Legrand Photocontroller and Photocells (HPC) Installation guide

Brand: Legrand

Model: Photocontroller and Photocells (HPC)

Type: Installation guide

Installation Instructions

Inc.

HPCU

Photocell Controller Unit

Installation and Setup

The HPCU is the control/calibration module for a

daylighting controller.

A complete assembly would consist of the control

module and one of the following remotely mounted

photodiode daylight sensors:

• Indoor Sensor (HPCSIN)

• Outdoor Sensor (HPCSOT)

• Atrium Sensor (HPCSAT)

• Skylight Sensor (HPCSKY)

For normal installations, the sensor is wired to the

control module with 4-conductor 20 AWG HOSW4

sensor wire.

Features

• Control module/sensor combinations designed for

the speciﬁc daylighting application

• For each combination, calibration setpoints read out

directly in footcandles

• Adjustable footcandle setpoints for both high- and

low-trip to create a dead band

• Switch-enabled time-delay of 3 minutes

• Lockout switch for disabling the sensor

• Three separate relay outputs, each capable of

driving up to three relays, or triggering the input to

an intelligent device such as the HBIC12BC

• Local override of each output at relay panel

• Master control of all three outputs at controller

Before proceeding, read the installation instructions

inside. If you have questions, call our Service

Team at: 888-852-2778.

HPCU Photocell Controller Unit — Installation and Setup

Figure 1 – HPCU Photocell Controller Unit

CAUTION: Power should always be off

when wiring the panel. Before powering

up to test the unit, take care to protect

yourself from contact with wiring in

the line-voltage section of the panel.

Mount the HPCU

The HPCU attaches to the mounting

plate in an HINxxyxxBC interior or in the

low-voltage section of a standard

HSMC2 panel.

Connect Low-Voltage Wiring

Wire to the 24 VAC power supply and

connect Red (ON) and Black (OFF)

outputs to the corresponding inputs on

the relays to be controlled.

Connect Photosensor

Connect the Red/Black/White/Blue wires

from the photocell sensor to the corre-

sponding HPCU photocell terminations.

Connect the optional shield when

installing the sensor in locations subject

to heavy EMI or RF interference.

Power Up and Calibrate

See the instruction on the next page.

Connect Optional Overrides

Connect a 3-wire momentary or 2-wire

maintained switch to the Master Switch

inputs. Connect a 2-wire, single pole,

isolated contact switch to the Photocell

Enable inputs.

HIGH

LOW

RED

BLACK

RED

BLACK

RED

BLACK

ON-RED

OFF-BLK

COMMON

MASTER

SWITCH

SENSOR

ENABLE

ON COMBLACK WHITE RED BLUE DRAIN

PHOTO-

CELL

DELAY ENABLE RANGE SELECTOR

24VAC COM

OFF ON

HIGH

LOW

RED

BLACK

RED

BLACK

RED

BLACK

ON-RED

OFF-BLK

COMMON

MASTER

SWITCH

SENSOR

ENABLE

ON COMBLACK WHITE RED BLUE DRAIN

PHOTO-

CELL

DELAY ENABLE RANGE SELECTOR

24VAC COM

OFF ON

24 VAC POWER SUPPLY

YELLOWRED BLACK WHITE

RELAY (TYPICAL OF THREE)

TO PHOTOCELL SENSOR

OPTIONAL

SHIELD

SPST MAINTAINED SWITCH (OPTIONAL)

LINE

LOAD

SPDT MOM.

MASTER SWITCH

ON-RED

OFF-BLK

COMMON

MASTER

SWITCH

SPST MAINT.

MASTER SWITCH

OR …

1 24 VAC Power Supply Terminals

2 Delay Enable Switch (ON = Enable)

3 Range Selector Switch (1-10 / 10-100 / 100-1K / 1K-10K FC)

4 High Level Adjustment and LED

5 Low Level Sdjustment and LED

6 Photocell Sensor Input Terminals

7 Photcell Sensor Enable Switch Input Terminals

8 Master Switch Input Terminals

9 Relay Output Terminals (3 sets)

Figure 2 – HPCU Photocell Controller Unit Wiring Diagram

Calibration

HIGH level at “6”. (The HIGH level is

normally set at least two ticks higher

than the LOW level). The adjustment

can be optimized upon installation.

