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120V/277V PowerSpec® HDF Dimmer Module Models: 74174 / 74175 / 74194 / 74271 / 74291
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 PowerSpec® HDF Dimmer Module
Installation & Operation Guide
Description The A21 PowerSpec® HDF Dimmer Modules offer reliable dimming of Lightolier® Controls Powerspec® HDF high performance fluorescent dimming ballasts. 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 (74181)
Screw (4)
Focus Button & Status LEDs
Installation 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 first. 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 HDF Control wire (tan or red depending on ballast) to screw terminal on HDF module (Figure 2). (Circuit #1 on module will be top screw.) Tighten screw to a torque of 5 in-lbs. Connect the Black wire to Hot and the White wire to Neutral. Step 8. Close panel front cover.
Operation 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. Red LED
Green LED
Off
Off
Normal
Off
On
Focus Mode (controlled at dimmer)
On
Off
Communication Error
Philips Strand Lighting 10911 Petal Street Dallas, TX 75238 USA
Condition
Dimmer Module
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 Terminal Shorting Plug
DETAIL
Figure 1: Installing Modules and Blank Covers DUAL BALLAST
QUAD BALLAST
Control Wiring: Dimmer A
Control Wiring: Dimmer A Dimmer B Dimmer C
Dimmer B
Dimmer D
MODULE FRONT VIEW
MODULE FRONT VIEW
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): 74174: 1800VA / 74175: 2400VA Operating Voltage: 120VAC, 50/60Hz Number of Circuits: 4 Min Rated Load (per circuit): 35W Max Rated Load (per circuit): 74194: 2000VA Operating Voltage: 277VAC, 50/60Hz Number of Circuits: 2 Min Rated Load (per circuit): 35W Max Rated Load (per circuit): 74271: 4000VA Operating Voltage: 277VAC, 50/60Hz Number of Circuits: 4 Min Rated Load (per circuit): 35W Max Rated Load (per circuit): 74291: 4000VA Supported Loads: Lightolier® Controls PowerSpec® HDF 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 www.strandlighting.com ©2011 Philips Group P/N: 85-6237
