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VACON® 3000
Application Guide
•
the supply voltage changes, for example, between -15% and +10%, and
•
the process you control does not have the tolerance for the changes that the undervoltage controller and the overvoltage con-
troller make to the output frequency of the drive.
The undervoltage controller decreases the output frequency of the drive
•
to get energy from the motor to keep the DC-link voltage at a minimum level when the voltage is near the lowest permitted
limit, and
•
to make sure that the drive does not trip because of an undervoltage fault.
The drive can trip when the overvoltage and undervoltage controllers are disabled.
7.118 (ID 609) Torque Limit
Location in the menu:
•
INU application: P3.1.3.6
Use this parameter to set the general maximum torque limit control between 0.0–300.0%. The torque limit applies to both direc-
tions. 100% equals to motor nominal torque.
7.119 (ID 612) Magnetizing Current
Location in the menu:
•
INU application: P3.1.2.7.1
Use this parameter to set the magnetizing current of the motor.
The magnetizing current (no-load current) of the motor identifies the values of the U/f parameters when they are given before the
identification run. If the value is set to 0, the magnetizing current is calculated internally.
7.120 (ID 613) Speed Control KP
Location in the menu:
•
INU application: P3.1.2.4.1
Use this parameter to set the gain for the speed controller as a percentage per Hz.
When the gain value is 100%, the nominal torque reference is produced at the speed controller output for a frequency error of 1 Hz.
7.121 (ID 614) Speed Control I-Time
Location in the menu:
•
INU application: P3.1.2.4.2
Use this parameter to set the integral time constant for the speed controller.
Speed Control Output k = SPC OUT k − 1 + SPC Kp × Speed Error k − Speed Error k − 1 + Ki × Speed Error k
where
SPC Kp × Ts
Ki =
SPC Ti
.
7.122 (ID 617) Current Control KP
Location in the menu:
•
INU application: P3.1.2.3.1
•
AFE application: P3.2.2.1
Use this parameter to adjust the P-gain of the current controller.
This controller is active only in closed loop control mode. The controller generates the voltage vector reference to the modulator..
7.123 (ID 619) Slip Adjust
Location in the menu:
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N O T I C E
Parameter descriptions
AB319735759636en-000101 / DPD01822 | 189
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