2 Engineering
2.2 Electrical power network
DB1 variable frequency drive
11/20 MN040031EN
Eaton.com
36
2.2.2 Mains voltage and frequency
The standardized rated operating voltages (IEC 60038, VDE 017-1) of power
utilities guarantee the following conditions at the connection point:
•
Deviation from the rated value of voltage: maximum ±10 %
•
Deviation in voltage phase balance: maximum ±3 %
•
Deviation from rated value of the frequency: maximum ±4 %
The wide tolerance range of the DB1 variable frequency drive takes into
account as the rated value both the European (EU: U
LN
= 230 V/400 V, 50 Hz)
and the American (USA: U
LN
= 240 V/480 V, 60 Hz) standard voltages:
•
115 V, 50 Hz (EU) and 115 V, 60 Hz (USA) at DC1-1D…,
110 V -10 % - 115 V +10 % (99 V -0 % - 126 V +0 %)
With the internal voltage doubling, the mains voltage
is increased from 115 V to 230 V output voltage (motor voltage).
•
115 V - 230 V, 50 Hz (EU) and 115 V - 230 V, 60 Hz (USA) at DC1-1M…,
110 V - 20 % - 230 V +10 % (88 V -0 % - 253 V +0 %)
•
230 V, 50 Hz (EU) and 240 V, 60 Hz (USA) at DB1-12…, DB1-32…
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 %).
2.2.3 Voltage balance
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 mains 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
supplied variable frequency drives (DB1-
3
…), consider only
AC supply systems that handle permitted asymmetric divergen-
ces 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 mains choke is
recommended.
￫
The mains chokes assigned to the DB1 variable frequency dri-
ves can be found in
