KEB COMBIVERT M4 Instruction Manual page 44

Safety and Application Instructions
Protect
Against
Accidental
Contact
Note Capacitor
Discharge
Time
Control
Lines
Voltage with
respect to
ground
Only Fixed
Connection
Voltage Peaks
Insulation
Measurement
Different Earth-
Potentials
GB - 6
Inverters/servo drives must be protected against physical damage during tranport,
installation and use. Components and covers must not be bent or moved as this
may affect insulation distances. The equipment must not be switched on if it is
damaged as it may no longer comply with mandatory standards.
This equipment contains electrostatic sensitive devices which may be damaged
by careless handling.
Make sure that during installation there is enough minimum clearance and
enough cooling. Climatic conditions must be observed in accordance with EN
50178.
Electrical Connection
Before any installation and connection work, the system must be switched off
and secured. After clearing the frequency inverter the intermediate circuit
capacitors are still charged with high voltage for a short period of time. The unit
can be worked on again, after it has been switched off for 5 minutes.
With frequency inverters that are not isolated from the supply circuit all control
lines must be included in other protective measures (e.g. double insulation or
shielded, earthed and insulated). Further information is found in the technical
documentation part 3.
Connection of the frequency inverter is only permissible on symmetrical networks
with a maximum line voltage (L1, L2, L3) with respect to earth (N/PE) of 300V.
An isolating transformer must be used for supply networks which exceed this
value! The units may be damaged if this is not observed.
The inverter is only designed for a fixed connection, because when using filters
a leakage current > 3.5mA can occur. Protective conductor cross section must
be at least 10mm2 copper or a 2nd conductor must be electrically parallel to the
protective conductor on separate terminals. Ground point-to-point with the
shortest connection possible to mains earth (avoid earth loops).
When using IGBT inverters, high voltage peaks may arise in the motor due to
the switching action of the inverter output devices. These voltage peaks may
damage the insulation of the motor winding and must be taken into account
when using motor cables longer than 15m with high frequency motors. In this
case, the motor can be protected with a motor choke, dv/dt filter or sine filter.
When doing an insulation measurement in accordance with VDE 0100 / Part
620, the power semiconductor of the unit and existing radio interference filters
must be disconnected because of the danger of destruction. This is permissible
in compliance with the standard, since all inverters are given a high voltage test
in the end control at KEB in accordance with EN 50178.
When using components without isolated inputs/outputs, it is necessary that
equipotential bonding exists between the components to be connected (e.g.
through the equalizer). Disregard can cause destruction of the components by
the equalizing currents.