Leviton Z-MAX Series, Quick Programming Manual

Page: 19 / 40

A photocell is a device that receives light, and provides a 0-10Vdc output pro-
portional to the amount of light received. The term foot-candle is a term we use
to describe the amount of light received at a point, in this case by a photocell.
Since the amount of light in a space can vary greatly from a little bit of light (an
office room) to a lot of light (a skylit lobby) various photocells specifically cali-
brated to the amount of light they may receive exist.
In order to configure your photocell to work with Z-MAX, you must first know a
little bit about how your photocell is calibrated. The calibration is expressed by
looking at the maximum amount of foot-candles that your photocell is calibrat-
ed to receive. This information can usually be found written on the photocell
itself, or in its accompanying literature. The photocells Leviton sells and their
calibration points are as follows:
Photocell Types and Ranges
Also note that in the above table we’ve indicated the amount of “foot-candles
per volt” which is information you will need in the setup process. This number
can be calculated simply by dividing the maximum number of foot-candles by
10 Volts.
For example, a photocell which is calibrated to a maximum of 250 foot-
candles, 250Fc/10V = 25FC/V.
Photocell Input
16
PHOT
OCELL
INPUT
Part No. Max FC FC/Volt (program into cabinet, see Step 33)
ODCOP 70 7
PCIND 100 10
PCOUT 250 25
PCSKY 2000 200
PCATR 2500 250
WEB
VERSION