Leviton MRIDC User manual

IMPORTANT - SAVE THESE INSTRUCTIONS
PLEASE READ THIS MANUAL BEFORE USING EQUIPMENT
PART # 110494
MRIDC LIGHTING UNIT
OWNERS MANUAL
Leviton Lighting Management Systems
Manufactured by:
for MRI Room Lighting Applications

CONTENTS
TABLE OF CONTENTS
RECEIVING THE MRIDC DIMMER ..................................................................................................................6
INSPECTION ....................................................................................................................................................6
STORAGE.........................................................................................................................................................6
REMOVING THE MRIDC DIMMER FROM THE SKID .....................................................................................6
GENERAL DESCRIPTION / SAFETY PRECAUTIONS ...................................................................................7
PRELIMINARY INSTALLATION .......................................................................................................................8
CABINET DIMENSIONS, CLEARANCESAND WEIGHTS................................................................................9
INSTALLATION .........................................................................................................................................10-11
DIMMER SWITCH INSTALLATION ...........................................................................................................12-13
SET - UP .........................................................................................................................................................14
START UP AND OPERATION ........................................................................................................................15
PREVENTIVEMAINTENANCE ................................................................................................................................16
TROUBLESHOOTING....................................................................................................................................17
COMPONENT DESCRIPTION .......................................................................................................................18
SPECIFICATIONS......................................................................................................................................................19
WARRANTY..........................................................................................................................................20
APPENDIXA..............................................................................................................................................................21
CABINETOUTLINE....................................................................................................................................................22
COMPONENT LOCATION DIAGRAM..................................................................................................23
CIRCUIT DIAGRAMS...........................................................................................................................24-27
SYMBOLS................................................................................................................................................28
NOTES.......................................................................................................................29

Page 6
REMOVING THE MRIDC DIMMER FROM THE PALLET (if applicable)
Please take special care when removing the unit from the pallet and/or container. Proper equipment must be
used when lifting and moving. Safety precautions should be taken. Larger sizes should be lifted with a pallet jack
or a fork lift.
When removing the MRIDC Dimmer from the pallet and/or container, be sure to take proper safety precautions.
Serious injury and/or unit damage can result from not taking proper precautions.
INSPECTING THE MRIDC DIMMER
Upon receipt of the unit, visually inspect for shipping damage. If any damage is found, the Purchaser must
contact the Carrier immediately and file a shipping damage claim.
If any damage has occurred that could affect the operation of the unit, please contact Leviton Lighting
Management Systems.
Leviton Technical Support 1-800-959-6004.
STORING
If it is necessary to store the unit for a period of time before it is installed, be sure to place the unit in a clean, dry
area. To prevent excessive dust from accumulating on the unit, it is advisable to protect it by replacing it in the
original container (if possible). If the original container is not available it is recommended that all openings that
lead internally into unit are covered so that dust, water or any other substance cannot enter inside the system.
The unit must be handled at all times with the same care you would give to any piece of precision industrial
equipment.
RECEIVING & INSPECTING THE UNIT

Page 7
GENERAL DESCRIPTION
GENERAL DESCRIPTION / SAFETY PRECAUTIONS
****** WARNING ******
THERE ARE DANGEROUSLY HIGH VOLTAGES PRESENT WITHIN THE
ENCLOSURE OF THE POWER SUPPLY SYSTEM. CAUTION MUST BE
TAKEN WHEN WORKING WITH THE SYSTEM. IT IS RECOMMENDED
THAT ALL WORK BE PERFORMED BY QUALIFIED ELECTRICAL
PERSONNEL ONLY.
SAFETY
In simple easy terms, the MRIDC Dimmer converts (AC) Alternating Current to (DC) Direct Current. The DC is
filtered (conditioned) to have lowAC ripple (a by-product of the conversion) for smooth DC power to the MRI room
lights. The level of DC voltage applied to the lights is controlled by the Transformer tap selection and the Dimmer
switch (supplied with the MRIDC Dimmer). The Dimmer switch provides “phase control” for the MRIDC Dimmer.
Low-level Electro-magnetic interference and low-frequency light flutter normally associated by the use ofAC power
is eliminated. Higher quality imaging is possible with the reduced chance of electrical interference to intercoms,
nurse call and fire alarm systems. Compromise of the RF shield is eliminated.
The MRIDC Dimmer device is very safe in terms of operational and personnel safety. All components are provided
in a NEMA 1 type industrial enclosure that requires a hand tool to open. Internal voltages are 170 volts or less.
Line and load overload protective devices are used for complete protection of the MRIDC Dimmer.

