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Electrical Installation 5
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07-02-10-01-E-V0505.doc Product Manaul Type: 637f 53
5.7 Correction of supply current
Attention in case of continous load:
Due to the capacitive input impedance of
DC-Bus, the input current is deformated.
This guides to RMS -values higher than the sinus-based calculated values. Fuses,
contactors and line filters have to be selected in respect to this effect.
In typical servo application with Stop/Go-operation (S3-Operation), the
rating to nominal data will be sufficient.
In other cases, the value has to be corrected using the following diagram.
Example:
Drive type 637f/KD6R16.S5-7 is supplied by AC 230V 3-ph.
Output-power: Pout = 200V x 16A x 1,73 = 5,54 kW
This output-power must be generated by:
calculated supply-current Iac sinus = 5,54kW / (230V x 1,73) = 13,9 A
Correction-Factor from diagram: 1,6
RMS. Supply-Current Ieff = Iac sinus x 1,6 = 22,3 A
Result:
All supply-equipment has to be selected in respect to the enhanced current.