RD - 121 RACK MOUNT DIMMER OWNERS MANUAL REVISION 1.2 02/28/2005 www.lightronics.com Lightronics Inc.
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Page 3 of 13 RD - 121 RACK MOUNT DIMMER OWNERS MANUAL Version 1.2 02/28/2005 UNIT DESCRIPTION AND FUNCTIONS The RD-121 is a 14,400 Watt, 12 channel, rack mountable lighting dimmer. Each of the channels has a capacity of 1200 Watts. It is controlled via low voltage signals which may be LMX-128 (3 wire multiplex), or USITT DMX512. The unit is fan cooled. Channels may be independently assigned from the unit.
Page 4 of 13 RD - 121 RACK MOUNT DIMMER OWNERS MANUAL Version 1.2 02/28/2005 OUTPUT CHANNEL CONNECTIONS The RD-121 can be supplied with one of several rear panel output options. Channel output connections are according to the the rear panel selected. Channel connections generally proceed from left to right (if you are facing the rear of the unit). Channel “A” will be on the left end. Connections for load Neutrals are provided.
Page 5 of 13 RD - 121 RACK MOUNT DIMMER Version 1.2 OWNERS MANUAL 02/28/2005 RESETTING THE UNIT The RD-121 may be reset to a "factory provided" configuration by holding down the MENU button on the front panel for about 5 seconds. A message "SYSTEM RESET" will appear on the front panel LCD display. Release the MENU button when you see the message. Resetting the unit causes the following actions: 1. 2. 3. 4. 5. 6. Channel patch is set to 1 to 1. All channels are set to to DIM (relay mode turned off).
Page 6 of 13 RD - 121 RACK MOUNT DIMMER OWNERS MANUAL Version 1.2 02/28/2005 NORMAL OPERATION As you operate faders on your console the associated channel levels are indicated on the RD-121 display. The display will also indicate any abnormal conditions such as over temperature or over voltage. The fan will run at full speed whenever there is a control signal present and one or more faders are at full on.
Page 7 of 13 RD - 121 RACK MOUNT DIMMER OWNERS MANUAL Version 1.2 02/28/2005 NOTES ABOUT INTERNAL SCENE: The RD-121 continues to respond to control console signals when the internal scene is activated. The intensity of any given channel will be the "greatest of" or "pile on" result of the internal scene and console level setting.
Page 8 of 13 RD - 121 RACK MOUNT DIMMER OWNERS MANUAL Version 1.2 1. 02/28/2005 Push MENU 3 times. The LCD will appear as shown: MENU 2. Push SELECT. Then push MENU. The LCD will appear as shown: The bottom display row shows the currently selected pattern. The pattern "4Ch Seq" is shown as an example. 3. Use the UP and DOWN arrow buttons to scroll through the available chase patterns. Push SELECT when the desired pattern appears.
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Page 10 of 13 RD - 121 RACK MOUNT DIMMER Version 1.2 OWNERS MANUAL 02/28/2005 CREATING YOUR OWN CUSTOM CHASE PATTERN The programmable chase pattern is created by setting the intensity for all dimmer channels for each step in the chase. The chase step is then recorded. This action is then repeated for each additional step to be recorded. The channel intensities can be set either from the RD-121 front panel as in manual operation or by using a control console. TO SAVE A CHASE STEP: 1.
Page 11 of 13 RD - 121 RACK MOUNT DIMMER OWNERS MANUAL Version 1.2 02/28/2005 MAINTENANCE AND REPAIR TROUBLESHOOTING VERIFY THAT ALL POWER IS REMOVED FROM THE DIMMER BEFORE HANDLING THE UNIT. • • • • To simplify troubleshooting - reset the unit to provide a known set of conditions. Check that the console is powered and that console channels are correctly patched or set. Check the control cable between the dimmer and its console. Verify the loads and their connections.
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WARRANTY All Lightronics products are warranted for a period of TWO/FIVE YEARS from the date of purchase against defects in materials and workmanship. This warranty is subject to the following restrictions and conditions: A) If service is required, you may be asked to provide proof of purchase from an authorized Lightronics dealer.
