Lenze 9200 Series Operating Instructions Manual page 17

• When selecting the power of the supply module, proceed as
follows to find out about the required input power.
1. Determine the power profile of all axis modules connected to
the DC-bus by means of the process profile and the load
torques during a system cycle.
2. The power losses are stated in the technical data, for units
the losses are stated during rated power and for motors the
power loss during rated operation. These losses are
assumed to be constant during the whole cycle.
3. Find out the resultant powr by adding the power losses and
the power profiles:
calculate a positive motor power
and a negative generator power.
4. Determine the effective power during the system cycle:
Do not calculate a negative resultant power (generator
power). These ranges can taken into consideration when
calculating the effective brake power.
5. Select the supply module according to the effective power
during a system cycle:
Please note that the supply module must have enough
capacity to supply the effective peak power and that, in the
event of mains voltage reductions, the permissible power of
the supply module will be reduced according to the reduction
of the mains voltage.
6. If the calculated effective permanent power exceeds the
permissible value of the supply module 9217:
Subdivide the DC-bus sets and install further supply
modules.

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