Lenze 8200 Frequency inverters - Manual (Page 246)

Network of several drives
8200SHB0199 10-3
10.2.2 Mains connection
10.2.2.1 Cable protection/cable cross-section
-
Mains fuses and cable cross-section of the mains cables must be selected
according to the mains current which results from the input power P
DC100
%
. Observe national standards, temperatures and other conditions.
-
Rule of thumb for the mains current in networks:
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-
See page 10-10.
10.2.2.2 Mains choke/mains filter
-
Use the mains chokes/mains filters assigned to the network operation.
Function:
- Mains-current limitation
- Current/power symmetry of the mains input circuits of the controllers in
decentral network operation.
-
Mains choke/mains filter must be selected according to the mains current
and the required radio interference suppression (see page 10-11).
10.2.2.3 Controller protection
Switch-on conditions
-
Ensure simultaneous mains connection of all controller connected
to the network.
Mains-failure detection at the controller when selecting decentral
supply
-
Monitoring of the mains supply of each controller:
- In the event of failure, the controllers still connected to the mains can be
overloaded.
-
Measure:
- Switch-off the whole drive network, if a mains supply fails.
-
Possibilities for detecting/indicating mains failures:
- Application of mains fuses with alarm contact.
- Application of thermal overcurrent releases (bimetall relay), which is
connected after the mains fuses.
- Application of power switches with thermal and magnetic releases as well
as integrated alarm contact to protect the cable.
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