Relay Scanners WR-8812 & WR-8824 Technical Data noncorrosive noncondensing

6 D A = I J= ? JE BJD EI K EJ
EI E @ E? = JA @ > O JD A - , I
= @ A E 8 = ? K L A H+ = = @ =
l
, K C = I HA = O
? A ? JA @ H . .
6 D A L A HHE@ A > K JJ I ? =
? A ? JA @ H . .
M EJD JD A I ? = A H K JF K J
K I A @ > O HA = O I
= @ A E
8 = ? K L A H
+ = = @ =
) K N EE= HO HI M EJ? D E F K J? EH? K EJ
? = K I A = JH= I B H A H@ EBBA HA J
BH JD = JK I A @ J F M A HJD EI K EJ
ON
Relay Scanners
WR-8812 & WR-8824
Technical Data
Relay Outputs
Relay outputs to
switch Douglas
2-wire relays.
Relay outputs
fire in sequence
when switching.
Indicator LEDs
Indicator LEDs
show the
last switching
operation done by
the relay scanner.
Override Buttons
Use override buttons
for convenient
switching at the
relay scanner.
1
2
3
4
5
6
7
8
9
10
11
12
DOUGLAS
RELAY OUTPUTS
l + A ? J K JF K J
J HA @ JA H E = B
, K C = I HA = O
7 I A = , K C = I I M EJ? D
= @ H= = K N EE= HO " 8
I EC = J = ? JK = JA JD EI
K EJJ I M EJ? D = HA = O I
? A ? JA @ H . .
6 D A L A HHE@ A > K JJ I ? =
= I = ? JK = JA JD EI K EJJ
I M EJ? D = HA = O I
? A ? JA @ H . .
4 A = O I ? = = I > A
E @ EL E@ K = O ? JH A @
> O ? A ? JE C = I M EJ? D
J JD A HA = O E F = H= A
M EJD JD A I ? = A H K JF K J
Wh POWER
" 8 ) + # )
Bu 5 = A JH= I B H A H
K I A @ > O HA = O I
OVERRIDE BUTTONS
= @ A E 8 = ? K L A H+ = = @ =
ON
6 D A = I J= ? JE BJD EI K EJ
EI E @ E? = JA @ > O JD A - , I
WR-8812
OFF
= @ A E
8 = ? K L A H
+ = = @ =
Auxiliary Input
Connect auxiliary contacts to
provide a master control.
Use a momentary or
maintained 24VAC signal.
Time clock control is a typical
application for the auxiliary input.
REMOTE MASTER
SWITCH INPUT
) K N EE= HO HI M EJ? D E F K J? EH? K EJ
? = K I A = JH= I B H A H@ EBBA HA J
BH JD = JK I A @ J F M A HJD EI K EJ
) 7 : 1 1) 4 ;
+ 6 4
) F F O " 8 ) +
= E J= E A @ H
A J= HO
ON
24VAC
RETURN
OFF
SWITCH , 7 / ) 5
4 - ) ;
PART No.
WR-8812
12 Relay Scanner
WR-8824
24 Relay Scanner
5 9 16 + 0
9 4 &
H9 4 & #
BLUE
RETURN
1
2
3
4
5
6
7
8
9
10
11
12
Wh POWER
" 8 ) + # )
Bu 5 = A JH= I B H A H
K I A @ > O HA = O I
OVERRIDE BUTTONS
= @ A E 8 = ? K L A H+ = = @ =
ON
6 D A = I J= ? JE BJD EI K EJ
EI E @ E? = JA @ > O JD A - , I
DOUGLAS
RELAY OUTPUTS
l + A ? J K JF K J "
J HA @ JA H E = B
WR-8824
, K C = I HA = O
7 I A = , K C = I I M EJ? D
= @ H= = K N EE= HO " 8
I EC = J = ? JK = JA JD EI
K EJJ I M EJ? D = HA = O I
? A ? JA @ H . .
6 D A L A HHE@ A > K JJ I ? =
= I = ? JK = JA JD EI K EJJ
I M EJ? D = HA = O I
? A ? JA @ H . .
4 A = O I ? = = I > A
E @ EL E@ K = O ? JH A @
> O ? A ? JE C = I M EJ? D
J JD A HA = O E F = H= A
M EJD JD A I ? = A H K JF K J
OFF
DESCRIPTION
WR-8812 & WR-8824 Relay Scanners
Use scanner to switch a group of relays with a master switch.
Each relay in the group can also be controlled by an individual switch.
= @ A E
8 = ? K L A H
+ = = @ =
) 7 : 1 1) 4 ;
+ 6 4
) F F O " 8 ) +
= E J= E A @ H
A J= HO
ON
24VAC
RETURN
13
14
15
16
17
18
19
20
21
22
23
24
REMOTE MASTER
SWITCH INPUT
) K N EE= HO HI M EJ? D E F K J? EH? K EJ
? = K I A = JH= I B H A H@ EBBA HA J
BH JD = JK I A @ J F M A HJD EI K EJ
2-Wire Switch Input
Connect standard Douglas
2-wire relay switches to
provide a master control.
Connect the switch and
connect blue return to the
transformer supplying
the switch.
