Rev E
Doc 01-20201
6 of 33
3. TRAP GATE DETAILS
The Trap gate is typically used in secured sites for screening incoming and/or outgoing traffic. In the
Trap configuration, only one gate opens at a time, “trapping” the vehicle between gates. Due to ease of
use, Slide Gates are the most popular for the Trap configuration. The Trap configuration can consist of
any LiftMaster model for the Master, and a model SL 1000-B3 (slide gate), or BG 3000-B3 (barrier gate)
for the Slave.
NOTE
: The SW 2000-B3 (swing gate) may not be used for the Slave gate.
Figure 4. Typical Trap Gate Installation.
HOW IT WORKS
•
In normal operation, one gate must completely close before the other opens, so only one gate is
open at a time. As soon as one gate closes, the second gate automatically opens. If the second
gate does not open within 10 seconds, the first gate reopens to let the vehicle exit the trap area.
•
ATG (Anti-Tailgate) is always active for both Master and Slave units. Each gate closes as soon as its
Inside Interrupt loop clears.
•
Faults and Manual Input Commands in one unit affect both units.
•
A continuous FIRE or Manual OPEN input in either unit opens the gates and holds them open.
•
If a vehicle stalls between the gates and they close, they can be opened by a CYCLE or RADIO
command, or by driving over the Slave unit Inside Interrupt Loop (gate to SLIDE or BARRIER only).
STREET
COMPLEX
Gate
Operator
Master
Gate
Operator
Slave
Inside Interrupt
Loop
Shadow Loop
(swing gate only)
Outside Interrupt
Loop
Inside Interrupt
Loop
Outside Interrupt
Loop
ADDITIONAL
INPUTS:
Radio
Cycle
Interrupt Bar
Photo-Sensors
Fire
MagLock
Manual Inputs
ADDTIONAL
INPUTS:
Radio
Cycle
Interrupt Bar
Photo-Sensors
Fire
MagLock
Manual Inputs
1384F4
Master/
Slave
Cable
