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undervoltage in the network. If the frequency inverter has limiter functions (which limit the maximum frequency un-
der such circumstances to ensure operational safety), the reserve can possibly be selected smaller.
▶ Consider overload capacity for compressor start
Additionally, a compensation factor F
for the current during compressor start must be allowed for. For scroll com-
C
pressors this factor is: F
= 1.2. It is multiplied by the "Max. operating current" that the BITZER SOFTWARE indic-
S
ates for the respective motor in the tab "Technical data" (see below). This maximum current must be within the
short-term overload capacity of the frequency inverter, otherwise a larger one is necessary.
Fig. 9: The "Max. operating current" indicated in the BITZER SOFTWARE (here: 41.3 A)
multiplied by the compressor-specific compensation factor (for scroll compressors: F
= 1.2)
S
gives the necessary short-term overload capacity of the frequency inverter.
For BITZER VARIPACK frequency inverters (see above), this is already taken into account by design.
EST-420-6 // PDF Download
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