Installation
4-4
48XX/49XXSHB0399
4.2.4 Earthing of the control electronics
Single drives
( With factory setting, the reference potential GND of the control electronics is
joined to PE. Additional earthing measures are not required.
Group drives
( Ensure that earthing the control electronics does not cause any damage to
external controllers.
( Ensure to avoid ground loops when the ground is connected (GND):
- Remove the bridge to X4 from terminal 90 to terminal FE.
- All ground cables must be connected to externally isolated buses which
are as close to the controllers as possible.
- Make a low-resistance connection between the buses (at least 10 mm
2
)
and PE of the supply.
4.2.5 Mains types and conditions
Please observe the restrictions for each mains type!
Mains Operation of the controller Notes
With grounded neutral No restrictions Observe controller ratings
With grounded phase Operation is impossible.
With isolated neutral (IT mains) Operation with the recommended RFI filter
is only possible if an isolating transformer
is preconnected. The neutral of the
secondary circuit must be earthed
secondarily.
Contact Lenze. The RFI filter will be
destroyed when directly connected
to the IT mains and fault “earth
fault”.
Interaction with compensation equipment
For reactive-power compensation of mains with an inverter controller load, the
compensation unit should be equipped with a choke, since the controller
generates harmonic currents. These harmonic currents could excite oscillating
circuits which consist of mains impedance and capacitor reactance. Capacitors,
transformers, switching units, etc. could be destroyed by these reactance effects.
In this case, please contact the supplier of your compensation equipment.
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