Chapter 12 Description of Parameter SettingsC2000-HS
12.1-10-7
FOC & TQC Function Control
Default: 0
Settings bit0: ASR controller under torque control
(0: use PI as ASR; 1: use P as ASR)
bit11: Activate DC brake when executing the zero torque command
(0: ON; 1: OFF)
bit12: FOC Sensorless mode, crossing zero means the speed goes from
negative to positive or positive to negative
(0: determined by stator frequency; 1: determined by speed command)
bit15: Direction control in open-loop status
(0: Switch ON direction control; 1: Switch OFF direction control)
Set bit = 0 for closed-loop; any other bit setting for open-loop.
FOC Bandwidth for Speed Observer
Default: 40.0
Settings 20.0–100.0Hz
Setting the speed observer to a higher bandwidth could shorten the speed response time but
creates greater noise interference during the speed observation.
FOC Minimum Stator Frequency
Default: 2.0
Settings 0.0–10.0% fN
Use this parameter to set the stator frequency minimum level in operation status. This setting
ensures the stability and accuracy of observer and avoids interferences from voltage, current
and motor parameter. fN is the motor rated frequency.
FOC Low-pass Filter Time Constant
Default: 50
Settings 1–1000 ms
This parameter sets the low-pass filter time constant of a flux observer at start-up. If you cannot
activate the motor during high-speed operation, lower the setting for this parameter.
FOC Gain of Excitation Current Rise Time
Default: 100
Settings 33–100%Tr (Tr: rotor time constant)
Sets the drive’s excitation current rise time when it activates in sensorless torque mode. When
the drive’s activation time is too long in torque mode, adjust this parameter to a shorter time
value.
Top Limit of Frequency Deviation
Default: 20.0
Settings 0.0–200.0 Hz
Limits the maximum frequency deviation.
If you set this parameter too high, an abnormal feedback malfunction occurs.
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