Measurement Of Current Control Loop - Siemens SINUMERIK 840D sl Commissioning Manual

Drive tuning
10.5 Measuring functions (manual tuning)
● No controller enabling command
● Canceling drive enable
● Canceling traversing enable
● Selection of parking (in position-controlled operation).
● Feed override = 0%
● Spindle override = 50%
● Change in operating mode (JOG) or operating mode JOG not selected
● Actuation of traversing keys
● Actuation of handwheel
● Alarms leading to axis shutdown
10.5.1

Measurement of current control loop

Function
The current control loop only needs to be measured for diagnostic purposes if there is a fault
or if there is no standard data for the motor / power unit combination (third-party motor).
For SINAMICS S120, it is possible to measure the input/output behavior of the current control
loop directly in the speed controller without needing to open it. For this reason, measurements
in the speed controller are preferable. The user is made aware of this advantage as red text in
the center of the "Measurement selection" dialog.
The preferred method for measuring the dynamic response of the current controller is the
"Reference frequency response with active speed controller" measuring type. The other
measuring types are only for experts or for comparison measurements of motors not decoupled
from the mechanical components.
NOTICE
Safety measures for hanging/suspended axes
For hanging/suspended axes, measuring the current control loop requires that users apply
special safety measures, for instance:
● Perform the measurement using external weight compensation.
● Perform the measurement without external weight compensation, e.g. by safely and
318
reliably clamping/locking the drive.
CNC Commissioning: NC, PLC, Drive
Commissioning Manual, 12/2019, A5E48312804B AA