2 Engineering
2.2 Electrical power network
DC1 variable frequency drive 12/13 MN04020003Z-EN www.eaton.com 29
Figure 12: EMC and VAR screw locations
The required filter winding for electromagnetic compatibility (EMC) no longer
exists in this case.
2.2.2 Mains voltage and frequency
DC1 variable frequency drives feature a wide tolerance range that incorpo-
rates the rated values for European (U
LN
= 230 V/400 V, 50 Hz) and American
(U
LN
= 240 V/480 V, 60 Hz) standard voltages:
• 115 V, 50/60 Hz at DC1-1D…
110 V - 10 % - 115 V + 10 % (99 V - 0 % - 126.5 V + 0 %)
• 230 V, 50 Hz; 240 V, 60 Hz bei DC1-12…, DC1-32…
200 V - 10 % - 240 V + 10 % (180 V - 0 % - 264 V + 0 %)
• 400 V, 50 Hz; 480 V, 60 Hz bei DC1-34…
380 V - 10 % - 480 V + 10 % (342 V - 0 % - 528 V + 0 %)
The permissible frequency range for all voltage categories is 50/60 Hz
(48Hz-0%-62Hz+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 phase conductors are loaded
unevenly and if large output loads are connected directly. In variable
frequency drives powered with a three-phase power supply, these unbal-
ances may cause the diodes in the mains rectifier to be loaded unevenly,
resulting in premature diode failure.
￫
Measures for electromagnetic compatibility are mandatory in a
magnet system, to meet the legal standards for EMC- and Low
Voltage Directive.
Good earthing measures are a prerequisite for the effective
insert of further measures such as screen earth kit or filters
here. Without respective grounding measures, further steps are
superfluous.
VAR
EMC
EMC
L3
U
L2/N
L1/L
VAR
PH1
M3
20 mm (0.79")
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