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Installation and user guide
Rev: 4.0
NTT 240/460
Operation mode
6.17.2 Setting sensorless parameters
The main window for sensorless setting parameters is shown in the image below, reporting default data:
Covariance-noise
window shows sensorless regulation parameters sensorless:
•
Covariance current
: sensorless regulation parameter; range between 0.01 and 650.00;
•
Covariance speed
: sensorless regulation parameter; range between 0.01 and 650.00;
•
Covariance phase
: sensorless regulation parameter; range between 0.0001 and 6.5000;
•
Current noise
: sensorless regulation parameter; range between 0.01 and 650.00;
Parameters start
window allows to set:
•
Starting current:
current provided by drive to motor in order to guide the shaft to initial position; this
parameter is percentage related to Nominal current parameter.
•
Current ramp
: ramp, in seconds, to reach starting current.
•
Initial speed
: speed parameter, in RPM, beyond which drive changes control algorithm, from V/F to
sensorless.
•
Speed Hysteresis
: it’s reffered to initial speed; this parameter is shown in RPM.
•
Speed ramp
: ramp, in RPM/s, to reach initial speed from zero speed.
•
Initial delay
: time parameter beyond which drive starts to follow speed reference; the delay is necessary
to let the motor shaft to reach the corrrect start position.
Setting
windows allow to set:
•
Zero crossing mode parameter
: it’s available as
Continuous
or
Stop-Start
. Continuous mode allows to cross
zero speed without the stop procedure, when a speed reference inversion occurs. Otherwise, Stop/
Start mode let the drive to change into V/F control and perform the starting procedure in accordance
with parameters shown into
Parameters start
window.
•
Stationing current
: when SWITCH-ON command is provided to drive, this parameter shows the 0 speed
current that drive must provide to motor; this parameter is percentage related to Nominal current
parameter.
•
Fault measured speed
: speed parameter, in RPM, beyond which drive provides alarm.
Содержание NTT 240
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