Lenze i700 Manual - Manual (Page 109)

DC−bus operation
Conditions for trouble−free DC−bus operation
Voltages
7
l
109 EDS700ACBA EN 4.0
7.2 Conditions for trouble−free DC−bus operation
7.2.1 Voltages
The DC−bus operation of controllers is only possible if the rated values of the mains voltage
or DC−bus voltage are identical. The switching thresholds of all brake choppers in the
interconnected system have to be set identically and the control has to be synchronised by
master/slave interconnection.
7.2.2 Number of feeding points
The "i700 servo inverter" series has been designed for drive systems with a central AC
mains feeding point. For this you can use DC supply modules of different power categories.
It is permissible to operate DC power supply modules in parallel in order to increase the
supply or braking power. Using the assigned mains chokes ensures a distribution of the
mains input current in accordance with the rated data.
The spacial arrangement of the DC power supply modules in the network can be selected
freely according to the requirements.
Examples:
ƒ Arrangement of DC power supply modules to the left and right of the axis
interconnection for power increase P
DC
and optimised current distribution in the
busbar system
ƒ Arrangement of DC power supply modules directly next to the axes with dominant
punctual motor power or regenerative power.
I
Tip!
Your Lenze contact person will advise you on further possible supply concepts.
7.2.3 Other conditions
ƒ The entire DC power P
DC
must be provided by the feeding point.
ƒ The controllers of the interconnected system may only start operation when the DC
bus has been charged completely.
ƒ Up to a total current of 100 A, the controllers can be operated via the integrated
DC−bus connections.
– Maximum overload of the busbar for 60 s: 150 % * I
r
with a subsequent 120 s
recovery phase: 75 % * I
r
.
ƒ The DC bus must at no time be overloaded through the required maximum total
power. For this, a time/performance diagram has to be created and considered (see
Basic dimensioning).