Dc−bus operation – Lenze E82xVxxxKxxxxx User Manual
Page 475
DC−bus operation
Fuses and cable cross−sections
Protection in DC−bus operation
l
475
EDS82EV903−3.0
With mains fuses with monitoring function (F1 ... F3)
Cable protection
Device protection in the event
of overload
No device protection in the
event of short circuit
Protective
function
l
On the supply side
l
On the DC busbar
l
On the motor side
In the event of a failure of a
supply point due to the
response of F1...F3, the other
controllers in the DC−bus
system are not overloaded. The
signalling contact disconnects
the mains for the entire DC−bus
system.
Possible errors
One or more controllers with
l
device−internal
short circuit (+U
G
Õ −U
G
)
l
device−internal earth fault (+U
G
ÕPE/−U
G
ÕPE)
Risk
Multiple controllers connected in parallel supply the fault location(s) via the DC busbar. This
may lead to the intact controllers being overloaded because the faulty controller cannot be
activated individually.
Possible damages with central and decentralised supply
l
The faulty controller is destroyed
l
Still intact controllers are destroyed
l
The power supply unit is destroyed
With mains fuses with monitoring function (F1 ... F3) and DC fuses (F4 ... F5)
Cable protection
Device protection in the event
of overload
Device protection in the event
of short circuit
Protective
function
l
On the supply side
l
On the DC busbar
l
On the motor side
In the event of a failure of a
supply point due to the
response of F1...F3, the other
controllers in the DC−bus
system are not overloaded. The
signalling contact disconnects
the mains for the entire DC−bus
system.
Possible errors
One or more controllers with
– device−internal
short circuit (+U
G
Õ −U
G
)
– device−internal earth fault (+U
G
ÕPE/−U
G
ÕPE)
Risk
Possible damages with central and decentralised supply
l
The faulty controller is destroyed
Comment
The selective activation on the supply side and on the DC−bus side reduces the extent of
possible consequential damages.