Lab.gruppen PLM 20K44 - Manual (Page 10)

9. Operating voltage
10
PLM+ SERIES Quick Start Guide rev 1.0.0
9.1. Low voltage country considerations
Although the 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
Amp
120V
120V
120V
L1
Amp
L2
L3
Amp
N N
Amp
Amp
Amp
3 phase Y 120V
3 phase delta 208V
208V
208V 208V
L1 L2
L3
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
Split phase 100V
100V 100V 200V
L1 Amp L2 N Amp
Split phase 200V
L1 L2
N
Amp