Power Considerations for Control Systems
Z-Max Advanced Programming & Systems Design Guide rac00-sdg
Revision A:11/2005 Page 117
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
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