Method B: When the desired sensor

light level not known …

This method can be used for all

sensors, but it is typical for HPCSAT

and HPCSKY sensors.

This approach requires that you wait

until the time of day when you want

the lights to turn ON:

1.Start with the lights OFF, and the

LOW setpoint at 0, the HIGH at 10.

2.Raise the LOW setpoint until its LED

turns ON.

3.Turn ON the lights (use the Master

Switch input to turn OFF the relays).

4.Decrease the HIGH setpoint until

the HIGH LED comes ON, then

raise it to the next tick — now the

HIGH LED turns OFF. There should

always be at least 2 ticks between

the HIGH and LOW setpoints.

Step 4

Move the DELAY ENABLE switch to

the ON position

HPCSIN: When switching lighting in an

office or classroom, you should err on

the side of providing too much light.

There are three factors to consider in

calculating the minimum setting:

1.Target footcandle level … the

minimum lighting level when the

shed lights are OFF. Example: 60 fc

at the task in an office or classroom.

2.Fraction of lighting shed … the

fraction of the lamps or fixtures

turned off by the HPCU. Example:

Half of the lamps within the daylight

zone (controlled zone).

3.Reflectance of task surface … the

fraction of light which will be seen by

the ceiling mounted sensor com-

pared to that measured at the

workplane. (This is typically between

20% for dark furnishing and 50% for

light furnishings.) Example: Class-

room with 40% floor cavity reflec-

tance.

Use this formula to calculate the

minimum setting:

(target footcandles) x ( 1 + fraction of

lamps to be shed) x (reflectance)

Example: 60 footcandles x 1.5 x 0.4 =

36 footcandles. Using the 10-100

RANGE on the HPCU, we would then

set the LOW level scale at “4” and the

SENSOR TYPE USE SELECTION RANGE

HPCSIN Indoor office or classroom Range: 10-100

Scale setting of 1 = 10 fc

10 = 100 fc (each tick = 10 fc)

HPCSOT Parking lot and security lighting Range: 1-10

Scale setting of: 1 = 1 fc

10 = 10 fc (each tick = 1 fc)

Alternate: Canopy lights and signage Alternate range: 100-1000

Scale setting of: 1 = 25 fc

10 = 250 fc (each tick = 25 fc)

HPCSAT Indoor, atrium Range: 100-1000

Scale setting of: 1 = 100 fc

10 = 1000 fc (each tick = 100 fc)

HPCSKY Indoor, skylight Range: 1000-10,000

Scale setting of: 1 = 1000 fc

10 = 10,000 fc (each tick = 1000 fc)

HPCU Photocell Controller Unit — Installation and Setup

Step 1

Move the DELAY ENABLE slide switch

to the OFF position

This will cause the control module to

respond immediately to changes in

setting levels or to changes in the lighting

level as seen by the sensor.

Step 2

Set the RANGE SELECTOR switch

Set the switch to the appropriate range

according to the table at the bottom of

this page.

Step 3

Set the HIGH and LOW setpoints

If you know the target light level at the

sensor, use Method A; if not, use Method B.

Method A: When the desired sensor

light level known …

HPCSOT, HPCSAT and HPCSKY: If

you know the target light level for the

sensor listed above, set the HIGH

level at 1 tick higher than the target

and the LOW level at 1 tick less than

the target. For example, if you wanted

to set an atrium sensor at 400

footcandles, the RANGE would be

100-1000, the HIGH setting = 5, the

LOW setting = 3. This would turn the

lights ON at 300 footcandles and OFF

at 500 footcandles.

Panel Division 888-852-2778 INHPCU 061501

not change state until you leave the dead

band on the high side. At that point, both

LEDs will go off and the relays will be

turned off.

