GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 127)

DV-300 Adjustable Speed Drives
——— CONVERTER OPERATION ———
5
51
Carry out the reading of the current circulating in the Flux current parameter (FLUX REGULATION menu)
and insert it in the I field cnst 40 parameter (FLUX REGULATION\Flux if curve menu).
- Disable the converter
- Via the Set flux / if parameter (FLUX REGULATION menu) the calculation of the curve parameters will
be carried out. Enter this parameter then press ENT to execute the calculation.
The procedure requires a few seconds.
- Set the operating mode of the field control (Constant current / Voltage control), set the value of Flux
current max at 100% and save the parameters.
- Changing of Max out voltage or Motor nom flux need a new curve tuning.
Speed-up function
With loads having a high moment of inertia it is possible to check the jumps during the speed changes. They can
be reduced using the function “Speed-up”. The figures 5.3.7.3 and 5.3.7.4 show the influence of this function
Parameters used in the example:
Speed up base 14 ms
Speed up gain 50 %
Speed up filter 20 ms
Setting of the speed zero logic
- The speed zero logic is factory set as disabled. See section 6.7.2, “Speed zero logic”, for a description of
the drive behavior.
- Disable of the I-section of the speed regulator with n=0:
I-section disabled: Enable spd=0 I = Enabled
I-section enabled: Enable spd=0 I = Disabled
n
ote
! When the motor is at a stop, it is possible to avoid the creep of the drive disabling the I sec-
tion. In this case when the motor is at a stop, it can not receive any load and therefore this
function is not suitable for all applications!
Figure 5.3.7.3: Above: Actual spd; Below: Motor cur-
rent jumps with the speed changes due to a high mo-
ment of inertia. The function Speed-up is not active.
Figure 5.3.7.4: Above: Actual spd; Below: Motor
current. The same drive with Speed -up function
active.