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
Stationary
Connection
Insulation Mea-
surement
Different Earth
Potentials
GB - 8
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 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 305V. 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 "securely isolated circuit", further protection
measures are therefore required
• • with this type of power system, the max. voltage phase / earth must not exceed 528 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. In accordance with EN 61800 - 5 - 1 the
following cross sections of the protective earth conductor must be used:
Cross-section Minimum cross-section of the protective earth conductor
of the phase
conductors
10 mm² CU or
<10 mm²
additional connection terminal for a second protective earth conductor
with the same cross-section as the phase conductor
10...16 mm² Protective earth conductor with cross-section as phase conductor
16...35 mm² Protective earth conductor with a cross-section of 16 mm²
Protective earth conductor with a cross-section of 50 % of the phase
>35 mm²
conductor.
When performing an "Insulation Test" or "Voltage Test" on the complete electrical system (as
required in EN 60204-1 / VDE 0113-1) the inverter and EMI - filter have to be disconnected
(because of danger of destruction). This is in compliance with the given standard because
KEB inverter are 100 % voltage tested at manufacturing output routine test. In case of spe-
cial requirements contact KEB for further information.
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.