GE Industrial Solutions DV-300 DC Drive Users Manual - Manual (Page 164)

GEI-100332Ga
——— FUNCTION DESCRIPTION ———
6
36
The Speed-up function is used in order to avoid oscillations in presence of loads with a high moment of inertia.
It is made up of a derivative part in the speed feedback circuit, which allows to increase the integral gain of the
speed regulator. It is also useful in case of cyclical non constant loads on the motor (ex. cams). The feedback
applied to the speed regulator is made of two components:
- the motor speed
- the output signal from the Speed up function
This function is mutually exclusive to the Inertia/loss comp function, This selection must be done via the Aux
spd fun sel [1016] parameter. (SPEED REGULAT menu). See section 6.7.1 Speed regulator.
Speed up gain
Speed up function gain as a percentage of Speed up base
Speed up base Speed up function max. gain. The defined value corresponds to 100% of the Speed up
gain parameter.
Speed up filter Time constant of the filter belonging to the D part of the Speed up function.
See example figure 5.3.7.3. and 5.3.7.4.
6.7.4. Droop function
-
+
low pass filter
Zero
T
To Speed
reference
From digital setting or
analog input
T current ref
Load comp
0 %
Droop limit
1500 rpm
Droop filter
0 ms
Droop gain
0 %
Enable droop
Figure 6.7.4.1: Droop compensation
SPEED REGULAT
Droop function
[696] Droop gain [%]
[697] Droop filter [ms]
[698] Load comp [%]
[700] Droop limit [FF]
[699] Enable droop
Parameter description No.
Value
Standard
Configuration min max
Factory
American
Factory
European
Droop gain [%] 696 0.00 100.00 0.00 0.00
Droop filter [ms] 697 0 1000 0 0
Load comp [%] 698 -200 +200 0 0 *
Droop limit [FF] 700 0 2*P45 1500 1500 **
Enable droop
Enabled (1)
Disabled (0)
699 0 1 Disabled (0) Disabled (0)
* This parameter can be assigned to one of the programmable analog inputs.
** This parameter can be assigned to one of the programmable digital inputs.