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Installation Sheet

RDM-FDB Single Channel Lutron FDB Ballast Dimmer

1920 W

The RDM-FDB Single Channel Ballast Dimmer is a 1920 W positive air gap 
relay and dimmer, built for strength and for reliable switching/dimming of 
Lutron FDB ballasts. It is designed for use with the RDA series of enclo-
sures, in a AMX Lighting™ modular digital dimming system. The RDM-FDB 
module's 120, 240, and 277 VAC ratings are CE, UL, and C-UL approved.  

RDM-FDB UL and C-UL Ratings

120 VAC, 1920 W

240/277 VAC, 1920 W

Suggested Dimmed Loads

Most 3-wire dimmable fluorescent ballasts

Lutron

©

 Hi-Lume

®

 FDB Ballasts

Lutron Eco-10

®

 Ballasts

Specifications:

Dimensions (HW): 10.0" x 2.75" (25.4 cm x 6.99 cm)

Dimmed output protected by a 250 mA GMA 5 x 20 mm fuse

Phase dependant

Use wires rated at 75°C (167°F)

Torque terminals to 20 in-lbs. (2.3 N/M)

Max. wire size: 10 AWG (4 mm²)

Wire stripping length: 0.28" (7 mm)

Weight: .72 lbs. (0.327 kg)

BTU/hr:  5

Control current: 85 mA @ 12 VDC

For use with FDB ballasts

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.

Use field installed copper conductors.

All electrical ratings are for continuous duty.

For indoor use only.

This module may require extra power from the AXlink connection or an 

external power supply connected to the control card.

Connecting the RDM-FDB to the AMX Lighting Master

Lighting Appplication Drawing 

FIG. 1  RDM-FDB

Mounting points

Fuse

Positive air
gap relay

Dimmed out

Relay

Line in (hot)
Switched out

Low-voltage
control wiring: 4-pin
connector to AMX
Lighting master
controller

Ballast A

FIG. 2  RDM-FDB connections

FIG. 3  RDM-FDB wiring configuration

Pin 4 (GND)

Pin 3 (RLY)

Pin 2 (DIM)

Pin 1 (+12 V)

RDM-FDB 4-pin module connector

3 (-)

2 (AC)

1 (+)

4-pin plug from 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).

 

 

BALLAST

 

Ballast

Circuit breaker
panel

The fuse protects the dimming 
circuit from a low impedance 
load.

The fuse would blow if it 

were incorrectly wired

Catastrophic ballast failure

Reversing switched and

dimmed circuits

Reversing dimmed and

line circuits.

The dimmed output 

must

 be

connected to a high impedance 
load.

All neutrals are
common to the
Neutral block in the
enclosure. Provide
a separate neutral
for each load.

Neutral

Line in (HOT)

Switched

Dimmed

Florescent
Ballast

Neutral

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