BHK-1/2-MG 030916
3-51
3.9.2
SERIES OPERATION
Kepco BHK-MG power supplies can be series-connected to increase output voltage if the pre-
cautions outlined below are followed. Two basic series-connection methods are generally used:
automatic (PAR. 3.9.2.1) and master-slave (PAR. 3.9.2.2).
HANDLING HIGH VOLTAGE, LOW IMPEDANCE EQUIPMENT IS DANGEROUS, AND
POTENTIALLY LETHAL. OBSERVE ALL PRECAUTIONS LISTED IN PAR. 3.8.1., AS WELL
AS THE PRECAUTIONS LISTED BELOW.
a. Do not exceed the specified isolation voltage limit (see Table 1-2). If the isolation volt-
age might be exceeded, limit the excursion of one power supply output: e.g., if two
BHK 2000-20MG models are to be series-connected, the output of one must be
restricted to 0.5 kV (limiting the series combination to a maximum of 2.5kV), because
the isolation voltage for this model is 2kV + 0.5kV (see Table 1-2).
b. Connect the chassis ground terminal, TB1-4, of all series-connected power supplies to
a good a-c ground (earth ground).
c. If necessary, the grounding network can be used for each one of the series-connected
power supplies within the limits of the maximum isolation voltage (see Table 1-2) of the
Model BHK-MG Series (refer to PAR. 2.7.5.3 for additional information regarding use of
the grounding network).
d. The series combination of BHK-MG power supplies can operate either isolated from
ground (floating) or with either of the two output terminals of the series combination
grounded. When analog programming is used, however, it is recommended that the
positive output terminal of the series combination be grounded to avoid potentially haz-
ardous conditions requiring the use of fully insulated external equipment (see precau-
tions of PAR. 3.8.1).
If the negative output terminal is grounded, special precautions are required when using
external programming sources: THE PROGRAMMING SOURCE MUST BE ISOLATED AND
INSULATED for the sum of the voltages of the series combination. The programming source
must be either battery powered or powered through an isolation transformer and have “fully
insulated controls and chassis” features (see also PAR. 3.8.1).
NOTE: The simplified schematic diagrams (Figures 3-20 through 3-22) illustrating the associ-
ated interconnections show the power supplies configured in either slow mode for units
operating in voltage mode or fast mode for units operating in current mode, however
other combinations are also possible. Due to the low current involved, the units are
shown using local sensing since the drop across the power leads is usually negligible
compared to the output voltage. However, when very precise control of output voltage
applied to the load is desired, remote sensing should be used. Contact Kepco Applica-
tions Engineering when special configurations are indicated.
WARNING
Summary of Contents for BHK-MG Series
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Page 18: ...xii BHK MG030916 FIGURE 1 1 BHK MG 40W SERIES PROGRAMMABLE POWER SUPPLY...
Page 26: ...1 8 BHK 1 2 MG OPR 030916 FIGURE 1 3 RA 24 RACK ADAPTER WITH TWO 1 2 RACK BHK MG 40W UNITS...
Page 35: ...BHK 1 2 MG SERIES 030916 2 3 FIGURE 2 2 BHK MG SERIES REAR PANEL CONTROLS AND CONNECTIONS...
Page 100: ...3 54 BHK 1 2 MG 030916 FIGURE 3 20 SERIES AUTOMATIC CONFIGURATION...
Page 113: ...BHK 1 2 MG 030916 3 67 FIGURE 3 25 PARALLEL MASTER SLAVE CURRENT MODE CONFIGURATION...
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