Yaskawa Portable Control Display Unit - Manual (Page 50)

6 TEST MENU
44 Self-Tune
01/22/96
Self-Tune / Power
Conversion Unit
Parameter
Measurement
Function # 997
The DSD drive has a built-in current
regulator SELF TUNING feature. When
activated, this feature measures total motor
armature circuit resistance and inductance,
including wiring. The drive then uses the
measured values in conjunction with the
parameter entered for “CROSSOVER
FREQUENCY” to calculate integral and
proportional gains for the current regulator.
After running the Power Conversion Unit
Parameter Measurement function, the
values for armature resistance and armature
inductance are stored in NVRAM. It is
important to note that it is possible to
override the values that have been
dynamically calculated for armature
resistance and inductance by 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”.
WARNING
Current is circulated through the
armature circuit during the
Power Conversion Unit
Parameter Measurement
function. The Power
Conversion Unit 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 Power
Conversion Unit Parameter
Measurement routine. If the