Coming back down the curve at the end

of the day, the high level LED will come

on as we enter the dead band, but no

relay actions occur. Only when we leave

the dead band on the low side will both

LEDs come on and the relays be turned on.

To summarize the HPCU output actions:

• Both LEDs on … HPCU turns on relays

• Both LEDs off … HPCU turns off relays

• One LED on… no action (light level is

in dead band)

Automatic Response… Delay Enabled

This is the normal operating mode for a

HPCU. The actions are the same as

outlined above except that when the

delay is enabled, the unit will wait three

minutes after both LEDs come on (or go

off) to change the state of the relay. This

reduces the possibility of short duration

fluctuations in light level (such as a cars

headlights hitting an outdoor parking lot

sensor) causing nuisance switching of

the lighting circuits.

Operation

Manual Override … Individual Output

Each of the three output channels is

isolated allowing you to directly override

the associated relay with a local low

voltage switch (see the instructions

provided with your relay panel).

Note, however, that this override is not

permanent. For example, if an individual

uses his local switch to turn a light back

on which the daylight sensor has turned

off, the next time the sensor turns off its

output channels in response to increasing

light levels, it will also turn that relay off.

Manual Override … All Outputs

The Master Switch turns all three channels

on and off. As with the individual output

override, this override is not permanent.

Automatic Response Disabled

Closing the “Photocell Enable” contacts

“disconnects” the sensor from the HPCU

and the unit will no longer respond to

changes in the sensed light level. The

Manual Override functions will still

operate. This function is normally used to

keep the unit from controlling the lights

during unoccupied periods.

Automatic Daylighting Response

The HPCU automatically pulses up to

three lighting circuits in response to

changes in natural daylight. The pulse is

a 0.5 second dry contact closure

compatible with Watt Stopper latching

style relays or intelligent inputs.

The HPCU has two setpoints … a high

level and a low level. These dictate the

ON/OFF operation of the relay outputs in

response to changing light levels (see

Figure 3).

The region between the high and low

setting is referred to as a “dead band”

because no relay actions will take place

when the light level is in this region. (The

dead band eliminates the possibility of

the controller going into an oscillating

mode: the sensor sheds the lamps

based on adequate lighting, whereupon

the new light level is so low that the

sensor activates the lamps on again.)

With the light level below the dead band,

both LEDs will be on and the relays will

be on. As the light levels increase and

you enter the dead band, the low level

LED will go off; however, the relays will

MAXIMUM

DAYLIGHT

LEVEL

HIGH

SETPOINT

LOW

SETPOINT

BOTH LEDs OFF

RELAYS OFF

DEAD BAND

TIME

BOTH LEDs ON

RELAYS ON

HIGH LED OFF

…RELAYS TURNED OFF

HIGH LED ON

…NO RELAY ACTION

LOW LED OFF

…NO RELAY ACTION

LOW LED ON

…RELAYS TURNED ON

Figure 3 – Daylighting Controller Operation

HPCU Photocell Controller Unit — Installation and Setup

Installation Instructions

Inc.

HPCSAT

Atrium Photocell Sensor

Installation and Setup

The HPCSAT is an indoor photodiode light level

sensor for a daylighting contoller.

A complete assembly consists of the sensor and a

remotely mounted HPCU photocell controller unit. For

normal installations, the sensor is wired to the controller

with 4-conductor 20 AWG (Red/Black/White/Blue)

HOSW4 low-voltage sensor wire.

Most applications do not require that the sensor be

shielded. However, the optional shield should be used

when the sensor is installed in industrial locations or

those subject to heavy electromagnetic (EMI) or radio

frequency (RF) interference.

The HPCSAT and HPCU are designed as a matched

set to provide direct light level readouts over a range

of 100-1000 footcandles — the range normally

encountered in most atrium daylighting applications.

