User Manual V 1-4.XX User guide

13-6 Understanding the Auto-tuning Procedure
3. Check if the motor is running in what you define as the positive
direction. If it is not, stop the drive, swap the T1 and T2 motor
leads, and return to step 1.
4. For encoder-based systems, with the motor turning in the positive
direction, check that Motor Speed (parameter 81) is positive. If
the value is not positive, swap encoder leads TB3-32 and TB3-34,
and go back to step 1.
Running the Sequential Torque
Tuning Tests
Bits 2 through 5 of Autotune/Dgn Sel control the sequential torque
control tuning tests.
If during any of the next tests bit 0 (negative or zero slip) of Autotune
Errors (parameter 176) is set, then Nameplate RPM (parameter 3) is
less than the motor synchronous speed determined from Nameplate
Hz (parameter 6) and Motor Poles (parameter 7). For example, a
4 pole 60 Hz motor has a synchronous speed of 1800 rpm. Here, a
motor nameplate rpm of 1750 rpm results in 50 rpm, or 1.67 Hz, of
slip.
Running the Inductance Test
A measurement of the motor inductance is required to determine the
references for the regulators that control torque. This test measures
the motor inductance and displays it in Leak Inductance
(parameter 167).
When running this test, you should be aware of the following:
• The motor should not rotate during this test although rated
voltages and currents are present and the possibility of rotation
exists. For encoderless systems, you must visually verify that the
motor does not rotate.
• This test is run at rated motor current and by-passes the normal
current limit functions.
Before running the inductance test, make sure that you have entered
the correct motor nameplate information.
To run the inductance test:
1. Set bit 2 in Autotune/Dgn Sel (parameter 173).
2. Enable the drive.
The drive enable light turns off when the test is complete. The
inductance test runs for approximately 1 minute. When a reading is
obtained in Leak Inductance, perform the resistance test.
Typical values for per unit inductance are in the range of 15% to 25%
motor impedance. The value shown in Leak Inductance is a percent
value. If you are using long wiring runs, the typical value for per unit
inductance should increase by the ratio of wiring inductance to motor
inductance.
Motor Speed is 0 during this test if an encoder is not present.
file:
Autotune
group:
Autotune Results
file:
Autotune
group:
Autotune Setup