Watlow 12LS Controller - Manual (Page 18)

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3.1.2 EXTERNAL WIRING
During wiring, it is recommended that the 12LS electronics be removed or temporary covers be put over the housing
slots to ensure pieces of wire do not enter the housing and lodge in the electronics. Always ensure that the housing is
clean when the electronics is plugged in.
The successful installation of the ANAFAZE 12LS control system will be the result of selecting the proper equipment
and the use of correct installation techniques with appropriate material. One area of concern is the wiring type and
placement of the wiring.
The wiring is selected as to the function of the wire, the installation requirements, and the possible
mechanicalelectrical problems that may occur.
The function of the wire is divided into two basic categories: INPUTS and OUTPUTS. The process control
requirements will dictate the TYPE of INPUTS and the TYPE of OUTPUTS along with the mechanical electrical
requirements of the individual installation.
As defined by ANAFAZE, the term AC power is applied to the 120 VAC control supply. High power is applied to 240
VAC or higher, primarily used for control loads.
3.1.3 GENERAL WIRING REQUIREMENTS
1. Use stranded wire. Solid wire is recommended for fixed service and tend to make intermittent connections when
moving the field wiring around for maintenance.
2. Use 18 or 20 ga. size wire. The use of 16,18,20,22, or 24 ga.is permissible also. The power requirement is not a
factor in the wire size. Only the mechanical strength and the ohmage of the wire may be factors to consider.
Smaller or larger sizes are not easily installed, may be easily broken and/or cause intermittent connections.
3. Use shielded wire. The electrical shield is used primarily to protect from unwanted electrical noise.
Normal use of the INPUT WIRING SHIELD is to connect one end only to the 120 VAC panel ground at the 12LS
panel location.
Normal use of the OUTPUT WIRING SHIELD would be to connect one end only to the 120 VAC panel
ground in the panel that the 12LS is mounted in. Actual use of the shields will be determined by the
installation requirement.
For additional noise suppression measures see NOISE SUPPRESSION FOR Digital Outputs.