Page 8
PRELIMINARY INSTALLATION
Selecting a Location
The MRIDC Dimmer is provided in a steel enclosure suitable for mounting to a wall, the side of any existing
equipment or Unistrut®type mounting channel. The MRIDC Dimmer should be located in an area suitable for
unobstructed convection ventilation (typically utility room). Allow 3 feet in front of the MRIDC Dimmer for easy
accessibility and 4 inches on each side for ventilation. The MRIDC Dimmer is designed for vertical mounting.
All wiring to the MRIDC Dimmer should be performed by a qualified electrician. Only use copper type wiring of
suitable ampacity rating. Install according to NEC and Local codes. Refer to “Appendix A - Component Location
Diagram and Circuit Diagram” for connection points.
Installation Considerations
Prior to installing the MRIDC Dimmer, be sure to take into consideration the site you have selected. The MRIDC
Dimmer can produce heat and therefore require ventilation as well as accessibility. Consider these factors.
•Ventilation
•Weight Load
•Audible Noise Requirements
•Clean Environment
•Proper Ground Techniques
•Input Source Voltage
•Distribution of Power
•Room Temperature
•Clearances
•Accessibility

Page 9
CABINET DIMENSIONS, CLEARANCES AND WEIGHTS
SIZE Weight Dimensions
(DC Watts) (Lbs) H W D
600 77 24" x 20" x 10"
1200 82 24" x 20" x 10"
2000 137 24" x 20" x 10"
3000 175 24" x 20" x 10"
20.000
24.000
18.000
Ø 0.437 MOUNTING HOLES
22.500 21.500
10.000
24.000
LIFT OFF PANEL
INDICATOR
LIGHT
INPUT
CIRCUIT
BREAKER
RIGHT SIDE
BOTTOM VIEW
CONDUIT HOLES
TOP & BOTTOM
MAIN
BREAKER
POWER
ON
AIR VENTS
(BOTH SIDES)

Page 10
INSTALLATION
AC Input
The AC input power to the MRIDC Dimmer is 120 volts, 1-phase, 60Hz. A dedicated feed with upstream fuse or
circuit breaker protection is required. All wiring in and out of the MRIDC Dimmer enclosure should be made using
conduit. Knock-out provisions for 1/2 conduit are provided on top and bottom of the enclosure. Two-conductor
wire with ground, properly rated per NEC and Local code (or larger) should be used.
Terminals for the AC input are located inside of the MRIDC Dimmer. Refer to “Appendix A - Component Location
Diagram and Circuit Diagram” for connection points. The hot wire connects to L, Neutral to N and ground to G.
DC Output
The MRIDC Dimmer is designed to work only with incandescent lighting. The lamps should be wired in parallel.
Use the properly indicated transformer tap for the total watt rating of the load. The + and – terminals are located
inside of the MRIDC Dimmer. Refer to “Appendix A - Component Location Diagram and Circuit Diagram” for
connection points. The positive and negative wires should be run together in the same conduit to prevent
induction heating. The negative output is grounded to the cabinet. Normal field wiring may be used (as you
would in an AC application).
KW Size
V
oltage Current Breake
r
600 W 120 VAC 7
A
15
A
1200 W 120 VAC 15
A
25
A
2000 W 120 VAC 26
A
35
A
3000 W 120 VAC 41
A
50
A
SCLU Input
KW Size Voltage Current Fuse
600 W 120 VDC 5
A
8
A
1200 W 120 VDC 10
A
15
A
2000 W 120 VDC 16
A
20
A
3000 W 120 VDC 25
A
30
A
SCLU Output

