Yaskawa DSD 406 - Manual (Page 58)

3 Operation
54 3/21/96
WARNING
Armature current is circulated through the armature
circuit during parts of the PCU Parameter Measurement
function. The PCU will reduce the field current to zero on
motors with a shunt field in order to minimize motor
rotation. However, a PERMANENT MAGNET motor
must have its shaft locked mechanically prior to running
the PCU Parameter Measurement routine. If the PCU
detects significant motor voltage during the test, the PCU
parameter measurement function will abort.
Self-Tune (PCU Parameter Measurement)
Self-Tune (PCU
Parameter
Measurement)
If the drive is still in a run condition: To correct, put the drive in a stop
condition and press the DATA/FCTN key to continue with loading defaults.
If the NVRAM protection switch is “ON”: To correct, turn off the NVRAM
protection switch and press the DATA/FCTN key to continue with loading
defaults.
The DSD drive has a built-in current regulator SELF TUNING feature. When
activated, this feature measures total motor armature circuit resistance,
inductance including wiring, and the field L/R time constant. The drive then
uses the measured value in conjunction with the parameter entered for
“crossover frequency” to calculate integral and proportional gains for the current
regulator and to set the field regulator gains properly. After running the PCU
Parameter Measurement function, the values for armature resistance and
armature inductance are stored in NVRAM. Note that the NVRAM protection
must be turned “OFF” so that the results can be stored. It is possible to override
the values dynamically calculated for armature resistance and inductance values
by disabling the “USE SELF-TUNE” item in the parameter menu.
The dynamically calculated values are used if “USE SELF-TUNE” is set to
“ON” while the manually entered values are used if this item is set to “OFF”.
Prot
The drive will then do a complete reset and the program defaults are now
loaded.
If the SCDU display does not change to LOAd, the following may display.
St0p