C
HAPTER
4 - M
AINTENANCE
BDS
4-2
CAUTION
If the short circuit inrush
current generated by the
power source is in excess of
5000 amps RMS symmetrical
current, an isolation
transformer or line inductor
must be utilized in the
incoming power circuit.
Failure to observe this
precaution could result in
damage to, or destruction of
the PSR4/5 and BDS4.
Input transformers step up or step down input voltage
and can be either autotransformers or isolation
transformers. Isolation transformers help eliminate
the following:
•
Damaging AC line voltage transients reaching
the PSR4/5 and BDS4.
•
Damaging currents which may develop if a
point inside the PSR4/5 or BDS4 becomes
grounded.
4.2.3 Electrical Noise
The low levels of energy in the BDS4 control circuits
may cause them to be vulnerable to electrical noise.
Sources of electrical noise are those pieces of
equipment that have large, fast changing voltages and
currents when they switch on and off. These devices
have the capability of inducing critical current and
voltage transients on their respective power lines.
These transients must be accommodated for with
noise immunity provisions.
Electrical noise is prevented with the same methods
as Surge Current and Transient Voltages. However,
there are other methods of preventing electrical noise.
Such as:
•
Maintain physical separation between electrical
noise sources and the BDS4 amplifier.
•
Maintain physical separation between electrical
noise sources and the BDS4 control wiring.
This can be accomplished by using separate
conduits or wiring trays for control wiring and
power wiring.
•
Use twisted-pair wiring for control circuits of
the BDS4.
•
Follow good grounding practices when wiring
the PSR4/5 and BDS4. Be careful not to create
a grounding loop with multiple ground paths.
Follow the NEC's provisions on grounding.
4.2.4 Radio Frequency Energy
NOTE
This equipment generates
radio frequency energy.
This equipment uses, and can radiate radio frequency
energy and must be installed and used in accordance
with this installation and service manual in order to
prevent possible interference with radio
communications or other electronic equipment.
4.3 PERIODIC MAINTENANCE
Periodic maintenance must be performed by qualified
personnel familiar with the construction, operation,
and hazards involved with the BDS4 and its
application. Power should be disconnected during all
maintenance procedures.
4.3.1 Ventilation
The PSR4/5 and BDS4 should be mounted vertically
to allow maximum ventilation of the components.
This configuration allows the heat generated by the
components to vent through the top and draft in
cooler air through the bottom. The top and bottom of
the components are vented to allow this drafting to
occur. These ventilation passages should be kept
open. If the PSR4/5 requires auxiliary cooling with
fans, inspect the fans on a regular basis.
4.3.2 Grounding Integrity
The method employed for grounding or insulating the
equipment from ground should be checked to assure
its integrity on a regular basis. This check should be
performed with the power off and the testing
equipment grounded.
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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