A21 Dimming System - 120V / 277V IGBT Dimmer Module Installation

A21 Dimming System - 120V / 277V IGBT Dimmer Module Installation
A21 IGBT Dimmer Modules (120V / 277V)
Installation & Operation Guide
The A21 IGBT Dimmer Modules offer high performance dimming of various load
types, while operating at increased efficiency and reducing lamp noise on incandescent lamp types. IGBT Dimming Technology provides precise control over inrush
current without the use of chokes, and resists damage from short circuits.
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.)
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)
Blank Cover
Screw (4)
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.
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.
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.
Slow Flashing
Fast Flashing
Strand Lighting
Green LED
10911 Petal Street
Dallas, TX 75238 USA
No Load
Focus Mode (controller at dimmer)
Over Temperature
Communication Error
Miswire to Line
Focus Button
& Status LEDs
NOTE: The A21 9-Module
Panel is used to illustrate the
installation. However,
module installation is
identical for all Lighting
Control Panel models.
Load Terminal Block
Figure 1: Installing Modules and Blank Covers
Electrical Specifications
120V Panels:
Operating Voltage:
Number of Circuits:
Minimum Rated Load:
Maximum Rated Load:
(per circuit)
277V Panels:
Operating Voltage:
Number of Circuits:
Minimum Rated Load:
Maximum Rated Load:
(per circuit)
Common Specifications:
Supported Load Types:
Transition Time:
Ambient Operating Temp:
Relative Humidity:
120VAC, 50/60Hz
74170 - 2 Circuits
74171 - 2 Circuits
74190 - 4 Circuits
0.5W (per circuit)
74170 - 1800VA
74171 - 2000VA
74190 - 1000VA
277VAC, 50/60Hz
74274 - 2 Circuits
74295 - 4 Circuits
0.5W (per circuit)
74274 - 2000VA
74295 - 1000VA
Incandescent, Inductive,
Magnetic Low Voltage,
Electronic Low Voltage
800μS (Rise or Fall)
independent of load size
Natural convection
0 to 40 degrees C
5 to 95% (non-condensing)
Tel: 214-647-7880 | Fax: 214-647-8031
©2011 Philips Group
P/N: 85-6197A
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