Features

• Translucent dome with a 180° ﬁeld of view provides

integrated brightness measurement

• Incorporates photodiode technology to allow linear

response over a 100-1000 fc range with direct

readout of the measured light levels

• Mounts to standard

⁄2

conduit or knockout

• Class 2, DC low-voltage wiring

Before proceeding, read the installation instructions

on the reverse side. If you have questions, call our

Service Team at: 888-852-2778.

Panel Division 888-852-2778 INHPCSAT 061501

Installation

Locate the Sensor

The sensor should be located where it

has a clear view of the sky as seen from

the atrium space. In perimeter window

walls, the unit should be mounted

looking out of the window. (The object is

to provide an indication of the level of

daylight entering the space — not to

measure the light levels in the occupied

areas. Mount to

⁄2

conduit. In atriums,

the unit is mounted vertically with the

dome facing up. In window wall applica-

tions, it is mounted horizontally looking

out of the window.

Wire from Sensor to HPCU

See the typical wiring diagram below.

Conform to National, State and Local

codes.

Figure 2 – HPCSAT Sensor Wiring

Figure 1 – HPCSAT Sensor Location

Atrium Application

ALL ATRIUM LIGHTS PLUS “SHEDABLE” LAMPS

WITHIN “D” TO PARTITIONS OR 15 FEET.

SEE

DIAGRAM

BELOW

Windowed Wall

Application

6" MIN.

HIGH

LOW

RED

BLACK

RED

BLACK

RED

BLACK

ON-RED

OFF-BLK

COMMON

MASTER

SWITCH

SENSOR

ENABLE

ON COMBLACK WHITE RED BLUE DRAIN

PHOTO-

CELL

DELAY ENABLE RANGE SELECTOR

24VAC COM

OFF ON

UNILET CONDUIT OUTLET

SPLICE

OPTIONAL

SHIELD

HPCU

HPCSAT

FOR DISTANCES UP TO 250 FT.

USE 4-CONDUCTOR 20 AWG HOSW4

FOR DISTANCES 250 –1000 FT.

USE 4-CONDUCTOR 18 AWG

FOR INDUSTRIAL ENVIRONMENTS

OR LOCATIONS WITH HIGH EMI

USE SHIELDED 4-CONDUCTOR 20 OR 18 AWG

CATALOG NUMBER Lighting Control Panel Product — Installation and Setup

Installation Instructions

Inc.

HPCSIN

Indoor Photocell Sensor

Installation and Setup

The HPCSIN is an indoor photodiode light level

sensor for a daylighting contoller.

A complete assembly consists of the sensor and a

remotely mounted HPCU photocell controller unit. For

normal installations, the sensor is wired to the controller

with 4-conductor 20 AWG (Red/Black/White/Blue)

HOSW4 low-voltage sensor wire.

Most applications do not require that the sensor be

shielded. However, the optional shield should be used

when the sensor is installed in industrial locations or

those subject to heavy electromagnetic (EMI) or radio

frequency (RF) interference.

The HPCSIN and HPCU are designed as a matched

set to provide direct light level readouts over a range

of 10-100 footcandles — the range normally encoun-

tered in most ofﬁce and classroom applications.

Features

• Fresnel lens with a 60° cone of response, which

reduces false triggering caused by daylight reﬂected

from the ﬂoor

• Incorporates photodiode technology to allow linear

response over a 10-100 fc range with direct readout

of the measured light levels

• Simple ceiling mount requires only a

⁄8

penetration

hole in ceiling

• Class 2, DC low-voltage wiring

Before proceeding, read the installation instructions

on the reverse side. If you have questions, call our

Service Team at: 888-852-2778.

Panel Division 888-852-2778 INHPCSIN 061501

HPCSIN Indoor Photocell Sensor — Installation and Setup

Installation

Locate the Sensor

The sensor should be located near the

center of the daylit zone to be controlled.

However, it must also be mounted so

that a window is not within its viewing

angle. The diagram to the right shows

minimum distances. The sensor “sees” a

circle on the ﬂoor with a diameter

approximately equal to the height of the

ceiling. Thus, with a ceiling height of 10

feet, the sensor should be mounted ﬁve

feet from the window.

