5 defining the current limit (imax controller), Defining the current limit (imax controller), 6motor interface – Lenze E94AxPExxxx User Manual
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Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06
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6
Motor interface
6.6
V/f control (VFCplus)
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6.6.1.5
Defining the current limit (Imax controller)
The current limit for the Imax controller is defined by the maximum current which must be set in
. If the motor current exceeds the value set in
, the Imax controller gets active.
• The Imax controller changes the field frequency so that the motor current does not exceed the
current limit. In motor mode, the frequency is reduced and in generator mode it is increased.
• Gain and reset time of the Imax controller can be parameterised in
Short overview: Parameters for Imax controller
Optimising the Imax controller
• If oscillations occur during operation at the current limit, the Imax controller has to be
decelerated:
• Reduce gain (
)
• Increase reset time (
• If the Imax controller does not operate fast enough after having exceeded the current limit, it
must be accelerated:
• Increase gain (
)
• Reduce reset time (
Parameter
Info
Lenze setting
Value Unit
Maximum current
0.00 A
VFC: Gain - Imax controller
0.001 Hz/A
VFC: Reset time - Imax controller
100.0 ms