External 24Vdc Power Supply
MX 32 should be powered by either a certified (by CSA/UL
depending on the country of installation) Class 2 power supply or a
certified Limited Energy power supply in accordance with CSA
61010-1-12 or UL 61010-1 or IEC 61010-1 standards (depending
on the country of installation).
In this case, connect the 24Vdc power supply to the corresponding terminal
(Figure 23, A). This terminal is protected by a 4A fuse located below terminal
tag A.
Figure 23: Connection of 24Vdc external power supply (A)
Grounding
The MX 32 meets EMC and Low Voltage Directives requirements. In order to
fully comply with the class of protection, it is absolutely necessary to connect
the ground terminal to the Earth of the site (Figure 24, A). Moreover, the cable
braids of the digital and analog lines shall also be connected to this ground
terminal.
Figure 24: Ground and braid connection
Digital lines
The cabling of the digital lines connecting the controller to the different
modules deployed along the lines are the subject of the paragraphs OLCT
10N Modules, 4- or 8-relay modules, 16-logic input modules, 8-analog input
modules and 4-analog output modules of this same chapter. It should be
remembered that this cable comes in 2 twisted pairs of 4 x 0.22 m² minimum,
type MPI-22A, nominal impedance of 100 Ohms.
Analog or Wheatstone lines
For an analog 4-20mA detector connected directly to the MX 32 line, please
wire the detector as shown below.
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