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Diagnostics Optimization CT MODBUS RTU Technical Data
202 E300 Design Guide
Issue Number: 1
The table below shows the parameters required for motor control indicating which should be set by the user and which can be measured with an auto-
tune test.
Auto-tune test 1: Basic control parameters
This test measures the basic control parameters without moving the motor.
1. A stationary test is performed to measure Stator Resistance (B34), Transient Inductance (B33), Maximum Deadtime Compensation (B46) and
Current At Maximum Deadtime Compensation (B47).
Auto-tune test 2: Basic control and improved performance parameters
This test measures the parameters for improved performance by rotating the motor.
1. Auto-tune test 1 is performed.
2. A rotating test is performed in which the motor is accelerated with the currently selected ramps up to a frequency of Motor Rated Frequency (B06)
x
2
/
3
, and the frequency is maintained at that level for 4 seconds. Stator Inductance (B35) is measured and this value is used in conjunction with
other motor parameters to calculate Motor Rated Power Factor (B04). The motor should be unloaded for this test.
The table below shows the trips that can occur during an auto-tune test:
The following describes how an auto-tune test can be initiated and normal operation can be resumed after the test for RFC-A mode:
1. An auto-tune test cannot be initiated if the drive is tripped or the drive inverter is active, i.e. Drive OK (L05) = 0 or Drive Active (L06) = 1. The
inverter can be made inactive by ensuring that the Final drive enable is inactive, or the Final drive run is inactive.
2. An auto-tune test is initiated by setting Motor Autotune (B11) to a non-zero value and making the Final drive enable and the Final drive run active.
3. All tests that move the motor will move the motor in the forward direction if Direction Input 2 CW (G40) = 1 and Direction Input Invert (H12) = 0, or
the reverse direction if Direction Input 1 CCW (G39) = 1 Direction Input Invert (H12) = 0.
4. If the auto-tune sequence is completed successfully the Final drive enable is set to the inactive state and Motor Autotune (B11) is set to zero. The
Final drive enable can only be set to the active state again by removing the enable and reapplying it.
5. If a trip occurs during the auto-tune sequence the drive will go into the trip state and Motor Autotune (B11) is set to zero. As in 4. above the enable
must be removed and re-applied before the drive can be restarted after the trip has been reset. However, care should be taken because if the
auto-tune was not completed the drive parameters that should have been measured and set up will still have their original values.
Parameter Required for Measured in test
Motor Rated Frequency (B06) Basic control
Motor Rated Current (B02) Basic control
Motor Rated Speed (B07)
Slip compensation
Spinning start
Motor Rated Voltage (B03) Basic control
Motor Rated Power Factor (B04) Basic control 2
Number Of Motor Poles, Motor Number Of Motor Poles (B05) Not used
Stator Resistance (B3
4) U
r, Ur I, Ur S and Ur Auto modes Spinning start 1, 2
Transient Inductance (B33) Improved performance 1, 2
Stator Inductance (B35) Improved performance 2
Maximum Deadtime Compensation (B46) Basic control 1, 2
Current At Maximum Deadtime Compensation (B47) Basic control 1, 2
Trip Reason
Trip can
occur in test
Autotune Stopped The final drive enable or the final drive run were removed before the test was completed. All
Resistance.001
The measured value of Stator Resistance (B34) exceeded a value of (V
FS
/ √2) / Drive Full Scale Current Kc
(J06), where V
FS
is the full scale d.c. link voltage.
All
Resistance.002
It has not been possible to measure the drive inverter characteristic to define Maximum Deadtime
Compensation (B46) and Current At Maximum Deadtime Compensation (B47).
B11 Motor Autotune
Mode RFC-A
Minimum 0 Maximum 2
Default 0 Units
Type 8 Bit Volatile Update Rate Background read
Display Format Standard Decimal Places 0
Coding RW, TE, NC
Value Text
0None
1Static
2Rotating
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