4 FM quick reads on access control
1. Technology Drives Improvements in Access Control
Maintenance and engineering managers are finding the benefits of facilitywide access control systems go far beyond simply improving the level of security within buildings. In many cases, a well-designed and implemented system has resulted in reduced operating and maintenance costs, in part due to hardware standardization and the elimination of traditional key-based systems.
But access-control systems are not maintenance-free. As with all building systems — particularly those that combine advanced hardware and software — access-control systems require comprehensive maintenance, testing, and inspection if they are to perform as intended. If technicians do not perform those maintenance and testing activities regularly, the integrity of the access system will deteriorate, jeopardizing security for the facility and increasing maintenance costs.
Consider the facility's exterior doors. Access-control systems might be designed to limit access through particular doors, but if a door and its hardware do not operate properly and allow the door to fully close, an unwanted visitor can easily defeat the access-control system. To ensure the facility's doors do not hamper security, managers can implement a comprehensive program for inspecting, testing, and maintaining exterior doors, as well as secure interior doors.
One common problem area, particularly for heavier exterior doors, is the door hinge. Stresses on the hinges from frequent use and wear can cause the door to sag. If the sagging becomes pronounced enough, the door will bind or fail to fully close, compromising security. Managers can reduce the extent of door sagging by scheduling frequent inspections of the operation, adjustment and lubrication of door hinges.
To enable doors requiring an unusually high level maintenance to close properly, managers also can consider the use of continuous, geared hinges. This type of hinge essentially eliminates sagging issues by spreading stresses experienced by standard door hinges over the full height of the door.
Managers can greatly reduce the likelihood of deteriorated system performance by focusing attention on some of the most common trouble spots found in access-control systems.
Access-control systems are not independent, standalone systems. While they might operate independently from other building automation systems, they piggyback on top of existing building components. The most important of these components are the facility's doors and door hardware. No matter how well designed the access-control system is, it is only as secure as the components it operates.
2. Keep An Eye On Heat To Avoid Security Trouble
Overheated components too often are a factor in the premature failure of security equipment. In some cases, the mean time between failure decreases exponentially as the heat increases beyond the operating range of the equipment.
It is important for managers to ensure that equipment enclosures provide effective thermal management for the longevity of security equipment. The enclosure must be able to dissipate heat or prevent heat buildup beyond the equipment's maximum operating temperature. In very cold climates, managers might need to provide additional heat to keep the equipment from operating below the equipment's minimum operating temperature.
But since electronic equipment tends to reject heat inside an enclosure, overheating tends to be the greater problem. Too often, equipment is installed in an exterior enclosure with no thought to the heat load the equipment will generate inside the enclosure. The size or surface area of the enclosure plays a role in the amount of heat it can dissipate without using vents, fans, heat exchangers, or air conditioning.
The enclosure's location also might be a factor. If the enclosure is located in direct sunlight, it will have a significant increase in internal air temperature, and calculations to determine heat buildup become increasingly complex. The enclosure's color also takes on greater significance. For example, white enclosures will reflect much of the radiant heat from the sun.
Video cameras can feature a sunshield that stands off from the camera housing 1 inch or so and acts to absorb and dissipate heat before it reaches the housing.
Cooling systems can be classified as open or closed loop and active or passive systems. Open-loop systems use outside air to cool the components. They are often passive, using convection and heat dissipation. Closed-loop systems use internal air to cool the components. They are often active, using an external device or system to cool internal air.
Some systems on the market include louvers, grills, exhaust fans, heat exchangers, and air-conditioning systems. Some manufacturers provide special software that helps in selecting an appropriate cooling system for the enclosure.
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