User's Manual

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HID Corporation, 9292 Jeronimo Road, Irvine, CA 92618-1905, USA •Tel: [phone], Fax: [phone]
http://www.hidcorp.com MaxiProx Reader Installation Manual 5375-900 REV 06
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9
Chapter 3 Installation Notes and Guidelines
3.1
3.1 3.1
3.1 Power Supply
Power SupplyPower Supply
Power Supply
The recommended power supply is 12 or 24VDC, nominal, 2.0A current rating, linear regulated. The
MaxiProx cycles through varying power stages and has a peak current demand of approximately 1.2A when
in long range read mode. Average current consumption is about 260mA.
Failure to provide an adequate
current capacity power supply will result in reduced read range.
CAUTION!
The shunt jumper P2 is not installed as the factory default for +24VDC operation. If the jumper is in the +12
VDC position and +21 to +28.5 VDC is applied, circuit damage can result.
The use of a Power Switching Supply is not recommended for two reasons:
(1) This type of supply does not provide adequate response to rapid transient current loads and also
generates radio frequency (RF) interference in the same band that the Reader receives data and;
(2) The power supply may generate noise that is large enough to be transmitted or conducted to the
MaxiProx that interferes with the reception of a card signal. Some switching power supplies are not able
to provide adequate regulation to the MaxiProx Reader.
3.2
3.2 3.2
3.2 Installation near Metal
Installation near MetalInstallation near Metal
Installation near Metal
Read range will be reduced if located on metal surfaces or in the vicinity of metal objects. The amount of
reduction will be a factor of the amount of metal and the distance the Reader is from the metal. Metal near
the Reader absorbs energy from the Reader excite field and affects the signal being received from the card by
re-directing excite field transmissions into the receiver circuitry. Moving the Reader away from the metal
objects reduces energy loss.
Try to limit the amount of metallic materials installed near the MaxiProx. Use a plastic electrical box if
possible. Avoid installing conduit and other metal hardware within 2-inches of the back of the Reader or
closer than 4-inches from large metal surfaces. The typical read distance specification (24-29 inches at 21-
28.5 VDC or 21-26 inches at 12 VDC) refers to operation without metal in the vicinity of the Reader. The
read distance will be reduced if metal is installed nearby.
The MaxiProx generates a magnetic field on all sides of the Reader. Any metal that conducts electricity,
especially metal that contains iron, steel or copper will interfere with the field and reduce the effective read
range (this will happen even if the metal is behind the Reader). It helps to put a non-metallic spacer between
the Reader and the metal object.
3.3
3.3 3.3
3.3 Radio Frequency Interference
Radio Frequency InterferenceRadio Frequency Interference
Radio Frequency Interference
Motors and electronic devices generate RF noise that may interfere with the reception of the signal from a
transponder. The affect of RF noise is typically a reduction of read range. The MaxiProx is susceptible to RF
interference, as are all devices that receive RF signals. The read range is affected by the amount of
interference (noise) in the area. Common sources of RF interference are power supplies, electrical and
electronic equipment, some types of lighting, computers and monitors, motors and generators. Moving the
Reader to a location known to be free of interference and testing read range there will help to isolate RF
interference as a factor in low read range situations.