Rockwell Automation 1336T FORCE Series B - Manual (Page 241)

Chapter 6
Troubleshooting
6–29
Rated motor flux is required in order to produce rated torque at rated
current.
Set Parameter 256 Bit 4 to a value of 1. This selects the Motor Flux
Test. This test measures the amount of current required to produce rated
motor flux and displays it in Parameter 238. The motor will accelerate
to approximately two–thirds base speed and then coast for several
seconds. This cycle may repeat several times. The motor will then
decelerate to a low speed before disabling. If the motor will not
accelerate; increase parameter 40 (Torque Limit) until the motor
accelerates. Parameter 41 (Speed Limit) will change the speed the motor
accelerates to.
The Transistor Diagnostics, Phase Rotation, Inductance and
Resistance Tests MUST be run before this test can be performed!
Toggle the start bit in the logic command to start the test. The Drive
enable light will go out when the test is complete. When a reading is
obtained in Parameter 238, record it and then update the torque block
gains. If the test still faults, refer to the flux test faults.
Flux Test Faults: Typical values for rated motor flux range from
20% to 50%. Several faults have been added to identify some problems
that can occur in the flux test. Should the drive trip while the flux test is
being performed, the cause can be found using parameter 297. The
possible faults are detailed in Table 6.D.
Table 6.D
Flux Test Fault Descriptions
Bit # Fault
0 Set
1 Set
2 Set
3 Set
4 Set
5 Set
6 Set
7 Set
Parameter 41 set to less than 33% speed
Parm 238 < 0 Current
Parm 238 > 100% Drive current
Master_Slave enable dropout fault
Not Used
Not Used
Not Used
Not Used
Responses for faults:
Parm 41 set to less than 33% speed: The Autotune speed must be set
higher in order to get a meaningful result out of the flux test.
Parm 238 < 0 Current: This indicates that either 1 or some of the
parameters are incorrectly set, electrical noise is/was present, motor
phasing could be incorrect or other problems exist.
Parm 238 > 100% Drive Current: This identifies flux current greater
than the drive rated current. This may be due to incorrect parameter
settings, an undersized drive for the motor, or a problem motor.
Master–Slave Enable Dropout: This cable interlock between the
Master and Slave drive was opened during the test.
Running the Flux Test