Lightronics RA121 - Manual (Page 4)

Page 4 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
THREE PHASE POWER CONNECTIONS
REQUIREMENTS
True 120/208VAC three phase power must be supplied
to operate the RA-121 in the 3 phase configuration.
This means that the voltage across any two lines must
be 208 VAC. All three phases must be supplied. The
feed circuit must be able to supply 40 Amps for each
hot line.
THE UNIT WILL NOT OPERATE IN IT'S THREE
PHASE CONFIGURATION USING ONLY 2 LINES
OF A 3 PHASE 120/208 VAC SUPPLY CIRCUIT.
CONNECTIONS
Connect the 3 in hot feed lines to the 3 terminals on the
input power terminal block (H1, H2, H3).
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 3 phase connections.
POWER IN
3 PHASE 120/208VAC
BLACK
RED
BLUE
BLUE
RED
MARKER
BLACK
MARKER
H1
H3
H2
NEUTRAL
GROUND
REAR OF RA-121
THREE PHASE POWER CONNECTIONS
WARNING
MAKE CERTAIN POWER IS REMOVED
FROM THE FEED CIRCUITS
BEFORE YOU BEGIN INSTALLATION.