Mains Voltage And Frequency; Voltage Balance - Eaton PowerXL DB1 Installation Manual

2 Engineering
2.2 Electrical power network

2.2.2 Mains voltage and frequency

2.2.3 Voltage balance

28
The standardized nominal voltages (IEC 60038, VDE 017-1) of power utility
companies guarantee the following conditions at the connection point:
• Deviation from the rated value of voltage: maximum ±10 %
• Deviation in voltage balance: maximum ±3 %
• Deviation from rated value of the frequency: maximum ±4 %
The broad tolerance range of the DB1 variable frequency drive observes
both the European (EU: U
(USA: U = 240 V/480 V, 60 Hz) standard voltages in this case:
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• 230 V, 50 Hz (EU) and 240 V, 60 Hz (USA) at DB1-12...
200 V -10 % - 240 V +10 % (180 V -0 % - 264 V +0 %)
• 400 V, 50 Hz (EU) and 480 V, 60 Hz (USA) at DB1-34...
380 V -10 % - 480 V +10 % (342 V -0 % - 528 V +0 %)
The permissible frequency range for all voltage categories is 50/60 Hz
(48 Hz -0 % - 62 Hz +0 %).
Unbalanced voltages and deviations from the ideal voltage shape may occur
in three-phase AC supply systems if the conductors are loaded unevenly and
if large output loads are connected directly. These supply voltage unbalances
may cause the diodes in the variable frequency drive's rectifier bridge con-
verter to be loaded unevenly, resulting in premature diode failure.
￫
In the project planning for the connection of three-phase sup-
plied variable frequency drives (DB1-3,etc.), consider only AC
supply systems that handle permitted asymmetric divergences
in the mains voltage ≦ +3 %.
If this condition is not fulfilled, or symmetry at the connection
location is not known, the use of an assigned main choke is
recommended.
￫
For the rated mains contactors for DB1 variable frequency
drives, please refer to ￫ section 2.5, "Mains chokes", page 32.
DB1 Variable Frequency Drives 09/17 MN040031EN www.eaton.com
= 230 V/400 V, 50 Hz) and the American
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