ETC Unison ERn Rack-mount Control Enclosure - Manual (Page 32)

28 Unison ® ERn Rack Mount Enclosure Installation Manual
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 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 ERn4 enclosures at
230 VAC. Instead the 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 as standard.
Install the redundant rack power supply in the bottom option
module slot of the ERn enclosure and secure it in place with the
two captured screws.