Allen-Bradley 1769-PA2 Installation Instructions Manual page 9

Power Supply Components (Continued)
Item Description
6 Nameplate label
7a Upper tongue-and-groove slots
7b Lower tongue-and-groove slots
8a Upper DIN rail latches
8b Lower DIN rail latches
9 Terminal block with fingersafe cover
10 Fuse housing cover for replaceable fuse
11 120V AC or 240V AC line input power selector switch (PA4 only)
12 Removable selector switch label (PA4 only)
Install an I/O Expansion Power Supply
Compact I/O Expansion Power Supplies are suitable for use in an industrial environment when
installed in accordance with these instructions. Specifically, this equipment is intended for use in
clean, dry environments (Pollution degree 2
(2)
Category II (IEC 60664-1).
Disconnect the Power
WARNING: Remove power before removing or inserting this power supply from the 1769 I/O
system. When you remove or insert a power supply with power applied, an electrical arc may
occur. An electrical arc can cause personal injury or property damage by:
• Sending an erroneous signal to your system's field devices, causing unintended machine
motion.
• Causing an explosion in a hazardous environment.
Electrical arcing causes excessive wear to contacts on both the power supply and its mating
connector. Worn contacts may create electrical resistance.
(1) Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that occasionally a temporary conductivity that
is caused by condensation can be expected.
(2) Over Voltage Category II is the load level section of the electrical distribution system. At this level, transient voltages are controlled and do not
exceed the impulse voltage capability of the insulation of the product.
(3) Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC) designations.
Rockwell Automation Publication 1769-IN028C-EN-P - August 2016
(1)
) and to circuits that do not exceed Over Voltage
(3)
Compact I/O Expansion Power Supplies
9