Check the wiring decal on the side of the unit to verify the model number. The wiring decal shows the wiring termina- tions. All wiring will be connected to the terminals on the back of the instrument case. Specific wiring instructions for different input and output types are given in this section. See also Figure 3.5.

Additional information—For sensor wiring practices, see “Sensor Input Wiring”. For additional information on good wiring practice, request IEEE Standard No. 518-1982 from IEEE, 345 East 47th St., New York, NY 10017 or www.ieee.org.

Sensor Input	Alarm Wiring
Wiring	COM NO NC
Wiring

	Output	Instrument
	Wiring	Power Wiring
	(T5, T10)
	Figure 3.5	Output Wiring
	Figure 3.5	(R1, R20, DC, or T1)
	Wiring Terminal Identification	(R1, R20, DC, or T1)
	Wiring Terminal Identification

Section 3–Installation and Wiring

CN 2110