Relay scanners have wide application in
low voltage lighting controls. Relay
scanners permit a large group of relays
to be switched together. Relay scanners
also permit each relay in the group to
be individually controlled.
WR-8812 and WR-8824 relay scanners
have 12 and 24 outputs that switch
Douglas relays.
Standard Douglas relay switches can
be used to actuate relay scanners.
Automatic devices such as time clocks
are also easily connected to relay
scanners.
Several scanners can be controlled by
one switch or timer contact. Simply wire
the inputs of the scanner's in parallel
and connect to same switch and/or
timer.
OFF
SWITCH , 7 / ) 5
4 - ) ;
5 9 16 + 0
9 4 &
H9 4 & #
BLUE
RETURN
Directions
Directions are
printed on the
front of the
scanner for
convenient
reference.
SPECIFICATION
Power:
24VAC / 50mA
Class 2 Low Voltage device.
Power rating does not include power
used to switch relays.
Master switch inputs:
Douglas 2-wire relay switches
(WR-8001, WR-8501, WR-8503).
Usage: Master switch override.
Auxiliary 24 VAC inputs:
Contact closure of a timer, photocell or
other device can signal the scanner.
The sw. and aux. inputs are isolated
from the rest of the scanner's circuit.
Outputs
WR-8812: 12 Douglas relay outputs.
WR-8824: 24 Douglas relay outputs.
All outputs send a switching signal
when the input is activated.
Outputs fire in sequence (

ON
OVERRIDE
OFF
OVERRIDE
Relay Scanners
WR-8812 & WR-8824
Technical Data
CONNECTIONS
Simple Stand Alone Panels
Relay scanners permit a large group of relays to be controlled with
a single master switch.
Relay scanners permit the individual relays of the relay group to
be individually switched. The switch installed in the area operates
the lighting load of that area only (usually 1 relay).
Automatic devices such as timers can be installed to automatically
switch lights OFF. Individual switches permit occupants to switch
lights back ON (If flick warn or time out feature is desired, use
WRS-2224 Programmable Relay Scanners).
Secondary School
Reflected Ceiling Plan
Classroom 101
a,b,c
Sw
Breaker
Panel
Relay
Panel
Classroom 102
Sw
a,b,c
Classroom 103
Sw
a,b,c
Classroom 104
Sw
a,b,c
Lights
H
Breaker
Relay Panel
Transformer
24VAC
Relays
W
B
1
2
3
4
5
6
7
8
9
10
11
12
W B
WR-8812
Relay
Scanner
Aux ON
Aux Com
Aux OFF
Douglas Sw
Blue Return
Individual
Occupant
Switches
Sw
a
Sw
b
Sw
c
Sw
a
Sw
b
Sw
c
Sw
a
Sw
b
Sw
c
Sw
a
Sw
b
Sw
c
Rm
101
Rm
102
Rm
103
Rm
104
Master
Switch
Max: 4 Relays
per output.
Sw
ON
OFF
School
Office
Sw
Master
Switch
Auxiliary Devices:
Timers, Photocells
or Building
Automation Systems
Interfaces 1.2
C-1-1,2,3,4 -Controls, Scanners
www.DouglasLightingControls.com

Relay Scanners
WR-8812 & WR-8824
Technical Data
CONNECTIONS
Multiple Relay Panels
In larger buildings, there are often several load centers that need
to be controlled from one location.
A simple wiring strategy is to inter-connect the relay panels with a
multi-conductor bus. This method permits several master switches
and/or time controls to exist at each relay panel. Provide enough
conductors to run between panels to accommodate the necessary
controls. Connect the scanners in the relay panel to the
appropriate control wire of the bus.
Projects that are inter-connected with a multi-conductor bus
should use a separate transformer to supply the power used by
the multi-conductor bus. Therefore, the power used in each relay
panel to switch the relays is separate from the power used for the
master switching circuit. The isolation of the panel power from the
signal power is the relay scanner. All Douglas scanners have
master switch inputs that are optically isolated from the rest of the
scanner.
Lights
Lights
Lights
Main Panel
Rly
Rly
Rly
Rly
Rly
WR-8812
or
WR-8824
Scanners
w
B
Sw
6
B
W
B
Tr
Rly
Rly
Rly
Rly
Rly
Rly
Lights
Lights
Lights
Remote Panel
Rly
Rly
Rly
WR-8824
Scanner
Tr
Rly
Rly
Rly
Individual
Occupant
Switches
Sw
Sw
Sw
Rly
Rly
Rly
Lights
Lights
Lights
Sw
Sw
Sw
Sw
Sw
Lights
Lights
Lights
Rly
Rly
Rly
Rly
Rly
Rly
Rly
WR-8824
Scanner
12345678 WB
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Lights
Lights
Lights
Sw
Sw
Lights
Lights
Lights
Remote Panel
Rly
Rly
Rly
Rly
Rly
WR-8824
Scanner
Tr
12345678 WB
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Lights
Lights
Lights
Lights
Lights
Lights
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
WR-8812
or
WR-8824
Scanners
w
B
Sw
1
B
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Rly
Lights
Rly
Rly
Lights
Rly
Rly
Lights
1 2345678
W
24 V B
Inter-connected Panels
A 10 conductor bus will provide complete
access to all 8 time clock outputs plus the
24V signal power and return.
w
W
Sw 1
Sw 2
Sw 3
Sw 4
Sw 5
Sw 6
Sw 7
Sw 8
Master
Switch
Station
WTP-4408
Time Clock
A B C D
1 2 3
1
4
2
5
3
6
Esc
Clr
47 58 69
7 0 8 9
0
5 A I H
5 A I H
9
!
