Butt’s Pumps and Motors - page 423

17
Information
OTHER APPLICATION CONSIDERATIONS –
For proper selection, the following should be considered:
UÊÊ œÀÃi«œÜiÀʜÀÊ̜ÀµÕiÊÀiµÕˆÀi“i˜ÌÃÊ>ÌÊÛ>ÀˆœÕÃÊëii`ð
UÊÊ iÈÀi`Êëii`ÊÀ>˜}iʜvÊÌ iʏœ>`Ê>˜`ʓœÌœÀ°
UÊÊ Ê VViiÀ>̈œ˜Ê >˜`Ê `iViiÀ>̈œ˜Ê À>ÌiÊ ÀiµÕˆÀi“i˜ÌÃÊ œvÊ Ì iÊ
process being controlled.
UÊÊ Ê-Ì>À̈˜}ÊÀiµÕˆÀi“i˜ÌÃʈ˜VÕ`ˆ˜}ÊÌ iÊvÀiµÕi˜VÞʜvÊÃÌ>À̈˜}Ê>˜`Ê
a description of the load (reflected inertia at the motor, load
torque during starting).
UÊÊ Ê7 iÌ iÀÊÌ iÊ>««ˆV>̈œ˜ÊˆÃÊ>ÊVœ˜Ìˆ˜ÕœÕÃÊ«ÀœViÃÃʜÀÊ`ÕÌÞÊVÞViÊ
of starts, stops and speed changes.
UÊÊ Ê Ê }i˜iÀ>Ê `iÃVÀˆ«Ìˆœ˜Ê œvÊ Ì iÊ ÌÞ«iÊ œvÊ >««ˆV>̈œ˜Ê ˆ˜VÕ`ˆ˜}Ê
the environment in which the VFD system components must
operate (determines motor enclosure and/or explosion proof
classification).
UÊÊ Ê iÃVÀˆ«Ìˆœ˜ÊʜvÊÊÌ iÊÊ>Û>ˆ>LiÊÊiiVÌÀˆV>Ê«œÜiÀÊÃÕ««ÞÊ>˜`Ê
wiring.
UÊÊ -«iVˆ>Ê«iÀvœÀ“>˜ViÊÀiµÕˆÀi“i˜ÌÃ]ʈvÊ>˜Þ°
UÊÊ Ê7 iÌ iÀÊÌ iÊ`ÀˆÛiÊ܈ÊLiÊVœ˜vˆ}ÕÀi`ÊÜˆÌ Ê>ÊLއ«>ÃÃÊVˆÀVՈ̰Ê
In case of its deployment, the motor will operate like its fixed
speed counterpart and may require a NEMA B design which
limits in-rush current, or selection of a larger motor starter or
other protective circuitry.
UÊÊ œ>`Êà >Àˆ˜}
UÊÊ œÕ˜Ìˆ˜}Ê>˜`ÊœÌ iÀʓiV >˜ˆV>ÊVœ˜Ãˆ`iÀ>̈œ˜Ã
Typical Temperature Rise Of Various Enclosures
Variable Speed Operation