85-6231 A21 Module Manual

85-6231 A21 Module Manual
120V/277V Relay Module
Models: 74178 / 74179 / 74195 / 74196 / 74273 / 74293
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 Relay Module
Installation & Operation Guide
The A21 Relay Modules offer economical and reliable switching of non-dim loads
including lighting, signs, and motors. The modules utilize rugged relays and feature
dual-color status indicators, and focus buttons for manual operation and testing.
Screw (4)
All A21 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
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)
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.
Focus Button
& Status LEDs Relay
Load Terminal Block
To install modules:
NOTE: The A21 9-Module
Panel is used to illustrate
the installation. However,
module installation is identical for all Lighting Control Panel models.
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 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 module will not
operate properly if the shorting plug is left in circuit.
Step 6. Gently insert module into Lighting Control Panel with relays facing you.
Secure module using four screws (provided). 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. Close panel front cover.
A21 Relay 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
Miswire to Line
10911 Petal Street
Dallas, TX 75238 USA
Figure 1: Installing Modules and Blank Covers
Electrical Specifications
Operating Voltage: 120VAC, 50/60Hz
Number of Circuits:
74178 / 74179: 2
74195 / 74196: 4
Min Rated Load (per circuit): 0.5W
Max Rated Load (per circuit):
74179 / 74195: 2400W
74178 / 74196: 1800W
Operating Voltage: 277VAC, 60Hz
Number of Circuits:
74273: 2
74293 : 4
Min. Rated Load (per circuit): 0.5W
Max Rated Load (per circuit):
74273 / 74293 : 4000W
Supported Load Types: Incandescent, Inductive,
Magnetic Low Voltage, Electronic Low Voltage, HID *
Cooling: Natural convection
Ambient Operating Temp: 0 to 40 degrees C
Relative Humidity: 5 to 95% (non-condensing)
Strand Lighting
When controlling HID lamps, derating of the relay circuit by 20% is required.
Tel: 214-647-7880 | Fax: 214-647-8031
©2011 Philips Group
P/N: 85-6231
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