Project Planning; Important Information; Energy Management; Control Cabinet - Beckhoff AX8000 Series Manual

Project planning

9 Project planning
9.1

Important information

The more thoroughly a machine or plant project is thought through in advance, the less risk there is of having
to carry out expensive modifications during or after commissioning. This applies to both the mechanical and
electrical design. This section can only give a rough overview of electrical design.
9.2

Energy management

If the quality of the mains supply is impaired due to wide fluctuations in voltage, then both the servo drive
specification and the speed range of the motor will need to be considered. With a positive tolerance for
voltage fluctuation the upper limit value of the wide voltage input of the AX8000 needs to be taken into
account. With a negative tolerance of the voltage fluctuation it must be checked whether the decrease in
speed caused by the low voltage is permissible. With these motors what is known as field weakening
operation (check availability) of the servo drive may provide a solution. If the mains supply does not meet the
specifications for operation of the AX8000, then isolating transformers, mains chokes, mains filters or other
measures may be required. An energy efficient drive system operates in a drive system with a shared DC
link and shared internal and possibly also external brake resistors. If you are already using similar drive
systems, the AX8000 offers a convenient diagnostic system for determining the load on the brake resistors
and for transferring the values. Previous experience with drive systems shows that in such a system much
smaller or even no external brake resistors need to be used.
The Beckhoff software "TCMotionDesigner" is available for energy management purposes.
9.3

Control cabinet

The dimensions of the control cabinet must be sufficient to accommodate all components with the specified
distances. Remember that high temperatures may necessitate forced cooling. Position the control cabinet as
close as possible to the machine so that the motor cables can be as short as possible. In addition, the
control cabinet should have an earthed metal rear panel to which the AX8000 incl. periphery are attached so
that safe earthing can be guaranteed. If you are unable to guarantee these conditions you need to earth the
AX8000 and the relevant components using an approved cable of adequate size.
9.4

Drive train design

Application, servo drive, motors and gear mechanism must be adapted to each other so that there is an
adequate safety margin for all components as a degree of sluggishness appears over time due to high
temperatures or wear. Make sure that the components in the working area of the system have adequate
reserves so that the working life is not impaired and the necessary control quality can be maintained.
The Beckhoff software "TCMotionDesigner" is available for configuration of the drivetrain and selection of
suitable components.
50 Version: 1.6 Multi axis servo system AX8000