GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 116)

GEI-100332Ga
——— CONVERTER OPERATION ———
5
40
5.3.5.1.1 Checking current regulator performance using parameter Eint
While running the drive, monitor the parameter (Eint), located under menu heading “Current Regulator”. This
measure an average internal current error.
Its value should be close to zero, but values dynamically changing between -40 and 40 are acceptable. The drive
must have at least 30% load for this reading to be considered as a valid performance measurement. If
adjustments are needed, make small changes to the parameter (Current regulator\Arm inductance) to fine tune
(Eint) to an acceptable value.
- If Eint is positive value, increase “Arm inductance” value.
- If Eint is negative value, decrease “Arm inductance” value.
5.3.5.2 Self tuning of the speed regulator
Speed Self tuning identifies the total Inertia value at the motor shaft ( Kg*m 2 ), the friction value (or Loss com-
pensation) in N*m and computes the Proportional and Integral gains of the speed regulator.
Warning ! This procedure requires free rotation of the motor shaft coupled to the load. Start/Stop
command is disregarded, therefore it can not be used on drives with limited travel.
Caution ! The test is performed using the torque limit value set in Test T curr lim parameter. The
torque is applied stepwise, with no ramp (profile), therefore the mechanical transmis-
sion must not have significant backlash, and it must be compatible with operation at
the torque limit set in Test T curr lim parameter. The user can reduce the torque limit
to a suitable value via theTest T curr lim parameter.
n
ote
! - Application where the system inertia coupled to the motor shaft is much higher than
the motor inertia value , increase the Test T curr lim parameter to avoid “Time out”
error.
- This procedure is not suitable for use with “hoist” or “elevator” drives.
Preliminary operation before the correct execution of the Speed self tuning procedure is the appropriate calcula-
tion of the Torque const parameter.
Set the motor name plate data parametrs:
Motor max speed Set the maximum motor speed value
Flux weak speed Motor max speed percentage where the flux weakening range starts. (Crossover
point)
T Current limit +/- Set the nominal motor current value
Motor nom flux Set the Motor nom flux in Amps.
Max out voltage Set the maximum armature voltage value
With speed regulator self tunig performed, the above parameters value can be changed according to the
application without Torque const parameter modification.
- Set the motor shaft direction: Forward or Reverse via the Fwd-Rev spd tune parameter
- Select the torque current value to be used during the test via the Test T curr lim parameter