User`s manual

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6
7.8.3.2 Flux current controller
The flux current controller is used with a PMS motor when running in closed loop control in the field
weakening area. This function controls negative Id current to PM motor in the field weakening area
that motor terminal voltage do not increase above maximum level (set by field weakening point
voltage, maximum drive output voltage) . Field weakening area operation depends on motor
construction and motor construction may prohibit operation above field weakening area.
If there is instability in the field weakening area, gain can be decreased and/or time constant
increased.
P2.8.5.8 Flux Current Kp ID551
Defines gain for the flux current controller when using a PMS motor. Depending on
motor construction and the ramp rate that is used to go to field weakening area high may
be needed that output voltage do not reach maximum limit and prevent proper motor
control. Too high gain may also lead to unstable control. Integration time is more
significant in this case for control.
P2.8.5.9 Flux Current Ti ID652
Defines the integration time for the flux current controller when using a PMS motor.
Depending on motor construction and the ramp rate that is used to go to field weakening
area, short integration times may be needed that output voltage do not reach maximum
limit and prevent proper motor control. Too fast integration time may also lead to
unstable control.
P2.8.5.10 ExtIdRef ID1730
This reference value can be used for the external control of the motor id-current i.e.
reactive current. Normally there is no need for that as the control uses already the
optimal value. This reference value is additive to drive internal values but, for example,
field-weakening controller can override the given reference in field-weakening
operation.
P2.8.5.11 EnableRsIdentifi ID654
This parameter enables the Rs identification during DC brake current operations and in
closed loop control for every start. If the identification run was made successfully it is
recommended to keep this parameter disabled.