Watlow CAS200 - Manual (Page 27)

CAS200 User’s Guide Chapter 2: Installation
Watlow Anafaze 15
ç
CAUTION! Do not wire bundles of low-voltage signal and
control circuits next to bundles of high-voltage ac
wiring. High voltage may be inductively coupled
onto the low-voltage circuits, which may damage
the scanner or induce noise and cause poor
control.
Physically separate high-voltage circuits from
low-voltage circuits and from CAS200 hardware.
If possible, install high-voltage ac power circuits
in a separate panel.
Wiring Recommendations
Follow these guidelines for selecting wires and cables:
• Use stranded wire. (Solid wire can be used for fixed
service; it makes intermittent connections when you
move it for maintenance.)
• Use 20 AWG (0.5 mm 2 ) thermocouple extension wire.
Larger or smaller sizes may be difficult to install, may
break easily, or may cause intermittent connections.
• Use shielded wire. The electrical shield protects the
signals and the CAS200 from electrical noise. Connect
one end of the input and output wiring shield to earth
ground.
• Use copper wire for all connections other than
thermocouple sensor inputs.