Electrical Connection - KEB COMBIVERT R6 Instruction Manual

Safety Instructions
2.3

Electrical connection

Note Capacitor
Discharge Time
Secure
Isolation
Voltage With
Respect To
Ground
Earthed Exter-
nal
Conductor
Only Fixed
Connection
Insulation Mea-
surement
Different Earth
Potentials
Before any installation and connection work, the system must be switched off and secured.
After clearing the DC link 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.
The terminals of the control terminal strip are securely isolated in accordance with EN
61800-5-1. With existing or newly wired circuits the person installing the units or machines
must ensure that the EN requirements are met. 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).
Connection of the COMBIVERT R6 is only permissible on symmetrical networks with a maxi-
mum line voltage (L1, L2, L3) with respect to earth (N/PE) of 317V. An isolating transformer
must be used for supply networks which exceed this value ! The units may be damaged if
this is not observed.
The COMBIVERT R6 can be connected to power systems with earthed external conductors
(e.g. delta power systems) if the following exceptions apply:
• the control system is no longer regarded as "safe isolated circuit", further protection
measures are required therefore
• with this type of power system, the max. voltage phase / earth must not exceed 550 V
absolute
• external DC fuses at the DC connections are necessary for the 400 V class. Use the
COMBIVERT R6-S without internal DC fuses.
The COMBIVERT R6 is designed for fixed connection only as discharge currents of > 3.5
mA may occur especially when using EMI filters. Therefore it is necessary to lay a protective
conductor with a section of at least 16mm2 (copper) or a second protective conductor in
compliance with EN 61800-5-1. Ground point-to-point with the shortest connection possible
to mains earth (avoid earth loops).
When doing an insulation measurement in accordance with VDE 0100 / Part 620, the po-
wer 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). Disre-
gard can cause destruction of the components by the equalizing currents.
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