120V/277V 3-Wire Fluorescent Dimmer Module

120V/277V 3-Wire Fluorescent Dimmer Module
120V/277V 3-Wire Fluorescent Dimmer Module
Models: 74180 / 74294
For use with the following A21 120V/277V Lighting Control Panels:
A21 3-Space Panel, A21 6-Space Panel, A21 9-Space Panel
A21 120V/277V 3-Wire Fluorescent Dimmer Module
Installation & Operation Guide
The A21 3-Wire Fluorescent Dimmer Module is designed to provide dimming of
Strand 3-wire phase control dimming ballasts where two wires are used for hot and
neutral, and a third wire carries the phase control signal. (For control of Lightolier®
Controls PowerSpec® HDF dimming ballasts, use an A21 "HDF" series module).
Screw (4)
All A21 Dimmer Modules have identical mounting dimensions, allowing them to
be easily swapped within any of the A21 Lighting Control Panels. (Use caution to
ensure that quad dimmer modules are not installed into module spaces wired for
dual dimmer modules.)
Screw (4)
WARNING: Installing the module with power applied to the cabinet may
expose you to dangerous voltage and damage the device. Remove power
before installing. A qualified electrician should perform this installation.
Focus Button
& Status LEDs
Blank Cover
Any combination of A21 dimming and relay modules may be installed in the Lighting Control Panel. Blank covers MUST be installed in any unused spaces. Pull the
jumper (shorting plugs) before installing.
To install modules:
Step 1. Unpack module and recycle or properly discard packaging materials. (Be
sure to keep this instruction sheet for future use.) Inspect dimming
module for signs of damage during transit.
Step 2. Disconnect main power to A21 Lighting Control Panel.
Load Terminal Block
NOTE: The A21 9-Module
Panel is used to illustrate
the installation. However,
module installation is identical for all Lighting Control Panel models.
Figure 1: Installing Modules and Blank Covers
Step 3. Open dimmer module side of panel front cover.
Step 4. If present, remove blank cover from location where module is to be
installed (Figure 1). When possible, lower modules should be installed
Step 5. Remove shorting plugs from the load terminal block. (The shorting plug
is the red tab protruding from the green load terminal block.) To remove,
grasp the shorting plug and gently pull. Note: The dimmer module will
not operate properly if the shorting plug is left in circuit.
Step 6. Gently insert module into lighting control panel, heatsink first. Secure
module using four screws (provided). Dimmer Module should be
installed with the heatsink facing away from you. Note: The connectors
of 277VAC A21 modules are keyed, preventing the insertion of modules
into panels of the incorrect voltage. Do not force modules into slots.
Step 7. Connect control wire from fluorescent dimming ballast to appropriate
screw terminal on dimmer module (Figure 2).
A21 Dimmer Modules are equipped with a "Focus Button" on each circuit
(Figure 1). Tapping the focus button quickly will turn the circuit on to full, tapping
it quickly again will turn the circuit off. Pressing and holding the focus button will
ramp the dimmer up to full intensity. If the focus button is released before reaching
full intensity, the dimmer will stop at that relative output.
Green LED
Focus Mode (controlled at dimmer)
Communication Error
10911 Petal Street
Dallas, TX 75238 USA
Switched B
Leg (Hot)
Dimmer A
Dimmer B
Figure 2: Ballast Wiring Connections
Electrical Specifications
Operating Voltage: 120VAC, 50/60Hz
Number of Circuits: 2
Min Rated Load (per circuit): 35W
Max Rated Load (per circuit): 2000VA (74180)
Operating Voltage: 277VAC, 60Hz
Number of Circuits: 2
Min. Rated Load (per circuit): 35W
Max Rated Load (per circuit): 4000VA (74294)
Step 8. Close panel front cover.
Strand Lighting
Switched A
Leg (Hot)
Supported Load Types: 3-Wire Phase Control
Fluorescent Dimming Ballasts
Cooling: Natural convection
Ambient Operating Temp: 0 to 40 degrees C
Relative Humidity: 5 to 95% (non-condensing)
Tel: 214-647-7880 | Fax: 214-647-8031
©2010 Philips Group
P/N: 85-1561D
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