Lab.gruppen D Series - Low Voltage Considerations; Grounding

6. Installation
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D SERIES Lake Operation Manual rev 3.0.4
6. Installation
D SERIES Lake Operation Manual rev 3.0.3
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6.4.1. Low voltage country considerations
Although the D Series has a wide range of operating mains voltage, some considerations can be applicable for
low voltage regions. D Series performs well throughout the specied nominal voltage range but has slightly better
efciency at higher voltages. For regions with nominal voltage below 140 V, one could consider connecting the
amplier in a three phase delta or two phase split-phase conguration, especially applicable for the bigger models,
(D200, D120 and D80).
NOTE: Following connections applicable only for resulting voltage inside the ampliers nominal voltage
range.
Connecting the amplier in three phase delta conguration
In three–phase conguration where the phases are 120 degrees apart, one can connect three balanced loads in a
delta conguration. The connection is made between the phases instead of between the neutral and a phase.
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
Figure 6:4: Three phase delta conguration
Connecting the amplier in a split phase conguration
In two phase split–phase conguration there are two phases separated by 180 degrees. Connecting between the
phases gives double the line voltage.
Figure 6.5: Two phase split–phase conguration
6.5. Grounding
D Series must be grounded (earthed) with the safety ground pin to the mains distribution system. NEVER
disconnect the earth (ground) pin on the mains cable (AC power cord). Use correctly-shielded balanced audio
input connections to minimize hum and interference.
Split phase 100V
100V 100V 200V
L1
Amp
L2N
Amp
Split phase 200V
L1 L2
N
Amp