Lenel DirecDoor, Installation Manual

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DirecDoor Installation Guide
17
Observing Noise Prevention Procedures
Observing Noise Prevention Procedures
Signal Transmission
•
Where practical, keep cables well separated from each other. Separate power cables from signal
cables.
•
Keep the break-out at the ends of signal cables as short as possible.
•
Ground all shield drain wire(s) at the DirecDoor controller using the grounding nuts provided
outside the cabinet enclosure.
• WARNING! • Do not ground both cable ends.
Cable Routing
Keep cabling at least 1 foot (30.5 cm) away from any power line or other AC voltage source.
Exercise caution when locating cables and DirecDoor components near any other equipment that may
cause electrical interference (noise). Examples of electrical and electro-magnetic noise sources are:
•
Fluorescent lighting and neon fixtures.
•
Power distribution panels, including wiring, transformers, generators, and alternators.
•
Motors that drive machinery, such as air conditioners, elevators, escalators, large blowers, and
machine tools. Electromagnetic equipment such as degaussers, magnetic chucks, etc.
•
Control equipment (relays) for machinery and other switching devices that carry or switch large
currents.
•
Radio and television receivers and transmitters.
•
Signal generators and intercom systems.
•
Radar transmitting equipment.
•
Arc welders, electrodischarge machinery, and related equipment.
•
RF induction heaters.
Cable Length
•
Minimize long parallel cable runs since they increase the likelihood of interference between
signal cables and electrical interference sources.
•
Avoid excess cable length between the DirecDoor controller and the optional equipment, such as
readers and digital outputs, to reduce signal degradation due to external effects.
Mounting
Be sure to read the mounting and handling guidelines below before beginning to mount the controller.
Mounting and Handling Guidelines
Comply with the following guidelines:
•
Locate the host computer and the DirecDoor controller in areas secure from any disruption to
data communications or tampering.