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a-2000 User Guide
a-2000
Page 77
Dimmer Cabinets with Digital Controls
Revision G November 2006
Power Considerations for Control Systems
The control system should be carefully planned to take these important issues
into consideration:
•
Power Supply for connected devices
•
Wire Size for Power Runs
On systems where full factory drawings have been provided, our Applications
Engineering department has already managed these calculations for you so you
need only follow the instructions on the system drawings. However, on any
installation where factory drawings were not provided, the information contained
within this guide must be followed to ensure that all of your devices operate
properly and without failures or complete in-operability.
This chapter contains information which applies to many Leviton
products and is not necessarily limited to the product which is primarily
included in this manual. There may be information in this chapter which is
not relevant to your particular installation. If you have questions about
ANY information contained herein, please immediately contact our
Technical Services Department prior to proceeding with installation.
Terminology
Please review these definitions which are used throughout this chapter:
•
Power Supply
or
Supply
- references a device which supplies power to other
devices
•
Power Control Device (PCD)
- refers to a device which controls power.
Examples of Devices in the Leviton product line which control power are
dimming racks, relay panels, A-2000, i-series e, Z-MAX, etc. Generally PCD’s
also supply a certain amount of power to connected low voltage control devices
•
Control Devices
or
Low Voltage Control Devices
or
Device
- these terms all refer
to control devices which connect to a Power Control Device (PCD). These
devices could be simple low voltage switches, Occupancy Sensors, or D8000
control stations
•
Luma-Net
- is one of our network lighting control protocols. Luma-Net is an RS-
485- based control protocol used by D8000 & D4200 control devices. Many of
our PCD (Power Control Device) products have a direct data connection for a
Luma-Net device. All Luma-Net Control Devices require power in one form or
another. This power generally accompanies the data wires
•
Unit Load -
(1) Unit load is defined as 25mA, or 0.025A. It is an arbitrary
definition by Leviton and was created to simplify power calculations
Power Requirements & Maximum Run Length
Each Control Device used in your system has a different load (draw) and each
PCD can support a different total load (supply.) The steps for determining the
total load of your network and verifying that the supply is sufficient are simple--or
at least logical:
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