Leviton MDS Dimmer Cabinets

• Intermix 120V and 277V Dimmers in a Single Enclosure
• Dim Virtually any Fluorescent Dimmer Ballast
• Use with All Leviton Control Types Including DMX 512
• Modular Construction
• Plug-In Dimmer Modules
• 120/208, 230/400, 277/480, 347/600 Volt
• All Convection Cooled (No Fans)
• Factory Wired and Tested
• Option to Incorporate UL1008 Transfer Contactor
• UL Listed, cUL Listed

Leviton MDS dimmer cabinets are premium quality convection cooled systems capable of intermixing multiple voltage feeds and emergency provisions in a single cabinet. It is completely factory wired and tested prior to shipment so that the Electrical Contractor has only one cabinet to mount and wire, and comes completely ready for the contractor’s power and control field wiring. Barriered sections allow 120 volt, 277 volt, and emergency feeds all brought into a single cabinet for ease of field wiring. No need for jobsite conduit runs between multiple cabinets. Dimmers for this system can drive virtually any type of brand of fluorescent dimming ballasts. A wide variety of the latest controls and control technologies are available for use with these dimmers and cabinets. Three series of Leviton digital control systems the D8000 and D4200 and DMS allow multiple presets to be stored and recalled. They offer user-friendly operation, and simple communications between the dimmer cabinet and control stations via 2 serial data wires, and 2 series low voltage control power wires. MDS cabinets accept analog inputs from DPS series control systems. The DPS four scene preset system is by far the industry’s simplest and easiest control system to learn to operate today. The robust and conservative design of this equipment makes it ideal for 24/7 continuous service applications where it is continuously on line.

DIMMER MODULES Leviton Lighting Control Division manufactures a wide range of dimmers to control the majority of modern lighting sources available today. These include Neon/Cold Cathode, Fluorescent (using virtually any type or brand of fluorescent dimming ballasts), Low Voltage and Incandescent (including Q u a rtz Halogen). Twenty ampere, 2400 watt dimmers are supplied as two dimmers in one chassis, larger sizes are supplied as one dimmer per chassis. The dimmers are built on a rugged extruded aluminum chassis with a finned surface for convection cooling. Power and control connection are plug-in for ease of maintenance. The dimming function is performed by Leviton Lighting Control Division’s exclusive solid state circuitry using high inrush silicon controlled rectifiers (SCR) in a back to back configuration for handling high power. Dimmer output is highly filtered, with high rise times. Each dimmer type is available in a full range of capacities from 1440 watts to 12,000 watts at 120 volts, and up to 27,700 watts at 277 volts. Primary circuit breakers and branch circuit breakers are provided as required. Canadian 347 volt dimmers are available.

DIMMER CABINETS Typical Internal Wiring Schematic The key to Leviton Lighting Control Division’s Modular Dimming System (MDS) flexibility is the variety of dimming cabinets available. They go together like building blocks to make the exact size cabinet needed for any job requirements. Further, they are easily barriered into sections to accommodate multi-voltage feeds (example 120V and 277V) including emergency feeds all into the same cabinet. Dimmers are available for virtually all brands and varieties of fluorescent dimmer ballasts, as well as incandescent dimmers, and non dims. The cabinets easily accommodate main circuit breakers as well as main lugs. The cabinet can contain bypass contactors for emergency circuits, or where required, can contain UL 1008 emergency transfer contactors, all in a single cabinet structure. Both wall mount and floor standing cabinets are available depending on the quantity of dimmers required. Typical dimmer per circuit designs require only 20 ampere dimmers. However, for special requirements such as driving 5,000 watt and 10,000 watt fresnels, larger dimmers offering up to 12,000 watts of load capacity are available. Dimmers are all convection cooled, eliminating fan noise. They are ideal for applications where fan noise would be unacceptable.

The following method is a simple way to estimate the size of the dimmer cabinet. All dimmer cabinets are custom fabricated in the Leviton plant. If a special size or shape dimmer cabinet is required, contact your factory representative or Leviton for assistance. As change can occur during engineering and fabrication, Leviton Lighting Control Division reserves the right to change the cabinet size when necessary to meet the job requirements.

CALCULATING CABINET SIZE

1. Find the total number of 4" module units using Table 1. Note: Dual dimmer modules contain 2 dimmers in one 4-inch dimmer unit space.

2. Locate the total height on the chart below. All cabinet dimensions are based on 4 inch units.

3. Follow it across and down to the cabinet drawing.

4. Read the cabinet width and the bottom of the cabinet drawing, and the height at the side.