Siemens SINAMICS G130 - Page 473

Functions, monitoring, and protective functions
9.3 Extended functions
Inverter chassis units
Operating Instructions, 07/2016, A5E00331449A
473
You can configure the moment of inertia precontrol via p5310.
● Using bit 0, you can activate the calculation of the characteristic (p5312 … p5315).
● Using bit 1, you can activate the moment of inertia precontrol.
The following bit combinations are possible:
p5310.0
= 0,
p5310.1
= 0
Moment of inertia precontrol not active
p5310.0
= 0,
p5310.1 = 1
Cyclic calculation of the coefficients without moment of inertia pr
e-
control (commissioning)
p5310.0
= 1,
p5310.1 = 0
Moment of inertia precontrol activated (without cyclic calculation o
f
the coefficients)
p5310.0
= 1,
p5310.1 = 1
Moment of inertia precontrol activated (with cyclic calculation of the
coefficients)
The status word of the moment of inertia precontrol is indicated in r5311.
Example
For a horizontal conveyor, in a first approximation, the moment of inertia depends on the
load.
Figure 9-26 Relationship between moment of inertia J and load torque M
L
The relationship between load torque and torque is saved in the inverter as linear
characteristic.
● In positive direction of rotation:
Moment of inertia J = p5312 x load torque M
L
+ p5313
● In negative direction of rotation:
Moment of inertia J = p5314 x load torque M
L
+ p5315
You have the following options to determine the characteristic:
● You already know the characteristic from other measurements. In this case, you must set
the parameters to known values when commissioning the system.
● The inverter iteratively determines the characteristic by performing measurements while
the motor is operational.