ETC Unison ERn Wall-mount Control Enclosure - Manual (Page 39)

5
Install Rack Options 35
Install Redundant Power Supply
The ERn Redundant Power Supply (ERn-RPS) is an additional rack power supply that
powers the ERn enclosure if the primary rack power supply is removed or fails.
Status Indicator
When the Redundant Power Supply is installed properly, and power is applied to the ERn
enclosure, the LED will indicate in green if the supply is powered. If the LED is off but the
primary rack supply status indicator is on, the Redundant Power Supply requires servicing.
Alternatively, if the primary rack supply status LED is off, but the Redundant Power Supply
is on, the primary rack supply requires service. Contact ETC Technical Services for
assistance. See “Contacting ETC” on page 4.
N o t e : The Redundant Power Supply (ERn-RPS) is not supported in an ERn4 rack
enclosure at 230 VAC. Instead, the ERn4 rack at 230 VAC requires two rack
power supplies installed in the top (normal) position and in the lower rack option
module slot as standard.
Install the Redundant Rack Power Supply in the bottom
option slot of the ERn enclosure and secure it in place
with the two captured screws.