"#$%&
9
*
12345678
Global
Transformer
W
B
Tr
Interfaces 1.3
C-1-1,2,3,4 -Controls, Scanners
www.DouglasLightingControls.com

Relay Scanners
WR-8812 & WR-8824
Technical Data
INSTALLATION
Installation of relay scanners is usually as follows:
1) After the relays of a panel have been assigned to lighting
loads, determine which relays are to be switched together.
2) Size the relay scanner accordingly (WR-8812 or WR-8824)
and install it in the panel.
3) Connect the relays to be controlled as a group to the scanner's
outputs.
4) The master switch is connected to the relay scanner.
5) Switches controlling an individual relay are connected in
parallel with the scanner output.
Larger Projects
In larger buildings there will be several relay panels. Often relay
groups in different panels will have similar function. For example:
- all of the classrooms in a school,
- all of the office rooms on a floor,
- all of the overhead flood lights in a store,
- all of the corridor lights in an institution, etc...
See the circuit described in "CONNECTIONS" for a simple
method to inter-connect all of the relay panels of a building so that
similar groups can be controlled together.
Changing Relay Groups
The WR-8812 and WR-8824 Relay Scanners switch all of the
relays connected to the scanners. To remove a relay from the
scanner's control, disconnect it from the scanner's output. To add
a relay to the group controlled by the scanner, connect it to an
output on the relay scanner.
Panels with Many Relay Groups
In many applications there are only 1 or 2 groups of relays present
in each relay panel. For these applications WR-8812 and WR-
8824 relay scanners are the most cost effective and simple.
Applications that have 2 or more relay groups present in a relay
panel may find advantage in using programmable relay scanners.
Connect all of the relays to the scanner and then use the key pad
built in to the scanner to select which relays are to be in each
group. Programmable scanners also support other features such
as flick-warn and digital control which may be necessary in more
complex applications.
MASTER SWITCH INPUTS
ON & OFF Switches and Relay Scanner Status
The Douglas switch input of the relay scanner is compatible with
all models of Douglas relay switches. Douglas timers that have
relay outputs (eg: WTC-4328) are also compatible.
The Douglas switch input of the relay scanner provides a status
signal to light the LED's of LED switches. LED's display what the
last sweep was of the relay scanner.
Take care when using WR-8501 LED Switches. The WR-8501
push button switch is will always send a signal that is opposite to
its current state. If repeat off or on control is desired, use the WR-
8001 rocker switch which is able to select an on or off signal.
ON Only Switching
ON ONLY switches generally are only used in parallel with a timer
that can provide an OFF signal. ON ONLY switches are typically
used to prevent unauthorized or accidental OFF switching.
Office Floor Example: Timer provides automatic OFF during the
evening and night hours. The wall switches only turn ON the
lights. During the day when the office is occupied, pressing the
switch has no effect -as the lights are already ON.
WR-8911
Contact Switch
OFF Only Switching
OVERRIDE BUTTONS
Relay Scanners
ON
6 D A = I J= ? JE BJD EI K EJ
EI E @ E? = JA @ > O JD A - , I
= @ A E 8 = ? K L A H+ = = @ =
ON Diode
WR-8812 or
WR-8824
OFF
= @ A E
8 = ? K L A H
+ = = @ =
) 7 : 1 1) 4 ;
+ 6 4
) F F O " 8 ) +
= E J= E A @ H
A J= HO
OFF ONLY or "Kill Switches" often find application in residences.
Larger rooms tend to have several circuits. Designating the switch
in a lower corner of the switch station as a "kill switch" can provide
a convenient exit switch.
ON
24VAC
RETURN
OFF
SWITCH , 7 / ) 5
4 - ) ;
5 9 16 + 0
9 4 &
H9 4 & #
BLUE
RETURN
B
W
WR-8911
Contact Switch
WR-8812 or
WR-8824
ON
Relay Scanners
OVERRIDE BUTTONS
6 D A = I J= ? JE BJD EI K EJ
EI E @ E? = JA @ > O JD A - , I
= @ A E 8 = ? K L A H+ = = @ =
OFF
= @ A E
8 = ? K L A H
+ = = @ =
) 7 : 1 1) 4 ;
+ 6 4
) F F O " 8 ) +
= E J= E A @ H
A J= HO
ON
24VAC
RETURN
OFF
SWITCH , 7 / ) 5
4 - ) ;
5 9 16 + 0
9 4 &
H9 4 & #
BLUE
RETURN
OFF Diode
B
W
Interfaces 1.4
C-1-1,2,3,4 -Controls, Scanners
www.DouglasLightingControls.com