Rockwell Automation 1336E IMPACT Adjustable Frequency AC Drive User Manual V 1-4.XX - Manual (Page 319)

Understanding the Auto-tuning Procedure 13-7
The motor inductance measuring routine contains several special
faults. If the drive trips during the inductance test, check bits 1
through 5 of Autotune Errors (parameter 176):
Running the Resistance Test
The drive requires a motor resistance measurement to determine the
references for the regulators that control torque. The motor resistance
test measures the motor resistance and displays it in Stator Resistnce
(parameter 166). The test runs for approximately 10 – 30 seconds.
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 resistance test make sure that you have entered the
correct motor nameplate information.
To run the motor resistance test:
1. Set bit 3 in Autotune/Dgn Sel (parameter 173).
2. Enable the drive.
The drive enable light turns off when the test is complete. When a
reading is obtained in Stator Resistnce, perform the flux test.
file: Autotune
group: Autotune Status
If this bit is set (1): Then:
1
Ind->0 Spd
The motor is not at zero speed. Generally, this bit is set in two cases:
• If the motor rotates during this test, an improper result is likely. Make sure the motor (decoupled from load or process)
is not rotating just before or during the test.
• If the motor is not rotating during this test, then investigate electrical noise creating encoder transitions. Improper
encoder grounding or a noisy encoder power supply could cause noise.
This fault cannot be determined for encoderless applications. You must visually check for this condition on encoderless
systems.
If your motor does rotate during this test, consult the factory.
2
Ind-Sign Err
A sign error fault occurs when the average voltage is negative. If you receive a sign error, you need to:
1. Run the test again.
2. Consider replacing the circuit boards.
3
Ind-0 Cur
If this bit is set, you need to:
1. Set the rated motor current in Nameplate Amps (parameter 4) to the correct value.
2. Run the test again.
3. Consider replacing the control board.
4
Ind-A/D Ovfl
The motor terminal voltage measuring circuit is not working properly. You need to:
1. Determine if the motor is connected.
2. Check cable connections between the gate drive and control boards.
3. Consider replacing the circuit boards.
4. Investigate any noise problems.
5
Ind-En Drop
The drive enable was lost during the inductance test. Consider running the test again and monitor the drive enable (bit 9
of Drive/Inv Status (parameter 15) and/or the Inv En LED on the main control board.
file: Autotune
group: Autotune Results
file: Autotune
group: Autotune Setup