Page 11
INSTALLATION
Wiring to the MRIDC Dimmer and Dimmer Switch
WARNING:
There are high-voltage signals (120vac) between
the MRIDC Dimmer and Dimmer switch.
Refer to the Dimmer switch sheets supplied in this manual for Dimmer installation.
The connection points for the Dimmer switch is inside the MRIDC Dimmer enclosure. Refer to “Appendix A -
Component Location Diagram and Circuit Diagram”. There are two black wires on the dimmer switch for “two
and three location” applications. Refer to the Dimmer switch data sheets on pages 12 - 13 for the proper wiring
method for your application.
****** WARNING ******
THERE ARE DANGEROUSLY HIGH VOLTAGES PRESENT WITHIN THE
ENCLOSURE OF THE POWER SUPPLY SYSTEM. CAUTION MUST BE
TAKEN WHEN WORKING WITH THE SYSTEM. IT IS RECOMMENDED
THAT ALL WORK BE PERFORMED BY QUALIFIED ELECTRICAL
PERSONNEL ONLY.

Page 12
DIMMER SWITCH INSTALLATION

Page 13
DIMMER SWITCH INSTALLATION

Page 14
SET - UP
Secondary Tap Selection
Transformer secondary tap selection is necessary to insure proper output voltage, unit operation and to extend
lamp life. Tap selection must be based on the maximum load wattage (sum of the wattage of all lights
connected to the MRIDC Dimmer output and select the tap rated slightly greater than the wattage). A minimum
30% load (of tap level) is required at all times. Improper tap selection may cause damage and will void the
manufacturer warranty. See the circuit diagram or tap rating charts below for tap wattages.
600 WATTS
85 WATTS
180 WATTS
WATT LIMIT FOR 120VDC OUTPUT
TAP # LAMP LOAD
TRANSFORMER SECONDARY TAPS
6
5
4
*
600W
TRANSFORMER SECONDARY TAPS
INDICATES FACTORY SETTING WHEN SHIPPED
*
*
1600 WATTS
7
500 WATTS
900 WATTS
1300 WATTS
2000 WATTS
LAMP LOAD
5
6
8
9
TAP #
WATT LIMIT FOR 120VDC OUTPUT
1700 WATTS
2300 WATTS
3000 WATTS
*4
5
6
LAMP LOAD TAP #
WATT LIMIT FOR 120VDC OUTPUT
TRANSFORMER SECONDARY TAPS
1200W
2000W 3000W
TRANSFORMER SECONDARY TAPS
*
400 WATTS
600 WATTS
800 WATTS
1000 WATTS
1200 WATTS
4
5
6
7
8
LAMP LOAD TAP #
WATT LIMIT FOR 120VDC OUTPUT
WARNING
30% MINIMUM PER TAP LOAD
LEVELS REQUIRED AT ALL TIMES

Page 15
START UP AND OPERATION
Initial Power-up
After the installation is complete, move the dimmer slide switch to the lowest (down) position. Turn on the Main
input circuit breaker. Verify the Dimmer, on/off switch is in the “ON” position and slide the dimmer knob to a
suitable illumination (setting).
The Dimmer switch can be left in the “On” position and the slide knob may always reside at the lowest setting.
Alternatively, the dimmer slide knob may be left at any setting and the dimmer on/off switch can be used at any
time.

Page 16
PREVENTIVE MAINTENANCE
Maintenance
WARNING: Make sure the power is turned OFF at the source to the MRIDC Dimmer before cleaning.
Duetothe solid-statenatureand natural convectioncoolingof the MRIDCDimmerdesign, maintenance isgenerally
not required. For dusty environments, it would be desirable to open the main cover and blow out the interior using
clean dry compressed air limited to 60 psi. The exterior can be wiped clean using a soft cloth slightly dampened
with a general purpose cleaner product.
****** WARNING ******
THERE ARE DANGEROUSLY HIGH VOLTAGES PRESENT WITHIN THE
ENCLOSURE OF THE POWER SUPPLY SYSTEM. CAUTION MUST BE
TAKEN WHEN WORKING WITH THE SYSTEM. IT IS RECOMMENDED
THAT ALL WORK BE PERFORMED BY QUALIFIED ELECTRICAL
PERSONNEL ONLY.

