User`s manual

162 • Vacon apfiff09 marine
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6
7.8.2 Close Loop Settings
P2.8.4.1 Current control P gain ID617
Sets the gain for the current controller. The controller generates the voltage vector
reference to the modulator. The gain is also used in open loop flying start. When the Sine
filter parameter (parameter P6.7.5 in the System menu) has been set to Connected the
value of this parameter is changed to 20.00 %.
The value is also identified when using a PMS motor and making identification run with
rotating motor. At low speed the motor values may increase up to 300 %. At high speed
motor gain and motor with sine filter may have gain values of 10...40 %.
P2.8.4.3 Current control Ti ID657
Current controller integrator time constant.
P2.8.4.3 Slip adjust ID619
The motor name plate speed is used to calculate the nominal slip. This value is used to
adjust the voltage of motor when loaded. The name plate speed is sometimes inaccurate
and this parameter can therefore be used to trim the slip. Reducing the slip adjust value
increases the motor voltage when the motor is loaded.
P2.8.4.4 Acceleration compensation ID626
Sets the inertia compensation to improve the speed response during acceleration and
deceleration. The time is defined as acceleration time to nominal speed with nominal
torque. This function is used when the inertia of the system is known to achieve the best
speed accuracy when reference is changed.
Acceleration compensation is added to TorqueReferenceActual i.e. torque is added after
speed controller. The speed controller can, therefore, be tuned only for speed error and
the acceleration compensation makes sure that the system inertia does not affect the
speed controller.
SPC Out
Freq.Out
Acceleration compensation not in use