Lightronics RE121D - Manual (Page 4)

Page 4 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
OUTPUT CHANNEL CONNECTIONS
The RE-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. There
is also a ground lug terminal to be used for your load circuits grounds.
OPERATION
CHANNEL ASSIGNMENT
The starting channel of each RE-121 is selected using the DIP switches on the front panel. The table below
indicates the actual value of each DIP switch position. A chart at the end of this manual "CHANNEL
ASSIGNMENT SWITCH SETTINGS" provides further information for setting the starting address DIP switches.
Any switch in the up position ADDS the associated value to the starting channel number. All switches down =
starting channel number 1.
For example: to set the starting channel to 13, move the 2nd switch from the right (value 8) and the 1st switch
from the right (value 4) to the up position. For a starting channel of 21, move the third switch from the right (value
16) and the rightmost switch (value 4) to the up position. A complete table of address assignments is provided
further on in this manual.
OPERATION
MANUAL CONTROL
Dimmer channels can be activated manually by pressing corresponding button switches located on the front
panel. This will latch the associated channel to full on. Push the button again to turn the channel off. The
associated LED will light when the channel is activated.
NORMAL OPERATION
LEDs located on the front panel of the RE-121 indicate channel levels as you operate faders on your console. The
"VALID SIGNAL" LED will light whenever the dimmer is receiving a control signal within the range of channels
that the dimmer is assigned to. The "Phase A" and "Phase B" LEDs will indicate that power sources are applied to
the dimmer. The fan will run continuously whenever power is applied to the RE-121. An over-temperature sensor
will shut down all channel output if the dimmer temperature rises above safe limits (
≈175°F exit air temperature).
RELAY MODE
The two leftmost DIP switches on the front panel control the "relay" mode. When either switch is in the up
position, the channels associated with that switch operate in non-dim mode. These channels will be either full on
or full off depending on the level of the faders controlling them.
256 128 64 32 16 8 4
ON
OFF
A-F G-L
ADDRESS
RELAY
MODE