Page 17
TROUBLESHOOTING
Leviton Technical Support 1-800-959-6004

Page 18
COMPONENT DESCRIPTION
AC Circuit Breaker
Primary means of unit protection. Also main power On/Off switch.
Pilot Light
Indicator of AC main power on.
Dimmer Switch
Remote means of variable DC control (illumination). One 600 Watt (commercial brand)
Incandescent Dimmer switch (with ON/OFF) is provided with the MRIDC Dimmer.
Power Transformer
Provides line isolation and selectable power (adjustment) taps.
Adjustment Taps
Transformer secondary tap selection is necessary to insure proper output voltage, unit operation and to extend
lamp life. Tap selection must be based on the maximum load wattage (sum of the wattage of all lights
connected to the MRIDC Dimmer output and select the tap rated slightly greater than the wattage). A minimum
30% load (of tap level) is required at all times. Improper tap selection may cause damage and will void the
manufacturer warranty. See the circuit diagram or tap rating charts below for tap wattages.
Rectification
Thyristor(SCR)/Diode packs provide Full-wave, phase controlled rectification. The power pack (SCR / Diode) is
the main component that converts AC to DC power.
Filter Capacitors
Electrolytic type capacitors oppose a change in voltage (reduces the AC RMS voltage) and with the filter choke
(inductor) reduces the AC component (known as ripple) on the DC output.
Filter Choke
The filter choke oppose a change in current and with the Electrolytic type capacitors reduces the AC component
(known as ripple) on the DC output.
Bleeder/Stability Resistors
Provides a path of discharge for the filter capacitors.
DC Output Fuse
A Time Delay fuse on the positive output provides rectifier and load wiring protection.

Page 19
SPECIFICATIONS
Specifications
Enclosure: NEMA 1 type, ventilated. 24"W x 20"H x 10"D
Weight: 600W=77lbs.
1200W=82 lbs.
2000W=137 lbs.
3000W=175 lbs.
Color: Commercial White Hi-Gloss Epoxy.
AC Input: 120 volts, 1-phase, 60 Hz, 600W=7 amperes, 1200W=15 amperes, 2000W=26 amperes,
3000W=41 amperes.
DC Output: 0-120 volt, 100% Duty rated with Transformer Power tap selection.
DC Control: 600 Watt, Incandescent Dimmer Switch.
Regulation: 0-100% dimmer voltage range. Inherent +/-5% regulation.
AC Ripple: < 5 % rms. ripple throughout the full range.
Efficiency: 75% at full output. 1,364 maximum Btu’s/hr.

Page 20
WARRANTY
This Warranty applies only to the original purchaser who must properly
register the product within ten (10) days of receipt.
1. This Warranty shall be effective only if and so long as the system is installed and operated
in the manner specified in the manual which accompanied the product, and is operated
within the ratings on the nameplate of the system.
2. This Warranty shall be effective provided the purchaser pays the cost of transporting the
faulty component(s) to and from Leviton Lighting Management Systems factory at the
purchaser’s own expense. There is no cost for installation of the replacement
component(s) when done at the factory. Otherwise installation of the replacement
component(s) are the responsibility of the purchaser. If after inspection the faulty
component has been caused by misuse or abnormal conditions in the judgment of Leviton
Lighting Management Systems, the purchaser will be charged for repairs based on parts
and labor required. This Warranty does not cover fuses, light bulbs, and other normally
expendable items. Leviton Lighting Management Systems service personnel are not
included in this warranty.
3. This Warranty shall be void if any alteration is made to the system, or any of its
components are altered by anyone other than an authorized Leviton Lighting
Management Systems service person, without the written permission of Leviton Lighting
Management Systems.
4. This Warranty is in lieu of all other warranties, expressed or implied. Leviton Lighting
Management Systems neither assumes, nor authorizes any person to assume for it, any
liability other than that specifically set forth in this Warranty. Except for its obligations,
Leviton Lighting Management Systems assumes no liability or responsibility for personal
injury, loss of life, consequential or other damages resulting from defects in, or failure of,
the system or any of its components.
Leviton Lighting Management Systems warrants that our products and their components will
remain free from defects in material and workmanship for the period of two (2) years from the
date of shipment and agrees to replace, F.O.B. its factory, any parts which fault through defect
in material or workmanship during such period.
Leviton Lighting Management Systems
2222 222nd Street SE,
Bothell, WA 98021-4416
Phone [phone]
Fax [phone]
Leviton Technical Support 1-800-959-6004