Instruction Manual

Page 2 of 9
DB - 612 LIGHTBAR DIMMER
Version: 0.6 OWNERS MANUAL 01/20/2005
www.lightronics.com
Lightronics Inc 509 Central Drive Virginia Beach, VA 23454 Tel [phone]
DESCRIPTION OF UNIT
The DB-612 is a 6 channel dimmer with a capacity of 1,200 watts per channel giving a total of 7200 watts. The
DB-612 is controlled by a control console using the USITT DMX-512 lighting control protocol. Individual channels
may be set to operate in "relay" mode where channels are switched only on or off depending on console fader
position.
LOCATION AND ORIENTATION
THE UNIT SHOULD BE OPERATED HORIZONTALLY WITH THE OPERATOR PANEL FACING FORWARD OR
BACKWARD (NOT UP OR DOWN).
Make certain the ventilation holes on the face of the unit are not obstructed. A six inch clearance should be
maintained between the unit and other surfaces to ensure proper cooling. Do not place the DB-612 where it will
be exposed to moisture or excessive heat. The DB-612 is intended for indoor use only.
MOUNTING
The DB-612 is designed to be mounted on truss equipment using standard lighting pipe clamps. The attaching
bolt for these clamps will fit in into an inverted "T" slot located along the bottom of the dimmer. The slot will also
accommodate a 1/2" bolt (3/4" across bolt head flats). Use a pipe clamp to mount the DB-612 above a truss bar.
MOUNTING ADAPTERS
The DB-612 is supplied with three mounting adapters and their associated hardware. The primary purpose of the
adapters is to provide a way to install the unit below a truss bar without turning it upside down. The adapters can
also be used for other user defined mounting arrangements.
TO INSTALL THE MOUNTING ADAPTERS
1. Install a pipe clamp on the end of the adapter which overlaps itself. Make the clamp snug but not tight
against the adapter so you can make final adjustments when installing the unit on a bar.
2. Install 1/2" bolt and flat washer through the other end of the adapter so that the bolt head and washer are
inside the adapter.
3. Slide the adapter (with the 1/2" bolt and flat washer installed) on either end of the DB-612 so that the bolt
head slides into the DB-612 "T" slot. The flat washer must be between the DB-612 and the adapter.
4. Install a lock washer and nut on the 1/2" bolt. Leave it loose enough to slide the adapter along the "T" slot
in the DB-612.
5. Slide the adapter along the DB-612 "T" slot to the desired position and tighten the nut until it is snug. You
may not want to completely tighten the nuts so you can make final adjustments when you hang the unit.
An illustration of the adapter installation appears on the following page.
6. Repeat the above process for the remaining adapters.
7. Hang the entire assembly on a truss bar by the pipe clamps. Tighten down any connections left loose
during the previous assembly process.
NOTE: Use of safety chains or cables is recommended for any overhead dimmer installation