CHAPTER 3 - INSTALLATIONANDCONNECTION
Do not use the neutral from the main power supply to ground the inverter.
When electromagnetic interference (EMI), generated by the inverter,
problems with other equipment, use shielded wires or install the
metallic conduits. Connect one end of the shielding to the
point and the other end to the motor frame.
Always groundthe motor frame.Ground the motorinthe panel where
is installed or ground it to the inverter. The inverter output
separately from the input wiring, as well as from the
control and signal cables.
For IT networks (also known as ungrounded or high earthing impedance
networks) it is necessary to consider the following:
Models 180 A to 600 A/380-480 V, 2.9 A to 79 A/500-600 V, 107 A to 472 A/
500-690 V and 100 A to 428 A/660-690 V have a varistor and capacitor
connected between input phase and ground that must be disconnected if
IT network is used for that, remove the jumper as shown in figure 3.11.
In 500-600 V/500-690 V/660-690 V models, the jumper is accessible taking
out (models 2.9A to 14 A/500-600 V) or opening (models 22 A to 79 A/500-
600 V, 107 A to 211 A/500-690 V and 100 A to 179 A/660-690 V) the front
coveror takingoutthe connections cover(247Ato 472A/500-600 V and225A
In models 180 A to 600A/380-480 V, besides opening or
cover(s), it is required to remove the control board
The external RFI filters that are necessary in order to fulfill the requirements
of European EMC Directive as stated in item 3.3, cannot be used with IT
The user must check and assume the responsibility of personnel electrical
shock risk when using inverters in IT networks.
About the use of a differential relay at the inverter input:
- The indication of phase-to-ground short-circuit must be processed by
in order to indicate only a fault message or to turn off the
- Check withthe relaymanufacturer its proper operation with frequency
because of the existing high-frequencyleakage currents flowing
inverter, cable and motor parasitic capacitances to the earth.
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