Commissioning
Optimising the operating behaviour
Motor magnetising current with vector control
6
6.11
6.11.4
6.11-9
EDSVF9333V EN 3.0-06/2005
6.11.4 Motor magnetising current with vector control
This chapter describes how to optimise the setpoint for the motor
magnetising current (C0095) via the codes C0080 and C1583 in case of
vector control without feedback.
ƒIncaseofvectorcontrolwith feedback the setpoint for the motor
magnetising current is only determined by C0095. An optimisation is
not required. The codes C0080 and C1583 have no effect.
The motor current consists of the exciting and active part. The
magnetisation of the motor is determined by the excitation current
(magnetising current). To create a torque the motor needs active current.
In the vector control mode (C0006 = 1) a magnetising c urrent is injected into
the motor after controller enable. The current level is detected by the
controller from the motor data.
If a too low motor magnetising current is injected after controller enable, the
following drive behaviour occurs:
ƒ The required torque is not achieved at standstill.
ƒ When a high load is accelerated from standstill, the current overshoots.
OC1 c an be activated.
ƒ The machine runs irregularly as the motor is underexcited.
Note!
If the motor magnetising current is too low, Lenze recommends
to operate the controller with sine-wave modulated switching
frequency(C0018=0,1,4,5oder6)only.
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