Wire from Sensor to HPCU

See the typical wiring diagram below.

Conform to National, State and Local

codes.

Figure 2 – HPCSIN Sensor Wiring

HEIGHT

WINDOW

⁄

HEIGHT

SEE DIAGRAM BELOW

HIGH

LOW

RED

BLACK

RED

BLACK

RED

BLACK

ON-RED

OFF-BLK

COMMON

MASTER

SWITCH

SENSOR

ENABLE

ON COMBLACK WHITE RED BLUE DRAIN

PHOTO-

CELL

DELAY ENABLE RANGE SELECTOR

24VAC COM

OFF ON

0.375" DIAMETER

THROUGH HOLE

HPCU

FOR DISTANCES UP TO 250 FT.

USE #20/4 HOSW4

FOR DISTANCES 250–1000 FT.

USE #18/4

FOR INDUSTRIAL ENVIRONMENTS

WITH HIGH EMI

USE SHIELDED #20/4 OR #18/4

HPCSIN

CEILING

OPTIONAL

SHIELD

Figure 1 – HPCSIN Sensor Location

Installation Instructions

Inc.

HPCSKY

Skylight Photocell Sensor

Installation and Setup

The HPCSKY is an indoor photodiode light level

sensor for a daylighting contoller.

A complete assembly consists of the sensor and a

remotely mounted HPCU photocell controller unit. For

normal installations, the sensor is wired to the controller

with 4-conductor 20 AWG (Red/Black/White/Blue)

HOSW4 low-voltage sensor wire.

Most applications do not require that the sensor be

shielded. However, the optional shield should be used

when the sensor is installed in industrial locations or

those subject to heavy electromagnetic (EMI) or radio

frequency (RF) interference.

The HPCSKY and HPCU are designed as a matched

set to provide direct light level readouts over a range

of 1,000-10,000 footcandles — the range normally

encountered in skylight applications.

Features

• Translucent dome with a 180° ﬁeld of view provides

integrated brightness measurement

• Incorporates photodiode technology to allow linear

response over a 1,000-10,000 fc range with direct

readout of the measured light levels

• Mounts to standard

⁄2

conduit or knockout

• Class 2, 24 DC low-voltage wiring

Before proceeding, read the installation instructions

on the reverse side. If you have questions, call our

Service Team at: 888-852-2778.

Panel Division 888-852-2778 INHPCSKY 061501

HPCSKY Skylight Photocell Sensor — Installation and Setup

Atrium Application

ALL ATRIUM LIGHTS PLUS “SHEDABLE” LAMPS

WITHIN “D” TO PARTITIONS OR 15 FEET.

SEE

DIAGRAM

BELOW

Windowed Wal

Application

Installation

Locate the Sensor

The sensor should be located in the

center of the skylight at least 12 inches

away from the sidewall. Mount to to

⁄

conduit. The unit is mounted vertically

with the dome facing up.

Wire from Sensor to HPCU

See the typical wiring diagram above.

Conform to National, State and Local

codes.

Figure 2 – HPCSKY Sensor Wiring

Figure 1 – HPCSKY Sensor Location

HIGH

LOW

RED

BLACK

RED

BLACK

RED

BLACK

ON-RED

OFF-BLK

COMMON

MASTER

SWITCH

SENSOR

ENABLE

ON COMBLACK WHITE RED BLUE DRAIN

PHOTO-

CELL

DELAY ENABLE RANGE SELECTOR

24VAC COM

OFF ON

UNILET CONDUIT OUTLET

SPLICE

HPCU

HPCSKY

OPTIONAL

SHIELD

FOR DISTANCES UP TO 250 FT.

USE 4-CONDUCTOR 20 AWG HOSW4

FOR DISTANCES 250 –1000 FT.

USE 4-CONDUCTOR 18 AWG

FOR INDUSTRIAL ENVIRONMENTS

OR LOCATIONS WITH HIGH EMI

USE SHIELDED 4-CONDUCTOR 20 OR 18 AWG

Installation Instructions

Inc.

