Kikusui PAN 110-1.5A, Operation Manual

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4-26 PAN-A
4.4 Master-slave-control parallel operation
It is possible to increase the current capacity by connecting a maxi-
mum two slave units in parallel to one master unit. In a master-slave-
control parallel operation system, the output preset for all the units
connected in parallel can be provided only on the master unit.
To perform such master-slave-control parallel operation, an electro-
lytic capacitor should be connected to the load terminals.
• Never attempt to connect wires to the control termi-
nals while the POWER switch turned on. This may
result in electric shock or damage to the internal cir-
cuitry.
• Parallel connection is possible only for the PAN-A or
PAN series power supplies that have the same rated
output voltage and rated output current. Connecting
power supplies of different rated outputs in parallel
may cause malfunction.
• Perform parallel operation only when using the mas-
ter-slave-control parallel operation system. Parallel
connection of output alone may cause unit failure.
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Presetting of OVP trip points in parallel operation
When carrying out parallel operation, OVP (overvoltage protection)
trip points should be preset for both the master unit and for all slave
units. For example, if the master unit becomes unable to control the
slave units - because, for example, its POWER switch is inadvertently
turned off during parallel operation - the slave units may output their
maximum output voltage. If an appropriate OVP trip point has been
preset for these units, however, the load can still be protected.
In parallel operation, the OVP trip points for slave units should be set
to slightly higher values than that used for the master unit. However,
do not preset them to a value exceeding 105 % of the rated voltage.
If the OVP trip points for the slave units are preset to a value below
that of the master unit, their overvoltage protection will function
fi rst,
turning off output from the slaves but not from the master unit.
WARNING
CAUTION