Lightronics RA121 - Manual (Page 5)

Page 5 of 20
RA – 121 RACK MOUNT ARCHITECTURAL DIMMER
Revision 0.93 OWNERS MANUAL 09/26/2011
www.lightronics.com
Lightronics Inc. 509 Central Drive Virginia Beach, VA 23454 Tel 757 486 3588
SINGLE PHASE POWER CONNECTIONS
REQUIREMENTS
The RA-121 can operate as a single phase unit using
using only 2 phases of a 3 phase power source. This
is NOT RECOMMENDED since it causes an
unbalanced load to the power source.
The unit should be connected to two hot lines which
are NOT the same phase.
The feed circuit must be able to supply 60 Amps for
each line.
CONNECTIONS
There are three terminals on the input terminal power
block (H1, H2, H3). When operating the RA-121 on
single phase power, the center (H2) terminal is not
used. The wires connected to the left side of the H2
terminal contain color coded sleeves (RED and
BLACK). These wires must be moved and distributed
to the H1 and H2 terminals. Remove the wires from
the H2 terminal and connect them to H1 and H2 such
that the sleeve color matches the wire colors on H1
and H2.
Connect the feed neutral to the NEUTRAL bus bar.
Connect the feed ground t
o the GROUND lug.
See the section SYSTEM POWER SETUP for
operation using single phase connections.
POWER IN
SINGLE PHASE 120/240 VAC
BLACK
RED
BLUE
BLUE
RED
MARKER
BLACK
MARKER H1
H3
H2
NEUTRAL
GROUND
REAR OF RA-121
H2
NOT
USED
SINGLE PHASE POWER CONNECTIONS
WARNING
MAKE CERTAIN POWER IS REMOVED
FROM THE FEED CIRCUITS
BEFORE YOU BEGIN INSTALLATION.