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VACON® 3000
Application Guide
The Brake mechanical delay function is used to prevent current and/or torque spikes. This prevents the motor from operating at full
speed against the brake. If you use P3.14.2 at the same time with P3.14.8, it is necessary to have the expired delay and the feedback
signal to release the speed reference.
7.286 (ID 1550) Flux Trace Stabilator Damping Time Constant
Location in the menu: P3.1.4.13.9
Use this parameter to set the damping time constant of the flux trace stabilizer.
7.287 (ID 1551) Flux Stabilator Damping Time Constant
Location in the menu: P3.1.4.13.5
Use this parameter to set the damping time constant of the flux stabilizer.
7.288 (ID 1552) Voltage Stabilator Damping Time Constant
Location in the menu: P3.1.4.13.7
Use this parameter to set the damping time constant of the voltage stabilizer.
7.289 (ID 1568) Torque Control Speed Limiter Mode
Location in the menu: P3.3.2.6
Use this parameter to set the speed limiter operating mode for the torque control.
7.290 (ID 1590) Flying Start Options
Location in the menu: P3.1.4.7
Use this parameter to set the flying start options. The parameter Flying Start Options has a checkbox selection of values.
The bits can receive these values.
•
Search the shaft frequency only from the same direction as the frequency reference
•
Disable the AC scanning
•
Use the frequency reference for an initial guess
•
Disable the DC pulses
•
Flux build with current control
The bit B0 controls the search direction. With the bit set to 0, the shaft frequency is searched in 2 directions, the positive and the
negative. With the bit set to 1, the shaft frequency is searched only in the frequency reference direction. It prevents the shaft move-
ments for the other direction.
The bit B1 controls the AC scanning that premagnetizes the motor. In the AC scanning, the system sweeps the frequency from the
maximum towards zero frequency. The AC scanning stops when an adaptation to the shaft frequency occurs. To disable the AC
scanning, set the bit B1 to 1. If the value of Motor Type is permanent magnet motor, the AC scanning is disabled automatically.
Use the bit B5 to disable the DC pulses. The primary function of the DC pulses is to premagnetize the motor and examine the rota-
tion of the motor. If the DC pulses and the AC scanning are enabled, the slip frequency tells which procedure is applied. If the slip
frequency is less than 2 Hz, or the motor type is PM motor, the DC pulses are disabled automatically.
The bit B7 controls the rotation direction of the injected high frequency signal, which is used in the flying start of synchronous
reluctance machines. Signal injection is used to detect the frequency of the rotor. If the rotor is in a blind angle when the signal is
injected, the rotor frequency is undetectable. Reversing the rotation direction of the injection signal solves this problem.
7.291 (ID 1610) Flying Start Scan Current
Location in the menu: P3.1.4.8
Use this parameter to set the flying start scan current as a percentage of the motor nominal current.
7.292 (ID 1724) Sensorless Control
Location in the menu: P3.1.5.1
Use this parameter to enable the sensorless control function.
Use the advanced sensorless control function in applications where good speed accuracy or high performance at low speed is nec-
essary, but encoder speed feedback is not used. With the advanced sensorless control, a simple closed loop motor control can be
replaced with a high-performance open loop motor control. An example of a possible application is an extruder.
The advanced sensorless control function is not supported when a sine-wave filter or a harmonic filter is used.
Danfoss A/S © 2021.09
Parameter descriptions
AB319735759636en-000101 / DPD01822 | 225
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