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9. Operating voltage
9.1. Low voltage country considerations
Although the K&F PLM+ Series has a wide range of operating mains voltage, some considerations can be
applicable for low voltage regions. PLM+ performs well throughout the specified nominal voltage range but has
slightly better efficiency at higher voltages. For regions with nominal voltage below 140 V, one could consider
connecting the amplifier in a three-phase delta or two phase split-phase configuration.
Note: Following connections applicable only for resulting voltage inside the amplifiers nominal
voltage range.
Connecting the amplifier in three phase delta configuration
In three-phase configuration where the phases are 120 degrees apart, one can connect three balanced loads in a
delta configuration. The connection is made between the phases instead of between the neutral and a phase.
Three phase delta configuration
L1
N
L3
3 phase Y 120V
Connecting the amplifier in a split phase configuration
In two phase split-phase configuration there are two phases separated by 180 degrees. Connecting between the
phases gives double the line voltage.
Two phase split-phase configuration
100V
100V
L1
N
Amp
Amp
Split phase 100V
16
K
F PLM+ SERIES Quick Start Guide rev 2.0.0
&
L1
L2
3 phase delta 208V
L2
L1
Split phase 200V
L2
Amp
N
L3
200V
L2
Amp
N
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