®
Photocontroller and Photocells
♦ Control module and photocells for daylighting
control of interior and exterior lighting
♦ Four photocell types for specific application settings
♦ Adjustable setpoints for deadband
♦ Three-minute time delay
♦ Three isolated outputs
♦ Master switch input
♦ Photocell lockout
♦ One year warranty
Component
Information
The Watt Stopper’s basic photocontroller works with a range of photocells to add daylighting
control capability to lighting control panels. The controller and photocells are compatible
with Smartwired Control and Complete Control panels. In addition to the controller module
itself (HPCU), there are four different photocells. Each photocell is designed for different
applications, and the user may select the appropriate photocell.
Operation
The photocontroller utilizes a photocell sensor (located either outdoors or indoors, depending on the application) to read light levels and transmit the data to the controller module,
usually located in the lighting control panel. When the light level data received from the
photocell indicates that the setpoint has been reached for a sufficient time, the controller
will switch lighting OFF. Conversely, when light level data from the photocell indicates that
the daylight contribution is not adequate, the controller will switch lighting ON. With the
appropriate photocell, the controller provides daylighting control for interior spaces, atriums, skylights, and exterior lighting.
Features
A Class 2 device, the photocontroller has three outputs that may be connected directly to
relays or to a programmable input or channel. The module features a three-minute time
delay and adjustable switching ranges that allow adjustment for high and low setpoints of
the deadband.
Applications
Users may select among four different photocells to tailor the control to the application
more precisely. The HPCSIN photocell provides monitoring of daylight contributions in
interior spaces. The HPCSOT photocell is designed for exterior use and the control of
exterior lighting. For atrium spaces, users would select the HPCSAT photocell, which is
capable of sensing the brightness of ceiling spaces without being exposed to direct daylight. In applications that include skylights, the HPCSKY photocell would be the suitable
choice, as it is designed for mounting in the skylight itself and is capable of monitoring
daylight levels between 1,000-10,000 footcandles. By providing a selection of photocells
that work with the Photocontroller, users are able to take advantage of energy savings
through using the abundance of daylight.
Photocontroller Technical Information
Specifications
Ordering
Information
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Compatible with The Watt Stopper Smartwired Control and Complete Control panels
User-selectable footcandle range from 0 - 10,000 for controller module (HPCU)
Three isolated outputs each capable of driving up to three relays or an intelligent input
Controller module mounts in any Watt Stopper interior or accessory enclosure
Choice of four photocell sensors: interior, exterior, atrium, or skylight sensor
User-adjustable deadband of two footcandles
Three-minute time delay
Master switch input for temporarily overriding all outputs
Lockout switch for disabling sensor during unoccupied periods
One year warranty
Catalog No.
Description
Footcandle Range
HPCU
Photocontroller
HPCSIN
Indoor Photocell
HPCSOT
Outdoor Photocell
HPCSAT
Atrium Photocell
100-1000
HPCSKY
Skylight Photocell
1000-10,000
Unit Layout
10-100
1-10 (parking lot and security lighting)
1
24VAC
DELAY ENABLE
OFF
2
Layout of Photocontroller Unit
COM
RED
ON
BLACK
RANGE SELECTOR
3
6
7
Photocell sensor input terminals
Delay enable switch (ON=enable)
3
Range selector switch
(1-10/10-100/100-1000/1000-10,000 FC)
8
Master switch input terminals
4
High level adjustment & LED
9
Relay output terminals (3 sets)
5
Low level adjustment & LED
1
2
RED
9
BLACK
RED
4
4
3
2
1
5 6 7
BLACK
8
9
10
MASTER
SWITCH
HIGH
4
5 6 7
3
2
1
5
8
9
10
ON-RED
LOW
24 VAC power supply terminals
Photocell sensor enable switch
input terminals
8
OFF-BLK
COMMON
PHOTOCELL
BLACK
WHITE
RED
BLUE
SENSOR
ENABLE
DRAIN
6
Wiring &
Installation
ON
COM
7
Photocontroller - HPCSIN Photocell Wiring
Photocontroller Wiring Diagram
24 VAC power supply
24VAC
COM
DELAY ENABLE
OFF
0.375" diameter
through hole
RED
ON
BLACK
RANGE SELECTOR
Ceiling
RED
BLACK
LINE
RED
RED
5 6 7
MASTER
SWITCH
ON-RED
ON-RED
COM
COMMON
RED
WHITE
RED
BLUE
DRAIN
SENSOR
ENABLE
ON
COM
RANGE SELECTOR
OR …
OFF-BLK
BLACK
Photocell
ON
MASTER
SWITCH
BLACK
LOW
PHOTOCELL
Photocontroller
24VAC
8
9
10
DELAY ENABLE
5 6 7
Relay (typical of three)
BLACK
8
9
10
HIGH
4
3
2
1
1
OFF
4
3
2
1
BLACK YELLOW WHITE
LOAD
OFF-BLK
RED
BLACK
COMMON
SPST maint.
master switch
SPDT mom.
master switch
RED
4
3
2
1
5 6 7
BLACK
8
9
10
MASTER
SWITCH
HIGH
4
3
2
1
5 6 7
8
9
10
ON-RED
LOW
OFF-BLK
COMMON
To photocell sensor
Optional
Shield
PHOTOCELL
Photocontroller - HPCSOT Photocell Wiring
Photocell
BLACK
WHITE
RED
Weathertight
Junction Box
Photocell
Photocontroller
24VAC
COM
DELAY ENABLE
OFF
Photocontroller
RED
ON
24VAC
5 6 7
5 6 7
RED
BLACK
BLACK
8
9
10
RED
MASTER
SWITCH
HIGH
4
3
2
1
RED
BLACK
RANGE SELECTOR
4
3
2
1
ON
RED
DELAY ENABLE
RANGE SELECTOR
RED
BLACK
COM
OFF
BLACK
8
9
10
ON-RED
4
3
2
1
5 6 7
BLACK
8
9
10
MASTER
SWITCH
HIGH
LOW
OFF-BLK
COMMON
4
3
2
1
5 6 7
8
9
10
ON-RED
LOW
OFF-BLK
COMMON
Pub. No. 13601
DRAIN
SENSOR
ENABLE
ON
COM
Photocontroller - HPCSAT Photocell Wiring
0.5" Threaded Inlet
The Watt Stopper®, Inc.
BLUE
SPST maintained switch (optional)
PHOTOCELL
BLACK
WHITE
RED
BLUE
DRAIN
SENSOR
ENABLE
ON
COM
PHOTOCELL
BLACK
WHITE
RED
BLUE
DRAIN
SENSOR
ENABLE
ON
COM