DC−bus operation
Introduction
Comparison single−axis controllers / multi−axis controllers
7
336
EDS94SPP101 EN 10.2
7.1.2 Comparison single−axis controllers / multi−axis controllers
As controllers of the 9400 Servo Drives series, the "Single Drive, E94xS" are available in
the power range up to 460 A (240 kW) and "Multi Drive, E94AM" are available up
to 59 A (30 kW).
The single−axis controllers ("Single Drive") are designed for connection to AC mains
(3/PE AC). They are equipped with mains rectifiers, mains filters and brake choppers.
The multi−axis controllers ("Multi Drive") are exclusively designed for connection to DC
mains (2/PE DC). They are equipped with DC busbars for easy assembly. In DC−bus
connections, power supply modules are used that contain mains rectifiers and brake
choppers. Mains filters must be specially dimensioned for each DC−bus.
E94AS... E94AM...
=
=
~
~
3
3
AC
M
=
~
3
2
DC
M
AR principle AR principle
Fig. 7−1 Single Drive/Multi Drive
7.1.3 Advantages of a drive system
When several controllers are operated in a DC−bus connection (DC bus), this offers the
following advantages:
ƒ Energy exchange between controllers in generator−mode (braking) and motor−mode
operation.
ƒ The energy exchange reduces the supply power from the AC mains.
ƒ DC−supply modules or feeding single−axis controllers can be dimensioned with a
lower rated power.
ƒ The energy exchange reduces the braking losses in generator−mode operation.
Advantages for installation:
ƒ Only one AC−mains connection (e.g. at the DC−supply module).
ƒ Reduced wiring costs.
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