Rockwell Automation 1797-PS2N2 FLEX Ex Power Supply - Manual (Page 7)

FLEX Ex Power Supply 7
Publication 1797-5.12 - June 2010
Mount the 1797-PS2N2 Power Supply
Follow these directions to properly install the 1797-PS2N2 power supply.
The 1797-PS2N2 power supplies provide pre-tapped 1 in. NPT (National
Pipe Thread) conduit entrance and exit holes. Depending on your local
requirements, the hazardous conduit entrance could be through hard conduit
or semi-flexible continuous conduit with poured seals, from the safe area.
Similarly, the IS power exit could be through poured seals, for example. The
power supply output wires are IS and require only normal IS treatment once
they are sealed at the power supply exit.
1. Unscrew the cover of the power supply to access the input and output
terminals.
2. Thread the blue IS-safe output power wiring through the IS power
exit seal.
3. Connect the blue IS-safe output power wiring to the output terminals
making sure all connections are tight.
These power supply outputs provide the input power to the FLEX Ex
modules.
4. Thread the hazardous incoming power wiring through the conduit,
and the hazardous power entrance seal.
5. Connect the hazardous incoming power wiring to the input terminals
making sure all connections are tight.
ATTENTION
 Conduit seals must be installed at the entry of the enclosure (FM) or
within 150 mm (6 in.) of the enclosure (UL).
 Use star washers and nuts to make sure you have a good electrical
connection. Scrape the paint off the back panel in those areas where
grounding bolts will be located.
 Once power has been applied, wait 15 minutes after disconnecting
before opening the cover.