Load Edge Series
98 Parallel Operations
chapter 9 Parallel operation
9.1 Parallel operation
This series can be operated in parallel to increase the handling current and power. One unit act
as master and controls other units being connected in parallel.
The master unit also displays total current and power.
The units that can be connected in parallel are of same voltage rating.(ELL/ELA/ELB/ELC)
Model ELA-305 and ELA-1005 can be paralleled but ELA-305 and ELL-355 are not since
voltage ratings are different.
One master unit can control up to 4 slave units hence total 5 units can be used in parallel
operation.
*Some restriction may apply to the parallel operation.
・ Setting resolution may vary to the number of unit.
・ Setting accuracy in parallel operation is +/-3% of FS at Current H range and
+/-7% of FS at current L range.
・ The current ripple is defined as approximately “Ripple voltage” x “Number of
unit”.
・ Power distribution in parallel operation is relevant to the current rating ratio at
the specified current range.
Ex.) When ELA-305 and ELA-1005 are paralleled in CP mode:
When set ELA-305 as master then ELA-1005 can handle 900W max.
When set ELA-1005 as master then ELA-305 can handle 333W max.
As shown above (2), ELA-305 will be over powered depends on the
setting then Over Heat Alarm may be generated. Set ELA-305 as
Master when paralleled with ELA-1005 in CP mode.
・ The slew rate shown on the display is for the Master unit but total slew rate will
be slower than slowest model in paralleled.
9.1.1 Connection for Parallel operation
It is necessary to connect both signal cables between electronic load and load cables between
Electronic loads DUT.
As for signal cable, use attached connection cable.
As many as 4 sets of slaves can be connected but it shows 2 sets in Fig. 9-1-1
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