Variable Bright/Dim Lighting Controller
MSM295D
Product Description
The MSM295D 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 MSM295D. 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.
Technical Specifications
Electrical
Features
The following list provides an overview of features for the
MSM295D:
G
G
G
G
Dual circuits in one unit for control of two lamps
ON/OFF, BRIGHT/DIM, and variable lighting functions
Three input control for each circuit
Output to light the status annunciator LED in a switch panel
when lamp is ON
G Master circuit overrides both individual circuits
G Lightweight, compact size
G Solid state circuitry
Power, Internal
Circuitry
2.5 A max at +28 VDC
100 mA Idle Current
Max Current
Ratings
1 A each CKT1 & CKT2
2 A both channels driven
Switch Contact In
< 1 VDC, Momentary
Ground
Status Out LED
Ground, 100 mA Max. Sink
Variable Output
0 to +28 VDC
Master Inputs
< 1 VDC, Momentary
ground required
Power Up Reset
Power down >10 seconds
will allow power up reset to
be activated
Mechanical
Dimensions
5.0”L x 3.35”W x 1.0”H
Mating Connector
DBMA-25S
Weight
7.2 ounces / 201.6 grams
Application Notes
1.
2.
3.
4.
5.
The MSM295D 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 ON position and DIM state.
The power-up setting can be bypassed by holding the
BRIGHT contact and pressing the read light switch at the
same time. This action causes the unit to power-up in the ON
position and the BRIGHT state.
The ON/OFF function is controlled by a momentary ground
input of less than 250 mS duration. The BRIGHT and DIM
functions are only active when the circuit is in the ON
condition and are controlled by a momentary ground input.
Variable output is controlled by applying momentary ground
on the BRIGHT or DIM inputs until the desired light intensity
is obtained.
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 DIM 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.
Drawings
Description
530026 Rev IR1
MSM295D Specification Drawing
Document # 530118A – Revision History
Level
Date
Description
IR
7/1998
Initial Release
A
8/1999
Update features, correct power / weight
Installation Guidelines
1.
2.
All power, input, output, and ground wires must be 22 AWG
minimum. Ground wires must be grounded within twelve
inches of the unit.
Protect power wires with circuit breakers or fuses located
close to the electrical power source bus.
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