NORD Drivesystems BU0180 - Manual (Page 11)

1 General
BU 0180 GB-0914 Pre-series version 11
1.4 Safety and installation information
The frequency inverters are equipment for use in industrial high voltage systems and are operated at
voltages that could lead to severe injuries or death if they are touched.

Installation and other work may only be carried out by qualified electricians and with the
device disconnected. The operating instructions must always be available to these
persons and must be strictly observed.

Local regulations for the installation of electrical equipment and accident prevention
must be complied with.

The equipment continues to carry hazardous voltages for up to 5 minutes after being
switched off at the mains.

For single phase operation (115/230 V) the mains impedance must be at least 100

H
for each conductor. If this is not the case, a mains choke must be installed.

For safe isolation from the mains, all poles of the supply cable to the frequency inverter
must be able to be disconnected.

Even during motor standstill (e.g. caused by an electronic block, blocked drive or output
terminal short circuit), the line connection terminals, motor terminals and braking resistor
terminals may still conduct hazardous voltages. A motor standstill is not identical to
electrical isolation from the mains.

Warning, with certain settings, the frequency inverter/motor can start up automatically
after the mains are switched on.

The frequency inverter is primarily intended for permanent connection and may not be
operated without effective earthing connections that comply with local regulations for
large leakage currents (> 3.5 mA). VDE 0160 stipulates the installation of a second
earthing conductor or an earthing conductor cross-section of at least 10 mm
2
.
However, connection via a plug connector is also permissible if local regulations are
complied with.

A universal leakage current-sensitive circuit breaker (type B) compliant
with EN 50178/VDE 0160 must be used.

In normal use, frequency inverters are maintenance-free. The cooling surfaces must be
regularly cleaned with compressed air if the ambient air is dusty.

The frequency inverters are suitable for operation on TN or TT networks and with
observation of the measures described in Section 2.7.4, they are also suitable for IT
networks.