www.kenall.com | P: 800-4-Kenall | F: 262-891-9701 | 10200 55th Street Kenosha, Wisconsin 53144, USA
This product complies with the Buy American Act: manufactured in the United States with more than 50% of the component cost of US origin. It may be covered by patents
found at www.kenall.com/patents. Content of specification sheets is subject to change; please consult www.kenall.com for current product details. ©2019 Kenall Mfg.Co.
3
INSTALLATION INSTRUCTIONS
MRIPSF-480_F-7499_031919
0-10V Dimming Filter Mounting Procedure
1. Mount the Kenall MRIFD-1A dimming-line filter directly to outer enclosure wall via rear NPT conduit pipe using
all provided gasketing and hardware (1-5/16” diameter hole size). See Figure 1 for details.
2. Run grounded ½” conduit, with proper size conduit fittings, between the dimmer/controller and the input of
the EMI filter. Make sure all gaps, regardless of size, are closed or wrapped in copper foil tape.
NOTE:
The 0-10V dimmer must be installed
outside
the shielded MRI environment.
Wiring Procedure - Single Power Supply DC Filter
Use the following procedure if only one power supply and DC EMI filter are to be connected in this installation.
Refer to “Wiring Procedure - Multiple Power Supply/DC Filters” for multiple power supply installations. The overall
system schematic is shown within Figure 2.
1. Make 120-277VAC, 50/60Hz supply connections on the line voltage side of the power supply. Make sure a
proper ground is connected.
2. Run DC wiring, sized for the 20A maximum supply rating (supplied by others) from the power supply to the DC
EMI filter through the grounded conduit installed in “24VDC EMI Filter Mounting Procedure”.
WARNING: To prevent electrical shock, manually discharge the internal filter capacitors by
temporarily connecting field terminals to ground (wearing insulated gloves is recommended).
3. Remove lose hardware supplied on filter field terminal screws and install power cables to each terminal through
a crimped or solder-type ring connector (not supplied) using the supplied hardware. See Figure 3.
4. Remove lose hardware supplied on the ground screw terminal marked with the Green label and install a
ground wire identical in size and insulation rating to the grounded and ungrounded circuit supplied conductor,
except it shall be colored Green or Green-Yellow. Use a crimped or solder-type ring connector (not supplied, see
Figure 3). The ground wire shall be installed as part of the circuit that supplies the filter.
Luminaire 1
Luminaire 2
Luminaire N
(last)
EMI
Filter
EMI
Filter
RED
RED
BLACK
BLACK
VIOLET
GRAY
BLACK
RED
Repeat
Wiring As
Needed
INSIDE MRI ROOM
OUTSIDE MRI ROOM
+
–
NOTE: ALL WIRES INSIDE MRI ROOM TO BE
INSIDE GROUNDED RIDGID ALUMINUM CONDUIT
0-10V Dimmer
(by others)
COMMON
HOT
MRIPSF-480
MRIFD-1A
(or equal)
120-277VAC
50/60 Hz
AC
IN
+
24V
–
Figure 2: Single-Supply System Schematic
