Lenze 8400 StateLine - Manual (Page 134)

5 Motor control (MCTRL)
5.4 V/f characteristic control (VFCplus)
134
Lenze · 8400 StateLine · Reference manual · DMS 12.0 EN · 06/2014 · TD05/TD14
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

Note!
87-Hz operation
4-pole asynchronous motors which are designed for a rated frequency of f = 50 Hz in star
connection can be operated in delta connection when being constantly excited up to f =
87 Hz.
• Advantages:
• Higher speed-setting range
• 73% higher power output in case of standard motors
• Motor current and motor power increase by the factor .
• The field weakening range starts above 87 Hz.
• Generally, this process can also be used with motors which have different numbers of
pole pairs. In case of 2-pole asynchronous motors, the mechanical limit speed must be
maintained.
3