KEPCO BHK-MG 200W (Full Rack) Series - Manual (Page 110)

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BHK-MG (OPR) 022014
The output voltage of the parallel combination in voltage mode is given by the equation,
Eo = Eo
M
where Eo
M
is the output voltage of the master unit, in Volts.
The load current is given by the equation,
Io = Eo / R
LOAD
.
The individual currents of the master and slave supplies are,
Io
M
= Io
S
= Io / 2.
RECOMMENDED PROCEDURE. The following steps are recommended to ensure the combi-
nation of power supplies (power assembly) configured for parallel master-slave operation is
connected and set up properly for voltage mode operation.
1. With the units turned off, perform all external wiring (see Figure 3-24). If possible, use a
properly rated switch between the power supply and the load. Identical models are recom-
mended for parallel operation.
2. Apply power to the units:
a. If a load switch is used, open the switch. Set POWER switch of both units to up position
to turn power on.
b. If load switch is not used, Set POWER switch of both units to up position to turn power
on, then press OUTPUT ON/OFF key once on each unit to disable the output.
3. Program slave unit as follows:
a. Program output current of slave unit (Iset
S
) to 0.
b. Program Vset
S
to the rated maximum voltage of the slave unit (e.g., for BHK1000-
0.2MG set Vset
S
= 1000).
c. Program overcurrent value of slave unit (Iocset
S
) to 1.1 x rated maximum current of
slave unit (e.g., for BHK 1000-0.2MG, program Iocset
S
= 220 (mA)).
d. Program overvoltage value of slave unit (Vovset
S
) to 1.1 x output voltage of power
assembly (Eo).
4. Program master unit as follows:
a. Program Iset
M
to 1/2 the desired current limit, I
LIM
of the power assembly.
b. Program Vset
M
to the output voltage of the power assembly, Eo.
c. Program overcurrent value of master unit (Iocset
M
) to 1.1 x Iset
M
(step 4a).
d. Program overvoltage value of master unit (Vovset
M
) to 1.1 x Vset
M
(step 4b).
5. To apply power to the load:
a. If load switch used, close the switch.