Installation and Connection
3-13
3
Figure 3.11
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The CFW-11 inverter series, except the models with internal RFI filters – CFW11XXXXXXOFA, can be normally
used in IT networks. If the available model is equipped with an internal filter, remove the two grounding screws
from the filter capacitors as presented in figure 3.11. Remove the keypad and the front cover to have access to
these screws in frames A, B, and C. For frame D, the bottom front cover shall be removed as well.
Consider the following items for the use of protection devices on the supply side of the inverter such as residual
current devices or isolation monitors:
- The detection of a phase-to-ground short-circuit or an insulation fault shall be processed by the user, i.e., the
user shall decide whether to indicate the fault and/or block the inverter operation.
- Contact the RCD manufacturer for selecting the most appropriate device to be used with inverters in order to
avoid nuisance tripping due to the high frequency leakage currents that flow through the leakage capacitances
of the inverter, cable, and motor system to the ground.
