ETC Unison ERn Wall-mount Control Enclosure - Manual (Page 17)

2
Install Rack Enclosures 13
Rough-in Conduit and Wiring
Remove Option Modules
Prior to installing conduit and pulling wires into the ERn enclosure, remove the rack power
Supply (top of enclosure) and blank option module (bottom of enclosure) from the ERn
enclosure to provide a clear access to the conduit access openings and connections.
Step 1: Loosen the two captured thumbscrews that secure the Rack Power Supply to the
ERn enclosure.
Step 2: Pull the power supply straight out of the rack.
Step 3: Repeat for the blank option module, Ethernet Switch or secondary power supply.
Step 4: Place these modules in a safe place until the conduit rough-in and wiring
terminations are complete.
W A R N I N G : All rack terminations must be done with the power off. Racks installed
without an accessible power disconnect device cannot be serviced or
operated safely. Follow all local codes and restrictions.
When the disconnect device is not located near the installed rack enclosure,
the disconnect should allow for proper lockout / tagout. See “Lockout /
Tagout” on page 6.
N o t e : For 230 VAC CE enclosures, before removing any modules, loosen the hardware
and slide the module retention bar to the left.
N o t e : An ERn4 at 230 VAC does not support the Redundant Rack Power Supply (ERn-
RPS) nor the Ethernet Switch Option Module (ERn-NET). Instead an ERn4 at 230
VAC is shipped from the factory with a Rack Power Supply installed in the top
(normal) position and in the lower option module slot.
Rack power supply (ERn-PS)
The blank option module installed
at shipment can be replaced with
either the Ethernet Switch Module
(ERn-NET) or the Redundant
Power Supply (ERn-RPS).