Lightronics RE121D - Manual (Page 2)

Page 2 of 8
RE - 121 RACK MOUNT DIMMER
Revision 2.1
OWNERS MANUAL 11/29/2007
www.lightronics.com
Lightronics 509 Central Drive, Virginia Beach, VA 23454 (757) 486-3588
DESCRIPTION
The RE-121 is a 12 channel dimmer with a capacity of 1,200 watts per channel giving a total of 14,400 watts. The
RE-121 is controlled by a lighting control console. The unit can be supplied to use either the DMX-512 control
protocol or the LMX-128 control protocol. Channels A - F and/or channels G - L may be switched to operate in
"relay" mode. In relay mode, channels may be switched only to either to full on or full off depending on fader
position .
POWER REQUIREMENTS
Each RE-121 requires BOTH PHASES of a SINGLE PHASE 120/240 VOLT AC service or TWO PHASES OF A
THREE PHASE 120/208 VOLT AC service. The neutral conductor is shared by two hots so it is important that the
two hots used are of different phases. EACH PHASE must be capable of providing 60 AMPS. Line frequency can
be either 50 or 60HZ. One or more RE-121 dimmers are to be installed into a standard 19" equipment rack with
provisions for connection to an appropriate electrical service in accordance with the National Electrical Code.
LIGHTING LOAD CAPACITY
Each RE-121 channel has a 1200 Watt MAXIMUM rating and is protected by a fast acting 10 Amp fuse. 10 Amps
equates to 1200 Watts at 120VAC. If you operate a channel at 1200 watts then you are very close to blowing the
fuse. This will occur if AC line voltages are high or you have power surges. Other conditions which may cause
the fuse to blow include turning a cold lamp quickly on to full intensity. A maximum practical load of 1000 Watts
per channel will allow for some overhead and help prevent breaker tripping.
INSTALLATION
PLACEMENT
The RE-121 is designed to be mounted in a standard 19" equipment rack using the four mounting holes in the
face plate. If the dimming system will be used for touring shows, it is recommended that you provide additional
support for the rear of the unit. The dimmer is fan cooled and requires no space between units when multiple
dimmers are used together in a rack. . Air enters the dimmer through slots on the side and exits through holes in
the bottom of the face plate. Make certain these ventilation holes are not obstructed. Do not place the RE-121
where it will be exposed to moisture or excessive heat. The RE-121 is intended for indoor use only.
RE-121 CONTROL PANEL