KEPCO BOP-GL 1KW, Руководство оператора

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2-12
BOP-1K-GL 111315
2.5 WIRING INSTRUCTIONS
Interconnections between an a-c power source and a power supply, and between the power
supply and its load are as critical as the interface between other types of electronic equipment.
If optimum performance is expected, certain rules for the interconnection of source, power sup-
ply and load must be observed by the user. These rules are described in detail in the following
paragraphs.
CAUTION: When working with active loads, the voltage or current of the active load
must not exceed the maximum voltage or current rating of the BOP. Other-
wise the overvoltage or overcurrent protection will shut down the power sup-
ply.
2.5.1 SAFETY GROUNDING
Local, national and international safety rules dictate the grounding of the metal cover and case
of any instrument connected to the a-c power source, when such grounding is an intrinsic part of
the safety aspect of the instrument. The ground terminal of the source power connector (Figure
2-1) is connected to the chassis and the instructions below suggest wiring methods which com-
ply with these safety requirements; however, in the event that the specific installation for the
power system is different from the recommended wiring, it is the customer's responsibility to
ensure that all applicable electric codes for safety grounding requirements are met. As a pre-
caution, always connect the stud marked
at the rear panel to proper earth ground.
2.5.2 SOURCE POWER CONNECTIONS
Source power is connected to the power supply via three-wire input power using the source
power mating connector supplied (see Table 1-3). See Table 1-2 for source power specifica-
tions. This power supply operates from single phase a-c mains power (or between two phases
of 3-phase a-c mains power) over the specified voltage and frequency ranges (Table 1-2) with-
out any need for range selection. The user must provide aproperly sized and rated mains lead
(line cord) and service with a current rating compatible with the anticipated input current. Line
cords available as accessories are listed in Table 1-4. Kepco recommends #12 AWG (2,0 mm
diameter)
for input line cord.
2.5.3 D-C OUTPUT GROUNDING
Connections between the power supply and the load and sensing connections may, despite all
precautions such as shielding, twisting of wire pairs, etc., be influenced by radiated noise, or
“noise pick-up”. To minimize the effects of this radiated noise the user should consider ground-
ing one side of the power supply/load circuit. The success of d-c grounding requires careful
analysis of each specific application, however, this recommendation can only serve as a general
guideline.
One of the most important considerations in establishing a successful grounding scheme is to
avoid GROUND LOOPS. Ground loops are created when two or more points are grounded at
different physical locations along the output circuit. Due to the interconnection impedance
between the separated grounding points, a difference voltage and resultant current flow is
superimposed on the load. The effect of this ground loop can be anything from an undesirable
increase in output noise to disruption of power supply and/or load operation. The only way to
avoid ground loops is to ensure that the entire output/load circuit is fully isolated from ground,
and only then establish a single point along the output/load circuit as the single-wire ground
point.