Advertisement
CR7075 TWO-STAGE LIGHTING CONTROLLER
OPERATION
In many applications, outdoor cosmetic lighting and parking lot
lighting activate either simultaneously or with independent
controllers by means of a time of day clock with a photocell
override. The photocell override turns on lighting during
abnormal weather conditions (such as overcast sky).
NOTE: Overriding the time of day feature with a photocell
controller provides optimum lighting control, but does
not maximize energy savings.
The Two-Stage Lighting Controller overcomes the energy
saving and calibration deficiencies mentioned above. Each
stage functions separately to control the on/off times of the
outdoor cosmetic and parking lot lighting.
NOTE: At the time of installation, one can operationally
check the photocell by covering the lens with their
hand from a distance of a few inches.
IMPORTANT
Calibration is accomplished by setting light level
potentiometers to turn the lights on at the user-
determined ambient light level.
After a period of time, the photocell characteristics can
change due to accumulation of airborne particles on the lens.
Certain environmental conditions (such as high humidity
levels) can accelerate this accumulation. This can require
changing the light level potentiometer settings. (Refer to the
Checkout section for calibration instructions.)
Typical Sequencing
The following is an example of a typical on/off sequence.
NOTES:
—
Refer to Fig. 8 for sequence of operation.
—
For 24-hour stores, lights simply remain on unless
sufficient light exists to warrant their shut-off. As
operation in such an arrangement depends only
on the photocell, TOD override need only operate
on a manual basis.
63-2180—1
Typical Evening Start-up
As ambient light level decreases, cosmetic lighting (stage 1)
turns on first. As ambient light level decreases further, parking
lot lights (stage 2) turn on. Both turn off after the business
closes using a separate time of day clock. If desired,
independent TOD override for each stage allows turning off
one stage at a different time than the other.
DECREASING LIGHTING CONDITIONS
LIGHT
INTENSITY
LOW
STAGE 2
SETPOINT
(ADJUSTABLE)
STAGE 1
SETPOINT
(ADJUSTABLE)
HIGH
M1045
Fig. 8. Sequence of operation.
Typical Morning Start-up
Both cosmetic and parking lot lighting turn on with the time of
day clock. If desired, independent TOD override for each
stage allows turning on one stage at a different time than the
other. As ambient light level increases, the parking lot lights
(stage 2) turn off first and the cosmetic lighting (stage 1) turns
off last as the ambient light level increases further.
6
(SUNSET)
STAGE 2 - ON
STAGE 1 - ON
TIME
DELAY
TIME
DELAY
TIME
Advertisement
