4. Installation
l
The SDM-CD16ACA must be installed in an enclosure that provides a pollution degree 2
environment (normally, only nonconductive pollution; however, a temporary conductivity
caused by condensation may be expected). All Campbell Scientific enclosures meet this
requirement.
l
Use copper conductors only.
l
Wire Range: 30 to 14 AWG
l
Tightening Torque: 5 to 7 in/lb
l
Use minimum 60/75 °C wire.
l
Input power must be connected to a class 2 supply only. All Campbell Scientific power
supplies meet the class 2 supply requirements.
CAUTION:
Cables connecting the data logger and SDM device should be kept as short as possible to
minimize the risk of corruption of the signals and damage from induced surges. Where long
cable runs (>3 m) are unavoidable and the cables run outside, some extra protection may be
required for the SDM control ports. Please contact Campbell Scientific for further advice.
When connecting wires to the SDM signal ports, please ensure they are at ground potential
before making the connection by touching them to the earth terminal.
For
data
logger
connections,
see
5).
Multiple
SDM-CD16ACAs
may
be
wired
in
parallel
by
connecting
the
data
logger
side
of
one
SDM-CD16ACA
to
the
next.
The
CABLE5CBL-L
or
an
equivalent
cable
is
used
to
connect
the
module
to
the
data
logger.
A
0.3 m
(1 ft)
cable
length
should
be
sufficient
when
both
data
logger
and
SDM-CD16ACA
are
housed
within
an
ENC12/14;
a
0.6 m
(2 ft)
length
may
be
required
if
the
data
logger
and
SDM-CD16ACA
are
housed
at
opposite
ends
of
an
EN
C
16/18
enclosure.
CRBasic
data
loggers
should
use
the
SDMSpeed()
instruction
if
the
cable
length
is
longer
than
6 m
(20 ft).
NOTE:
SDM cables in noisy environments need to be suitably shielded.
SDM-CD16ACA 16 Channel AC/DC Controller
4
