Chamberlain SL 1000-X3 - Manual (Page 40)

Rev J Doc 01-20098 Page 40 of 44
GLOSSARY
AC: Alternating Current. An electric current or voltage that reverses direction at regular intervals.
Alternate Action: Ability to open and close a fully open gate by using the same open command.
Arc: The area that is swept by a swing gate from fully closed to fully open position.
ATG: Anti-tailgating refers to a method of immediately closing an opening gate behind a vehicle so
that an unauthorized vehicle can not follow the authorized vehicle through the gate.
DC: Direct Current. An electric current of constant value flowing in one direction only.
Dynamic braking: Stopping the gate by activating the forward and reverse windings of the gate
operator motor in each half AC cycle.
Fault: An abnormal condition which causes the gate to stop to protect the gate and the user.
Gate sensitivity: The response of the gate operator to an exerting force to the gate.
Gear reducer: A device that changes the speed and power of its driving force (motor).
Inrush current: Initial current drawn into an electrical device due to its capacitive or inductive
nature.
Interrupt Bar or Edge: A switch which is installed at the edge of a gate to protect an object which
is situated between the gate and the gate frame.
LED: Light Emitting Diode. LEDs are indicators placed on the controller board which light up to
indicate an action in the system.
Limit switch: A switch which its closure indicates the gate has reached its open or close limit,
causing the gate to stop. There are two limit switches, open and close.
Limit cam: An object which its excursion corresponds to the gate traveling distance and closes the
limit switch at the open or close limit of the gate.
Loop sensor: A wire embedded in the ground for magnetically sensing large metallic objects
(cars).
# Exit or Open Loop: activation opens the gate.
# Interrupt or Reverse or Reopen Loop: activation reverses or stops the gate.
# Shadow Loop: activation prevents a fully open or closed gate from moving while a
vehicle is inside the arc of a swing gate.
Loop detector: An electronic device that is activated by a loop sensor sensing a metallic object.
Master/Slave: A synchronized system containing a pair of gate operators.
Maglock: An electric magnet which is used to secure the closed gate.
Pulley: A grooved wheel which transfers power via a belt.
Reclose Timer: An electronic timer which closes the fully open gate automatically.
RPM: Revolutions Per Minute indicates the rotational speed of an object.
Sprocket: A toothed wheel which transfers power via a chain.
Thermal overload: A condition at which a heat producing device shuts off automatically when it
reaches a critical and damaging temperature level.
Torque: A force that causes rotation.