120V/277V SCR Inductive Dimmer Module

120V/277V SCR Inductive Dimmer Module
120V/277V SCR Inductive Dimmer Module
Models: 74172 / 74173 / 74191 / 74192 / 74270 / 74290
For use with the following A21 Lighting Control Panels:
A21 3-Space Panel (74121), A21 6-Space Panel (74123), A21 9-Space Panel (74130)
A21 120V/277V SCR Inductive Dimmer Module
Installation & Operation Guide
The A21 SCR Inductive Dimmer Modules offer reliable dimming of incandescent
and inductive load types, including magnetic low-voltage transformers.
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.)
Blank Cover
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.
Screw (4)
Focus Button
& Status LEDs
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.
NOTE: The A21 9-Module
Panel is used to illustrate
the installation. However,
module installation is identical for all Lighting Control Panel models.
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.
Step 7. Close panel front cover.
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
Electrical Specifications
Operating Voltage: 120VAC, 50/60Hz
Number of Circuits: 2
Min Rated Load (per circuit): 35W
Max Rated Load (per circuit):74172: 1800VA
74173: 2400VA
Operating Voltage: 120VAC, 50/60Hz
Number of Circuits: 4
Min Rated Load (per circuit): 35W
Max Rated Load (per circuit):74191: 2000VA
74192: 1800VA
Operating Voltage: 277VAC, 50/60Hz
Number of Circuits: 2
Min Rated Load (per circuit): 35W
Max Rated Load (per circuit):74270: 4000VA
Operating Voltage: 277VAC, 50/60Hz
Number of Circuits: 4
Min Rated Load (per circuit): 35W
Max Rated Load (per circuit):74290: 4000VA
Supported Load Types: Incandescent, Inductive,
Magnetic Low Voltage, Electronic Low Voltage *
Cooling: Natural convection
Ambient Operating Temp: 0 to 40 degrees C
Relative Humidity: 5 to 95% (non-condensing)
Strand Lighting
Figure 1: Installing Modules and Blank Covers
Step 2. Disconnect main power to A21 Lighting Control Panel.
Step 3. Open dimmer module side of panel front cover.
Load Terminal Block
Dimming Electronic Low Voltage loads with an SCR
Inductive Dimmer may produce objectionable noise.
For quiet dimming of Electronic Low Voltage loads,
please consider using Strand IGBT Dimmers.
Tel: 214-647-7880 | Fax: 214-647-8031
©2010 Philips Group
P/N: 85-1559E
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