Siemens SINAMICS S120 Function Manual page 625

Definition of the measuring functions
Measuring function
APC open circuit
APC closed circuit
Measuring the encoder
combination using the
speed control loop
Measure encoder combina-
tion and differential position
feedback using the speed
controller reference fre-
quency response
Measuring position control-
ler reference frequency
response
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
8.14 Advanced Position Control (including Active Vibration Suppression)
Configuration
1. As measuring function select "Speed controller reference frequency response"
2. Add signal r3777[1] "APC output value" to the measuring signals.
3. Set the mathematical function:
Bode diagram > Input: r62, output: r3777[1]
Note:
To measure the open circuit, p3761 must be assigned a low derivative action time, e.g.
p3761 = 1 ms.
APC should be deactivated (p3700.0 = 0).
1. The closed circuit can only be measured if a direct measuring system is available.
2. As measuring function select "Speed controller reference frequency response"
3. Add signal r3771[0] "APC load speed actual value" to the measuring signals.
4. Set the mathematical function:
Bode diagram > Input: r62, output: r3771[0].
1. As measuring function select "Speed-controlled system"
2. Add signal r1445 "Actual speed smoothed" to the measuring signals.
3. Set the mathematical function:
Bode diagram > Input: r80, output: r1445
1. As measuring function select "Speed controller reference frequency response"
2. Add signal r1445 "Actual speed smoothed" to the measuring signals.
3. Set the mathematical function:
Bode diagram > Input: r62, output: r1445
Requirement: The position controller function module is activated.
1. As measuring function, select "Free measuring function (without master control)"
2. Connect the function generator output CU.r4834[0] to a free speed setpoint (e.g. p1155
or p1430)
3. Add measuring signals:
CU.r4834[0] and r2560 "LR speed setpoint"
4. Set the mathematical function:
Bode diagram > Input: r4834[0] * p2000/100, output: r2560*(-1)
Factor p2000/100 maps the function generator scaling to the speed.
5. Traverse the axis, for example from an HMI device or the operator panel, with a low
velocity (position controller must be active!).
Start the measurement while the axis traverses.
6. After the measurement has been completed, the function generator connection to the
speed setpoint should be removed (manually)
Function modules
625