Rockwell Automation 1769-PB4 Compact I/O Expansion Power Supplies - Manuel (Page 8)

8 Compact I/O Expansion Power Supplies
Publication 1769-IN028B-EN-P - October 2008
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
(1) ) and to circuits not exceeding Over
Voltage Category II (2) (IEC 60664-1). (3)
Disconnect the Power
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 finger-safe 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)
(1) Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that occasionally a
temporary conductivity caused by condensation shall 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 product’s insulation.
(3) Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC) designations.
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.
Item Description