Hardware Installation
SCX 920 Installation Guide 3
Controller Dimensions and Weight
Each SCX 920 is 14.7 × 10.7 × 2.75 in. and weighs 8 lbs.
Power Requirements
Caution
The SCX 920 should receive power from its own independent,
unswitched circuit.
You can select a power supply voltage of 24 V, 120 V, or 240 V. You
receive it set to 115 V. Instructions for selecting the power supply you
want are included with the installation.
Voltages you can select are as follows (each uses a 3 A slow blow fuse):
• 24 VAC +/– 20% 50/60 Hz (for smoke control applications
24 VAC +10/– 15% 60 Hz)
• 120 VAC +/– 20% 50/60 Hz (for smoke control applications
120 VAC +10/– 15% 60 Hz)
• 240 VAC +/– 20% 50/60 Hz (for smoke control applications
240 VAC +10/– 15% 60 Hz)
The SCX 920 consumes 32 VA of power.
Cable Limitations
The maximum cable length for all buses is 4,000 ft at 19,200 baud (up
to 32 Infinet controllers). You can extend buses beyond 4,000 ft or put
more than 32 Infinet controllers on less than 4,000 ft by using the
InfiLink 200 amplification module.
Note
You must use shielded cables for Infinet to ensure compliance with the
Class A FCC limits and to provide reliable communications.
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