HPCSOT

Outdoor Photocell Sensor

Installation and Setup

The HPCSOT is an outdoor photodiode light level

sensor for a daylighting contoller.

A complete assembly consists of the sensor and a

remotely mounted HPCU photcell controller unit. For

normal installations, the sensor is wired to the controller

with 4-conductor 20 AWG (Red/Black/White/Blue)

HOSW4 low-voltage sensor wire.

Most applications do not require that the sensor be

shielded. However, the optional shield should be used

when the sensor is installed in industrial locations or

those subject to heavy electromagnetic (EMI) or radio

frequency (RF) interference.

The HPCSOT and HPCU are designed as a matched

set to provide direct light level readouts over a range

of 1-10 footcandles — the range normally encoun-

tered in most parking lot and security lighting applica-

tions. An alternate setting provides a range of 25-250

footcandles, for controlling signage and canopy

lighting.

Features

• Completely encased in optically-clear epoxy resin

for weather-tight operation

• Hooded aperture for shielding from direct sunlight

• Incorporates photodiode technology to allow linear

response over a 1-10 fc range with direct readout of

the measured light levels

• Alternate setting with a linear response over a

25-250 fc range

• Stable operation from -20° to 150°F

• Mounts to standard

⁄2

conduit or knockout

• Class 2, DC low-voltage wiring

Before proceeding, read the installation instructions

on the reverse side. If you have questions, call our

Service Team at: 888-852-2778.

Panel Division 888-852-2778 INHPCSOT 061501

HPCSOT Outdoor Photocell Sensor — Installation and Setup

SEE DIAGRAM BELOW

NOTE: INSTALL 12 INCHES ABOVE THE SNOW LINE

PARKING LOT LIGHTING

CANOPY LIGHTING

SIGNAGE

Installation

Locate the sensor

The sensor should be located on the

roof of the building, facing North. The

unit should have an unrestricted view of

the skyline and should not face any

nighttime light sources. Mount to a

⁄2

weathertight junction box.

Wire from Sensor to HPCU

See the typical wiring diagram below.

Conform to National, State and Local

codes.

Note: The HPCSOT is typically used for

all exterior lighting applications — parking

lot, security, signage and canopy/walkway

lighting. The table below summarizes the

recommended initial settings on the

HPCU for each of these applications.

Figure 2 – HPCSOT Sensor Wiring

Figure 1 – HPCSOT Sensor Location

HIGH

LOW

RED

BLACK

RED

BLACK

RED

BLACK

ON-RED

OFF-BLK

COMMON

MASTER

SWITCH

SENSOR

ENABLE

ON COMBLACK WHITE RED BLUE DRAIN

PHOTO-

CELL

DELAY ENABLE RANGE SELECTOR

24VAC COM

OFF ON

HPCU

FOR DISTANCES UP TO 250 FT.

USE 4-CONDUCTOR 20 AWG HOSW4

FOR DISTANCES 250 –1000 FT.

USE 4-CONDUCTOR 18 AWG

FOR INDUSTRIAL ENVIRONMENTS

OR LOCATIONS WITH HIGH EMI

USE SHIELDED 4-CONDUCTOR 20 OR 18 AWG

HPCSOT

WEATHERTIGHT

JUNCTION BOX

0.5" THREADED INLET

OPTIONAL

SHIELD

Typical HPCU Settings

LIGHTING TARGET RANGE LOW HIGH

APPLICATION LIGHT SELECTOR LEVEL LEVEL

LEVEL SWITCH ADJUST ADJUST

PARKING LOT 5 FC 1-10 4 6

CANOPY LIGHTS 50 FC 100-1000 1 3

SIGNAGE 200 FC 100-1000 7 9

Legrand Photocontroller and Photocells (HPC) Installation guide

Legrand Photocontroller and Photocells (HPC) Installation guide

Legrand Photocontroller and Photocells (HPC) Installation guide

Related papers

Other documents