Rev C Doc 6001288 (01-20285) 37 of 39
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 cannot 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 Box: 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: The closure of this switch 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: The excursion of this object 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.
Power Fail Option: A battery backup system which opens or closes the gate at power outage.
Pulley: A grooved wheel which transfers power via a belt.
Reclose Timer: An electronic timer which closes the fully open gate automatically.
Retry: A condition at which the stopped gate resumes its course automatically after the occurrence of a
Fault.
RPM: Rotation Per Minute is a term to indicate the speed of a rotary 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 the causes rotation.
Torque Limiter: A clutch-like mechanism used to relieve excessive torque generated by the gate on the
gate operator.
