Variable Bright/Dim Lighting Controller
MSM295G
Product Description
Installation Guidelines
The MSM295G is a two-channel variable bright/dim lighting
controller. The controller is designed to turn ON/OFF and vary the
intensity of lamps used in reading, table, or other lighting
situations. The two-channel design allows control of two lamps
from a single MSM295G. The unit uses a pulse width modulator
circuit for power efficiency. The controller has Master ON/OFF,
bright, and dim functions that override the individual control inputs.
1.
Features
2.
All power, input, output, and ground wires shall be 22 AWG,
MINIMUM. Ground wires shall be grounded within twelve
(12) inches of the unit.
Protect power wires with circuit breakers or fuses located
close to the electrical power source bus.
Technical Specifications
Electrical
Power
The following list provides an overview of features for the
MSM295G:
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Dual circuits in one unit for control of two lamps
ON/OFF and variable lighting from BRIGHT to DIM functions
Single input control for each circuit
Output to light the status annunciator LED in a switch panel
when lamp is ON
Master circuit overrides both individual circuits
Lightweight, compact size
Solid state circuitry
100 mA Idle Current
Maximum Current
Ratings
1 A each CKT1 & CKT2
2 A both channels driven
Switch Contact In
< 1 VDC, Momentary Grd
Input Timing
Application Notes
1.
2.
3.
4.
5.
The MSM295G is designed with two independent circuits
(CKT1 and CKT2) for the control of ON/OFF, BRIGHT, and
DIM lighting functions. A master circuit controls both of the
independent circuits.
The controller powers up in the OFF position.
This
configuration cannot be altered.
Applying momentary ground less than 250 mS to the switch
input turns the lamp ON in the BRIGHT state. The next
momentary ground input less than 250 mS turns the lamp
OFF.
When the circuit is in the ON and BRIGHT state, applying a
momentary ground input greater than 250 mS on the switch
contact varies the output towards 0V, causing the lamp
intensity to begin to dim. Release the momentary ground
input when the lamp is at the desired intensity. The next
momentary ground input less than 250 mS turns the unit
OFF. If the desired setting is missed, the lamp must be
turned OFF and ON to reset the circuit.
The Master has 4 inputs to control CKT1 and CKT2
simultaneously.
The Master SET input turns all lights
connected to this module to the ON and BRIGHT state. The
Master RESET turns all lights connected to the module to the
OFF state. Both require momentary ground application. The
Master BRIGHT and DIM inputs require momentary ground
inputs to vary the intensity of both circuits.
2.5 A max at +28 VDC
Internal Circuitry
Mom. Gnd. < 250 mS =
ON/OFF
Cont. Gnd. > 250 mS =
Variable DIM to BRIGHT
Status Out LED
Gnd, 450 mA Max. Sink
Variable Output
0 to +28 VDC
Master Inputs
< 1 VDC, Momentary Gnd,
REQUIRED
Dimensions
5.0” x 5.0” x 1.0”
(l x w x h)
12.7cm x 12.7cm x 2.6cm
Mechanical
Mating Connector
DBMA-25S
Weight
7.2 oz / 201.6 gr
Drawings
Description
522303 Rev IR
MSM295G Outline Drawing
Document # 530331 – Revision History
Level
Date
Description
IR
10/1999
Initial Release
PROPRIETARY NOTICE
Despite any copyright notice, this data and information
disclosed herein contains confidential, proprietary designs owned
by Audio International, Incorporated. Neither this data nor the data
contained herein shall be reproduced, used, or disclosed to
anyone without the written authorization of Audio International, Inc.
Audio International, Inc. • 7300 Industry Drive, N Little Rock, AR 72117 • Phone 501-955-2929 / Fax 501-955-2988 / www.audiointl.com