Gear Backlash Compensation - ABB DCS 500B Description

curve 3
P9
P10
P11
P12
P13
P8
Gear Backlash
Compensation
DCS 500 Software Description
The function can be graphed using the 5 points determined by the
parameter settings.
Within the next figure there are 3 possibilities shown together with
the outlooking of the curve and the parameter setting.
curve 1
curve 2
P9 430 P9 4095
1150
P10
600 P10 2800
3800
P11 1250 P11
4750 1900
P12
2250 P12 1350
3800
P13 4500 P13
2000 800
P8
4000 4000 P8 4000
Figure 20
In default condition the parameters _LIM_Nx are set to 4 times
nominal current and _LIM_SPEED is set to 20000 = 100% speed to
disable the function. The values of the parameters P2310 to P2314
don´t need to be in a specific order (e.g. not constantly increasing /
decreasing, see above). Dependend on the function of the arma-
ture current over speed range the following steps should be ap-
plied:
specify the MAX_CURR_LIM_SPEED (2309)
-
set the ARM_CURR_LIM_N1 (2310); the converter will use this
-
value for the speed range between zero speed and P2309;
please keep in mind, that all other limitations have to be in-
creased, if more than nominal motor current is demanded
(scale: 4095 = nominal current of motor)
the speed range between the speed specified via P2309 and
-
top speed (100% or 20000) is splitted into 4 even parts
- set the ARM_CURR_LIM_N2 (2311); to a current value,
needed at point 1/2
do the same with the other pairs
-
The gear backlash compensation function can be used for back-
lash-affected drives. When the torque reference is changing direc-
tion, the torque limit is reduced for a while. Parameter
GEAR.START TORQ (2315) defines the torque limit after the
torque direction change. Scale: 4000 = nominal torque of motor
CURRENT LIMIT
2310
... _LIM_N1
2311
... _LIM_N2
2312
... _LIM_N3
2313
... _LIM_N4
2314
... _LIM_N5
2309
... _LIM_SPEED
Speed dependant current limitation (example)
Functional Software description
curve 2
curve 3
curve 1
Speed
1/4 2/4 3/4 20000
39