Control Wiring - NSI 2408CD Installation And Operation Manual

2408 CD / CR DIMMER SYSTEM
Software Revision 2.0, Version C
TESTING
If desired, the dimmer may be tested without any control signal input by moving SWITCH #8 to
the off and then the on position on both of the dimmer firing cards after the system is energized.
This will cause all dimmer channels to go to full intensity for testing load circuits. Dimmers will
ignore all control signals in this case.
NOTE: If Switch #8 is set on before power is applied to the dimmers, then the lighting loads associated
with that firing card will come to 50% intensity (full on for CR's) when power comes on. This is useful
for emergency lighting purposes. The console or remote panels may take control after light come on.
INSPECT INSIDE OF DIMMER PACK FOR LOOSE BITS OF WIRE OR HARDWARE THAT MAY
HAVE FALLEN ONTO THE CONTROL CIRCUIT BOARDS AND BE SURE ALL INPUT AND
LOAD WIRING IS COMPLETE BEFORE ENERGIZING ELECTRICAL SERVICE TO DIMMER.

CONTROL WIRING

Control wiring to the 2408CD should be Class 2 wiring. All control wiring must stay below the
barrier separating the control wiring compartment from the load wiring. All control wiring must
exit out of either of the 1/2"-3/4" knockouts located in the control wiring compartment. Several
types of low voltage control inputs may be employed as discussed below. Under no
circumstances can any control signal input exceed 15 volts.
Individual 0 -10 VDC control wiring.
Each of the eight dimmer channels of the 2408 CD/CR may be operated by a O -10 VDC
control voltage. This type of control will provide 0% intensity at 0 volts and 100% intensity at
10 volts. Any or all of the dimmer channels may be operated in this manner simultaneously with
either of the multiplex control inputs. Each dimmer will respond to the greater of any control
inputs.
Connect each of the plus control wires to the desired dimmer channel connections (see diagram)
on each of the dimmer firing cards. Connect the common control wire to one of the COMMON
connections provided on the power supply card. This control input impedance is 4.7K ohms.
If a +15 VDC power source is required for the control console, connect an additional wire to the
+ 15 VDC terminal on the power supply board. This wire and the common wire must be at least
18 gauge. This power supply can deliver 750 MA maximum and can be connected in parallel to
other 2408 CD/CR packs.
DMX-512 multiple control wiring.
DMX-512 is the preferred type of control wiring because of the high update rate and the
resistance to interference. It is highly recommended in locations subject to electrical noise.
DMX-512 only requires 3 wires transmit lighting levels to as many as 512 dimmer channels.
DMX-512 should not be used simultaneously with Microplex. Most of the NSI lighting control
consoles can use this interface.
Connect the three DMX-512 control wires to the appropriate terminals provided on the power
supply card. Duplicate terminals are provided to carry the control connections to more dimmer
packs if necessary. Be sure to set the Channel Address on the dipswitches of the dimmer firing
cards as required. If a+ 15 VDC power source is required for the control console, connect an
additional wire to the + 15 VDC terminal on the power supply board. This wire and the common
wire must be at least 18 gauge. This power supply can deliver 750 MA maximum and can be
connected in parallel to other 2408 CD/CR packs.
CAUTION
TESTING
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