Lenze i700 Manual User Manual download pdf (Page 100)

Electrical installation

Measures when drive is used in IT systems

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100

EDS700ACBA EN 4.0

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Only operate the controllers with the mains chokes assigned.

Operation with mains filters or RFI filters by Lenze is not permitted, as these

modules contain components that are interconnected against PE. By this the

protective design of the IT system would be cancelled out. The components are

destroyed in the case of an earth fault.

Protect the IT system against earth fault at the controller.

Due to physical conditions, an earth fault on the motor side at the controller

can interfere with or damage other devices on the same IT system. Therefore

appropriate measures have to be implemented, by means of which the earth

fault is detected and which disconnect the controller from the mains.

Permissible supply forms and electrical supply conditions

Mains Operation of the controllers Comments

With an isolated neutral

point (IT systems)

Permissible if an earth fault is detected

and eliminated by suitable mechanisms

as soon as possible.

l An earth fault on the motor side with

a switching frequency of 4 kHz or

8 kHz can cause a safety shutdown of

the device.

l An earth fault on the motor side at

16 kHz presents an impermissible

load for the controller.

Permissible supply forms and electrical supply conditions

Mains Operation of the controllers Notes

With isolated star point (IT

systems)

Possible, if the controller is protected in

the event of an earth fault in the

supplying mains.

l Possible, if appropriate earth fault

detections are available and

l the controller is immediately

disconnected from the mains.

Safe operation in the event of an earth

fault at the inverter output cannot be

guaranteed.

Installation of the CE−typical drive system

For the installation of drives on IT systems, the same conditions apply as for the installation

on systems with an earthed neutral point.

According to the binding EMC product standard EN61800−3, no limit values are defined for

IT systems for noise emission in the high−frequency range.

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Lenze i700 Manual User Manual Page 100

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