Speed
control loop
09.95
Siemens AG 2001 All Rights Reserved 6FC5197–jAA50 9–15
SINUMERIK 840C (IA)
9.2.3 Speed control loop (axis and spindle – as from SW 3)
You can select the measuring function for the speed control loop with this softkey.
Notes Test measurements on the speed control loop (axis and spindle) can be perfor-
med on both analog and digital drives.
Applic. to analog: The speed is sensed by the same
measuring system with which the
position control (SERVO) operates.
Applic. to digital: The motor speed is always measured.
The spindle measuring system (spindle encoder) must be defined or declared
(NC-MD 5200.2) for the spindle.
Explanation Different types of measurement are available for testing the speed control loop:
Reference frequency response
Interference frequency response (up to SW 4.4)
Mechanical frequency response nact/Iqact (as from SW 5)
Setpoint step change
Disturbance step change
The actual speed value of the active measuring system is the measured quantity.
The enable commands must be implemented internally or with PLC or with PLC
without NC (as from SW 4).
The following applies to the upper and lower traversing range limits:
The specified limit values define the permissible traversing range during start-up.
In the case of a referenced axis/positioned spindle, the limit refers to the
axis/spindle position at the start of the movement and, with a non-referenced
axis/non-positioned spindle, to the axis/spindle position at the start of the first
test movement after the machine is switched on.
Value 0.0 means no traversing limit, i.e. the traversing
range is not monitored.
The current axis/spindle position is displayed in the position actual value/absolute
position field.
9 Drive Servo Start-Up Application (as from SW 3)
9.2.3 Speed control loop (axis and spindle – as from SW 3)
07.97