Lenze 8200 Frequency inverters - Manual (Page 251)

Network of several drives
8200SHB0199 10-8
Protection by F1 ... F3 with alarm contact
Protection of Cable protection
- on the mains side
- on the DC-bus
- on the motor side
Unit protection in the event of
overload
If a supply/input fails because F1 ... F3
blows, the remaining controllers which
are connected will not be overloaded
as the alarm contact switches off the
mains and thus the whole network. No unit protection in the event of
short circuit
Possible faults One or more controllers with
- internal short circuit (+ U
G →
-U
G
)
- internal earth fault (+ U
G →
PE/-U
G →
PE)
- motor-side earth fault on phase W
Risk Several parallel controllers supply the fault location(s) via the DC-bus. This may lead to overload of the
intact controller, as the faulty controller is not selectively activated on the DC-bus.
- Possible damage with central and decentral supply
- destruction of the controller concerned
- destruction of the controllers still intact
- destruction of the supply unit
Note The extent of the destructions depends on the ratio ”DC-bus power of the whole system / rated power of
the controller concerned”.
Protection by F1 ... F3 with alarm contact + F4 ... F5
Protection of Cable protection
- on the mains side
- on the DC-bus
- on the motor side
Unit protection in the event of
overload
If a supply/input fails because F1...F3
blows, the remaining controllers which
are connected will not be overloaded
as the alarm contact switches off the
mains and thus the whole network. Unit protection in the event of
short circuit
Possible faults One or more controllers with
- internal short circuit (+ U
G →
-U
G
)
- internal earth fault (+ U
G →
PE/-U
G →
PE)
- motor-side earth fault on phase W
Risk - Possible damage with central supply
- destruction of the controller concerned
- Possible damage with decentral supply
- destruction of the controller concerned
Note The selective activation of the mains and DC side reduces the extent of destruction.
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