6-62 Applied Operation PLZ-4W
6.10 Parallel operation
The PLZ-4W Series Electronic Load allows parallel operation in which multiple
electronic loads can be connected in parallel to increase the current capacity or
power capacity. In parallel operation, one unit becomes a master unit in charge of all
controls in parallel operation. The master unit displays the total current and total
wattage of the units connected in parallel.
The following two methods of parallel operation are available.
Parallel operation using the same model
In this method, multiple units configured to be slaves are connected in parallel with
a unit configured to be the master. The slave units that can be connected in parallel
are of the same model as the master unit. Up to four slave units can be connected
(total of five units including the master unit).
Parallel operation using load boosters
In this method, load boosters (PLZ2004WB) are connected in parallel with a single
master PLZ1004W. Up to four load boosters can be connected in parallel.
• Load boosters (PLZ2004WB) can only be connected to PLZ1004W.
• During parallel operation, the specifications may not be satisfied on the individual
unit.
The accuracy of setting and measurement accuracy can be improved by carrying
out calibration in parallel operation.
• The current ripple during parallel operation is approximately equal to the number
of units connected in parallel times the current ripple of an individual unit.
• The resolution of setting during parallel operation varies depending on the num-
ber of units that are operating in parallel.
6.10.1 Parallel Operation Using the Same Model
To carry out parallel operation, signal wires for connecting between electonic loads
and the load wire for connecting to the equipment under test are required.
Use the optional flat cable for the signal wire. For details, see “Control flat cables”
in chapter 1, “General Information.”
Up to four slave units can be connected, but Fig. 6-49 shows an example in which
two units are connected.
NOTE
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