Page 3
Wiring and connections
¨
Segregate power supply and signal
wiring.
¨
Use screened cable for all signal wiring
with the screen earthed at
one
end
only.
¨
All connections should be made using
ferrules.
¨
Screw terminals are provided with a
maximum wire of capacity 2.5mm
2
.
Access to Terminals
WARNING:
Ensure that power to the
instrument is switched off and signal
wiring isolated from hazardous voltages
Each set of screw terminals, top and
bottom, is covered by a captive white
plastic shield. These many be unclipped
to gain access to the terminal screws.
Power supply and output connections are
provided on the top of the module. Input
connections are provided at the bottom of
the module.
Power supply connections
WARNING:
Check that the supply
voltage on the data label (on side of
instrument) is suitable for the
application.
WARNING:
Ferrules should be used for
power supply wiring
The COM-3B may be powered from a DC
supply in the range 11-32 VDC, 1.6W.
This unit is protected by an internal
thermal self-resetting fuse.
Power supply wiring to the instrument
should be protected by a suitable fuse
and double pole switch - see Power
supply connections diagram. The switch
should be clearly marked as the isolating
switch for the instrument.
Power supply connections
Supply
11 - 32 VDC
Screw terminals
may be
unplugged
from the module.
Unclip and pull on
the white plastic
terminal shields.
--
+
2
1
11-32VDC
4
3
