Podcast
Questions and Answers
What is the maximum time for the barrier to operate at 75% rated voltage?
What is the maximum time for the barrier to operate at 75% rated voltage?
Which motor operating current is correct for 110V AC?
Which motor operating current is correct for 110V AC?
Which of the following correctly describes the open position of the boom?
Which of the following correctly describes the open position of the boom?
Which feature provides protection against unauthorized access?
Which feature provides protection against unauthorized access?
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What type of insulation does the motor use?
What type of insulation does the motor use?
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What is the purpose of the snubbing device?
What is the purpose of the snubbing device?
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Which of the following is NOT part of the operating sequence for the barrier?
Which of the following is NOT part of the operating sequence for the barrier?
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Which testing requirement involves performing a high voltage test?
Which testing requirement involves performing a high voltage test?
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Study Notes
Barrier Types and Operation
- Two types of barriers exist: those without a hand generator (using 110V AC or 24V/110V DC) and those with a hand generator (using 24V/110V DC).
- The operating sequence involves opening the detection contacts, moving the boom, locking it, and closing the contacts.
- The barrier operates in two positions: open (85-90 degrees from horizontal) and closed (0-2 degrees from horizontal).
- Operation time is under 12 seconds at rated voltage, or a maximum of 20 seconds at 75% rated voltage.
Technical Specifications
Boom Construction
- Barriers use galvanized iron sheets in an octagonal shape.
- The boom can have 4 segments, each 2.44 meters long.
- Available total boom lengths are 4.88m, 7.32m, and 9.76m.
- The boom is painted with alternating 300mm black and yellow bands.
- A red disc (600mm diameter) with a STOP sign is featured.
- An LED boom light with a built-in fuse is located centrally.
Motor Specifications
- The motor uses class B insulation.
- Its short-time rating is 10 minutes.
- The motor rotates in both directions.
- It has overload protection using specific MCBs (miniature circuit breakers).
- Operating current varies based on type: AC (110V) with normal 2.5A and maximum 4A; DC (24V) with normal 4A and maximum 7A; DC (110V) with normal 1A and maximum 1.8A.
Safety Features
- The barrier features fail-safe locking in both vertical and horizontal positions.
- A fracture segment is included to prevent impacts.
- A gradual movement is achieved using a snubbing device.
- Emergency operation is provided.
- Unauthorized access is prevented.
- A positive boom locking system is present.
Control and Monitoring
- The control panel includes: power indication, open/close push buttons, an emergency operation button, boom position indicators, and lock status indicators.
- The hand generator version has additional features: a generator/push button selector switch; an optional integrated control panel.
Testing Requirements
Types of Tests
- Routine Tests: visual inspection, high voltage test, insulation resistance test, and performance test.
- Acceptance Tests: identical to routine tests, but with a sampling plan.
- Type Tests: environmental testing, 100,000 cycle life testing, and additional performance parameter testing.
Warranty and Documentation
- Warranty period: 24 months from supply or 12 months from commissioning.
- Documentation includes installation and maintenance manuals.
- A tool kit is provided.
- Optional spare parts are available.
Installation Requirements
- Required road clearance: 0.8 to 1 meter.
- Weather-proof barrier design.
- Lubrication points are included.
- Proper cable protection methods are implemented.
- Secure locking mechanisms are essential.
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Description
This quiz covers the various types of barriers used in operations, including their features and specifications. It details how barriers function, the components involved in their operation, and the technical specifications of the boom construction and motor. Test your understanding of these essential features and operational sequences.
