Watlow CAS - Manual (Page 18)

8 CAS User’s Guide
Installation
Precautions and Warnings
DANGER
Shut off power to your process before you install the CAS. High
voltage may be present even when power is turned off! Reduce
the danger of electric shock after installation, mount the CAS in
an enclosure that prevents personal contact with electrical com-
ponents.
The CAS measures input signals that are not normally refer-
enced to ground, so the CAS inputs and other signal lines can
have high voltage present even when power is turned off. For
example, if you inadvertently short a thermocouple to the AC
power line.
WARNING
During installation and wiring, place temporary covers over the
housing slots and the rear of the CAS so dirt, pieces of wire, et
cetera don't fall through the slots. Remove these covers after
installation.
Install the CAS so the housing slots receive unrestricted airflow
after installation. Make sure that other equipment does not
block airflow to the slots.
Use #20 or #22 AWG wires and trim wire insulation to ¼" or 5
mm. Wire should fit inside the terminal with no bare wire
exposed, to prevent contact between wires and the grounded
case. Tin any stranded wire.
Support power, input and output wires to reduce strain on the
terminals and to prevent wire removal.
NOTE
Choose a panel location that leaves enough clearance to install and
remove the CAS and its components.