9
INM4500-2
Mar 2009
5.1.5 Ambient temperature considerations
Ambient temperature limits for unenclosed MTL4500 Series isolators are from –20°C to +60°C with units
close-packed.
5.2 Modules
-
installation
5.2.1 Signal conductors
Removable blue hazardous area signal plugs, located on the front of the modules, are mechanically
keyed to fi t in only one position and are fi tted with screw clamp terminals. Note that the conductors
should be between 14 and 24 AWG (1.6 and 0.5mm dia) in size.
5.2.2 Making connections
Trim back the insulation of conductors by 12mm.
Check the terminal assignments shown in section 6 or on
the side label of the unit.
Insert conductors according to the terminal assignments
and tighten screws.
Note
: Smaller section wire than that stated can often be successfully
used if the crimping is good.
5.2.3 Finishing
Wire up individual isolators in accordance with wiring
schedules. Segregate hazardous- and safe-area wiring into
separate trunking or looms wherever possible to avoid errors
and maintain a tidy installation.
Use an MTL4599 dummy isolator to provide termination and
earthing for unused cores from the hazardous area.
5.2.4 Module mounting and removal
Check for the correct orientation of the module then locate it between the latching clips. Press the
module straight onto the backplane. See Figure 5.3.
To remove the module, unclip the latch nearest the CE mark shown on the module label and rotate
the module away from this latch. When the module is unplugged from the power connector, move
the module clear of the other latch and remove it. See Figure 5.4.
a)
b)
c)
14mm
12mm
Figure 5.3:
Mounting a module
onto a backplane
Figure 5.2:
Hazardous-area
plug
Figure 5.4:
Removing a module
from a backplane