Functional Software description
DCS 500 Software Description 39
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.
... _LIM_N1
20000
Speed
1/4 2/4 3/4
CURRENT LIMIT
2309
P8 4000
2310
P9 4095
2311
P10 2800
2312
P11
1900
2313
P12
1350
2314
P13
800
... _LIM_N2
... _LIM_N3
... _LIM_N4
... _LIM_N5
... _LIM_SPEED
curve 1
P8
4000
P9
430
P10
600
P11 1250
P12
2250
P13 4500
curve 1
curve 2
curve 2
P8
4000
P9
1150
P10
3800
P11
4750
P12 3800
P13
2000
curve 3
curve 3
Figure 20 Speed dependant current limitation (example)
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
Gear Backlash
Compensation
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
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