maxPAC Input/Output Subsystem
Metso Automation MAX Controls Inc.
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277596
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1-9
To make sure all chassis assembly mounting screw cutouts line up to
corresponding mounting rail holes, you must align the top mounting
screw cutouts (left and right) of the chassis assembly with the top holes
(left and right) of two hole pair.
3.
Position the chassis assembly (two ribbon connectors to the right) so that
the screw slots align with the nut retainers. Insert eight 10-32 mounting
screws (MAX Part No. 030162) and tighten securely.
Cabling, power wiring, and chassis assembly to cabinet frame grounding
should be completed before mounting the I/O modules. See next section.
Cabling, Power, and Ground Wiring
This section describes power wiring, Model IOP I/O connection, and
connection to other Model IOP I/O units. The connections covered in this
section should be done after the chassis assemblies are in place and before
the I/O modules are mounted. Some cabling can be done when the I/O
modules are mounted, but the job is easier when they are removed. (See also
Interconnecting Adjacent I/O Chassis).
Cables used in the maxDNA Distributed Control Systems are labeled at both
ends with the device and connector number. Interconnecting ribbon cables
are designed for specific orientation, however, the connectors still prohibit
wrong electrical connection.
Refer to Publication 277561,
System Power and Grounding
, for a discussion
of cabinet grounding.
Supplying 24V Power to the I/O Modules
The I/O system requires a 24 Vdc ±4.0 Vdc power supply. Normally, this is a
maxDNA power supply mounted in the cabinet holding the DPU; to ensure
reliability, Metso Automation MAX Controls recommends using a maxDNA
power supply exclusively. If another 24 Vdc power supply is used, it must
meet the same specification requirements as the maxDNA supply. All
modules are individually fused. The CMOS technology in the Model IOP I/O
design results in low module power consumption.
Whether the power source is the standard maxDNA supply or another
supply, the +24 Volts connector plugs into the 24V connector on the right
side of the I/O backplane.
Caution
: The +24 Vdc power supply used to power any maxDNA hardware
should never be used for external relay contact wetting or to power any other
field equipment. Use a separate supply for contact wetting to provide noise
and interference protection for the maxDNA hardware.
