Automated Gate Systems Technician flashcards
Automated Gate Systems Technician · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- UL 325
- The safety standard for gate, door, and window operators; requires listed operators and two independent entrapment protection means for automatic or remote-controlled gates.
- ASTM F2200
- Standard for automated vehicular gate construction; addresses gate openings, pinch points, and entrapment hazards that the operator cannot mitigate alone.
- Operator class
- UL 325 classification I through IV based on traffic type and duty; residential is Class I, commercial Class II, heavy industrial Class III, guarded industrial Class IV.
- 4-inch sphere rule
- ASTM F2200 requirement that no opening in the gate or fence between 16 and 48 inches above grade may pass a 4-inch sphere.
- Two entrapment protection means
- UL 325 requirement that automatic operators have two independent entrapment protection devices, such as a photo-eye and a safety edge.
- NEC Article 430
- National Electrical Code article governing motor circuits, branch-circuit conductors, overload protection, and disconnects for gate operator installations.
- Gate clearance check
- Verify at least 1 inch of clearance between the moving gate and adjacent structures throughout travel to prevent pinch and crush points.
- Utility locate
- Call 811 or the local one-call service before digging footings to mark buried power, water, gas, and communications lines.
- Voltage drop formula
- VD = (2 × K × I × L) / CM, with K about 12.9 for copper, I in amps, L one-way feet, and CM circular mils; size conductors to limit drop.
- Dedicated branch circuit
- A circuit serving only the gate operator, with a lockable disconnect within sight, as required by the electrical code.
- Low-voltage separation
- Run control, sensor, and accessory wiring in conduit separate from line-voltage power to reduce electrical noise and code violations.
- Articulated arm operator
- Swing gate operator using an arm that folds as the gate opens; suited to residential and light commercial gates with adequate clearance.
- Rack-and-pinion operator
- Slide gate operator driving a gear against a rack mounted on the gate; preferred for heavy gates and long travel distances.
- Manual release
- A disconnect that allows the gate to be moved by hand during power loss; must operate with the gate under load.
- Limit switch
- A switch that signals full-open or full-closed position to the control board and stops the motor at the set travel point.
- Duty cycle
- The number of operating cycles per hour an operator is rated for; exceeding it causes overheating and premature motor or gearbox failure.
- Torque limiter
- A clutch or sensing device that limits operator force; set to manufacturer specification to reduce entrapment risk while moving the gate reliably.
- Through-beam photo-eye
- A non-contact entrapment sensor with a transmitter and receiver across the gate path; mounted 4 to 6 inches above grade, within 21 inches of the gate.
- Safety edge sensor
- A contact sensor mounted on the gate's leading edge that reverses or stops the gate when pressure is applied along its length.
- Presence loop
- An inductive loop that detects a vehicle in the gate area and holds the gate open until the vehicle clears.
- Shadow loop
- An inductive loop placed inside the gate path that prevents the gate from closing on a vehicle occupying the opening.
- Loop installation depth
- Inductive loops are saw-cut 2 to 3 inches deep, typically 3 to 4 turns, with twisted lead-in wire to the detector.
- Force adjustment
- Setting the operator's open and close force to the minimum that reliably moves the gate; excessive force increases entrapment injury risk.
- Commissioning cycle test
- Run the gate through at least 5 full open and close cycles while observing for faults, binding, and abnormal current draw.
- Limit switch setting
- Adjust full-open and full-closed limits so the gate stops before mechanical stops, preventing over-travel and damage.
- Monthly safety test
- Obstruct the photo-eye and apply pressure to the safety edge to confirm the gate reverses or stops; required for ongoing compliance.
- Current draw test
- Measure motor current under load and compare to nameplate; elevated current indicates binding, worn bearings, or low supply voltage.
- Battery backup test
- Disconnect line power and verify the operator opens and closes on battery per manufacturer specification, then restore power.
- No-open troubleshooting
- Check supply power, control voltage, limit switch state, safety input state, and receiver signal in that order to isolate the fault.
- Lockout/tagout
- De-energize and lock the disconnect before servicing line-voltage circuits; verify with a meter before beginning work.
- Handover documentation
- Provide the owner with the operator manual, UL 325 listing, sensor instructions, as-built photos, and a signed acknowledgment of training.
- Service log
- A record of dates, tests performed, parts replaced, and technician initials kept for warranty, compliance, and troubleshooting history.