Watlow MLS - Manual (Page 28)

16 MLS User’s Guide
Installation
Read This Before Installation
WARNING
During installation and wiring, place temporary
covers over the housing slots and the rear of the
MLS so dirt and pieces of wire don't fall through
the slots. When you are finished with installation,
remove the covers.
Install the MLS so the airflow to the slots in the
housing is not restricted after installation. Make
sure that other equipment does not block airflow
to the housing slots.
Use #18 or #20 AWG wires and trim wire insula-
tion to 1/4" (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 cables to reduce
strain on the terminals and to prevent wire
removal.
DANGER
Shut off power to your process before you install
the MLS. High voltage may be present even when
power is turned off! Reduce the danger of electric
shock after installation--mount the MLS in an
enclosure that prevents personal contact with elec-
trical components.
The MLS measures input signals that are not nor-
mally referenced to ground, so the MLS 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.
NOTE
Choose a panel location that leaves enough clear-
ance to install and remove the MLS and its
components.