AMX RDM-MDM User Manual

Installation Sheet

RDM-MDM Multimode Dimmer Module

2400 W

The RDM-MDM Multimode Dimmer Module is ideally used in situations
where the load is not specified or the load may change at the last moment.
This unit is a unique combination 2400 W Incandescent dimmer,

2400 W Switch, or 2400 W FDB fluorescent dimmer. It consists of a heavy
duty SSR construction for dimming and a heavy duty positive air gap relay
for switching. The RDM-MDM module's 120 and 240-277 VAC ratings are
CE, UL, and C-UL approved.

Mounting points

Neutral

Line

Dimmed
Switched

350 µS Choke

Mechanical Relay

2400 W power device

High-voltage
connections

Caution Pre-Installation Notes:

• All Class 1 wiring must be connected to proper terminals.

• All control wiring must be connected to proper terminals.

• Disconnect power while installing or connecting the unit.

• Keep top and bottom air vents clear at all times.

• Test loads for shorts before connecting.

• Use low-voltage wires with a 300 volt rating or greater.

• Use field-installed copper conductors.

• Run all low-voltage and control wires away from heat producing parts
of the dimmer.

• Each dimming circuit must have a separate neutral connection.

• All electrical ratings are for continuous duty.

• For indoor use only.

• AC lighting loads only.

• This module may require extra power from the AXlink connection or an
external power supply connected to the control card.

Connecting RDM Series Modules to the RDM-MDM:

Pin 4 (GND)
Pin 3 (RLY)

Pin 2 (DIM)
Pin 1 (+12 V)

RDM-MDM four-pin module connector

4-pin plug from a RDM series module

Note: The 4-pin plugs from the module
connector to the 4-pin connector on the
master (black plug cover facing up).

Low-voltage control
wiring: four-pin connector
to AMX Lighting master
controller

FIG. 1 RDM-MDM

RDM-MDM UL and C-UL Ratings:

• 120 VAC, 50/60 Hz, 2400 W per circuit

• 240/277 VAC, 50/60 Hz, 2400 W per circuit

Specifications:

• Dimensions (HW): 10.00" x 2.75" (25.40 cm x 6.99 cm)

• Phase dependant dimming

• Use wires rated at 75°C (167°F)

• Torque terminals to 7 in-lbs (0.8 N/M)

• Max. wire size: 10 AWG (4 mm²)

• Wire stripping length: 0.28" (7 mm)

• Weight: 4.5 lbs (2.04 kg)

• BTU/hr: 300

• Control current: 190 mA @ 12 VDC

Suggested Loads:

• Incandescent • Two-wire, phase-controlled ballast

• Low-voltage • Three-wire, phase-controlled ballast

• Neon, cold-cathode • Switched fluorescent ballast

FIG. 2 Connecting RDM series modules to the RDM-MDM

Switch configuration

FIG. 3 Method A

Lighting Application Drawings

Method A

120 VAC, 1Ø /

FIG. 4 Method B

Three-wire (FDB) configuration

FIG. 5 Method C

Method B

120 VAC, 1Ø /

Dimming configuration

Method C

120 VAC, 1Ø /

AMX Corporation reserves the right to alter specifications without notice at any time.

For full warranty information, refer to the AMX Instruction Manual(s) associated with your Product(s).

The AMX logo is a trademark of AMX Corporation. AMX Corporation reserves the right to alter specifications without notice at any time.

3000 research drive, richardson, TX 75082 USA • 469.624.8000 • 800.222.0193 • fax [phone] • technical support 800.932.6993

043-019-2299 10/01 ©2001 AMX Corporation. All rights reserved.