LiftMaster HCT HCT501130 Manual - Page 23

Wiring External Loop Detectors

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WIRING EXTERNAL LOOP DETECTORS ®OmniControl Surge Suppressor P/N Q410 Patent Pending 123456 7 8 9 10 11 12 13 G BA M/S Link Center Loop Safety Loop - Exit Fire Dept Strike Open Loop Key Switch Push Button + Radio Receiver Class 2 Supply 24 Volts DC 3 4 Common Normally Open External 115 Vac "Safety" Loop Detector - Allows system to stay open when vehicles are obstructing path. Caution: To PREVENT damage to vehicles shorter than 14 feet, a center loop system should be installed. If the "Inside" and "Outside" safety loops are connected to the same loop detector: • They should be series connected to the detector • Have the same dimensions. • Have the same number of wire turns. Common 6 Normally Open 5 External 115 Vac "Exit" Loop Detector - Allows operator to automatically open for exiting vehicles. OUT SaLfeotoyp SaLfoeotyp ELxoitop IN OUT SaLfeotoyp SaLfoeotyp Note: External 115 Vac Loop Detectors ELxoitop IN 21

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21
Strike Open
Push Button
Strike Open
Push Button
24 Volts DC
24 Volts DC
Fire Dept
Key Switch
Fire Dept
Key Switch
M/S Link
M/S Link
Class 2
Supply
Class 2
Supply
Center
Loop
Center
Loop
Safety
Loop
Safety
Loop
Radio
Receiver
Radio
Receiver
Exit
Loop
Exit
Loop
G
B
A
–
+
OmniControl S
u
rge S
u
ppressor
P/N Q410
Patent Pending
P/N Q410
Patent Pending
®
7
13
12
11
10
9
8
1
6
5
4
3
2
WIRING EXTERNAL LOOP DETECTORS
External 115 Vac
“
Exit
”
Loop
Detector -
Allows operator to automatically open for
exiting vehicles.
6
5
3
4
External
115 Vac
“
Safety
”
Loo
p Detector -
Allows system to stay open when vehicles are
obstructing path.
Caution:
To PREVENT damage to vehicles
shorter than 14 feet, a center loop system should
be installed.
Note:
External 115 Vac Loop Detectors
OUT
Safety
Loop
Exit
Loop
IN
Safety
Loop
OUT
Safety
Loop
Exit
Loop
IN
Safety
Loop
Normally Open
Common
Normally Open
Common
If
the
“Inside”
and
“Outside”
safety loops are connected
to the
same
loop detector:
•
They should be series connected to the detector
•
Have the same dimensions.
•
Have the same number of wire turns.