Auto-Tuning For Sensorless Vector Control - Hitachi SJ100 Series Instruction Manual

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Auto-tuning for Sensorless Vector Control

Auto-tuning for Sensorless Vector Control
The SJ100 inverter has a built-in auto-tuning algorithm. Its purpose is to detect and
record the motor parameters to use in sensorless vector control. As you may recall from
Chapter 3, sensorless vector control (SLV) is the more sophisticated control algorithm
the SJ100 inverter can use to deliver higher torque levels at different speeds. Using
parameter A44, you can select from the following:
• 00 = Variable frequency with constant torque
• 01 = Variable frequency with reduced torque
• 02 = Sensorless vector control (SLV)
NOTE: Although "auto-tuning" is often associated with PID loops, the PID loop in the
SJ100 inverter is not directly affected by the auto-tuning procedure or parameters.
Most of the "H" Group parameters are dedicated to storing SLV parameters. The inverter
comes from the factory with default settings for these parameters. To benefit fully from
SLV control, you must use A44 to select SLV control, and initiate the auto-tuning
calibration procedure as described below for your motor. During the procedure, the
inverter will write new values for the "H" Group settings related to SLV control. The
settings have a second set of parameters for a second motor. The factory default configu-
ration will apply auto-tuning to the first motor.
WARNING: You may need to disconnect the load from the motor before performing
auto-tuning. The inverter runs the motor forward and backward for several seconds
without regard to load movement limits.
Follow the steps below to auto-tune the inverter (table continued on next page):
Parameter
Step
Code
1 F02 Acceleration time
2 F03 Deceleration time
3 H03 Motor capacity
4 H04 Motor pole count
5 A01 Frequency
command source
6 A03 Base frequency
7 A20 Multi-speed 0
setting
Parameter Setting or Action
Name
Set to a time greater than 10
seconds
Set the same as setting F02
Varies with inverter (default
value will be correct)
Set the poles 2 / 4 / 6 / 8 to
match motor
Set = 02 (selects parameter F01
as source of output frequency)
Set = 50 or 60 for your motor
Set A20 > 0
Notes
Parameters F02 and F03 must be
equal in order for the moment of
inertia data to be correct.
Increase the time if over-current
or over-voltage trip event occurs.
Setting is in kW
Refer to the motor specifications
label
The auto-tuning procedure will
automatically control the speed
Default= 50 (Europe) / 60(US)
If A20 = 0, auto-tuning is not
performed