Siemens Sinumerik 840DiE sl - Speed Control Loop Measurement

01/2007
14.4 Frequency response measurements
14-434
© Siemens AG 2007 All Rights Reserved
SINUMERIK 840Di sl Manual (HBIsl) – 01/2007 Edition
14.4.2 Speed control loop measurement
The response characteristics for the motor measuring system are analyzed
when measuring the speed control loop. Various measurement parameter lists
are available depending on the basic measurement setting which has been se-
lected.
Operating path for measuring the speed control loop: Operating area switch-
over > Commissioning > Optimization/test > Speed control loop
The following measurement functions are available for measuring the speed
control loop:
Measuring type Measured variable
Reference frequency response
(downstream
of the speed setpoint
filter)
Speed actual value motor encoder/speed setpoint
after filter
Reference frequency response
(upstream
of the speed setpoint fil-
ter)
Speed actual value motor encoder/speed setpoint
after filter
Setpoint step change
(downstream of the speed setpoint
filter)
Measured variable 1:
– Speed setpoint after filter
– Torque actual value
Measured variable 2: Speed actual value motor
encoder
Interference frequency response
(fault downstream of the current set-
point filter)
Speed actual value motor encoder/torque setpoint
value fct. generator
Disturbance variable step change
(fault downstream of the current set-
point filter)
Measured variable 1:
– Torque setpoint value fct. generator
– Torque actual value
Measured variable 2: Speed actual value motor
encoder
Speed–controlled system
(excitation downstream of the cur-
rent setpoint filter)
Speed actual value motor encoder/torque actual
value
Frequency response of the mechani-
cal parts
1)
Speed actual value measuring system 1/speed
actual value measuring system 2
1) The machine axis in question must have both a direct and an indirect measuring
system to determine the frequency response of the mechanical parts.
The measurement sequence is divided into the following steps:
1. Setting the traverse range monitoring and the enable logic.
2. Selecting the measuring type and measured variable
3. Setting the parameters, softkey ”Measuring parameters”
4. Displaying the measurement results, softkey ”Display”
The reference frequency response measurement determines the transmission
ratio of the speed controller.
The response range should be as wide as possible and without resonance. It
may be necessary to use bandstop or low–pass filters. Particular care must be
taken to prevent resonance within the speed controller limit frequency range
(stability limit approx. 200–500 Hz).
Functionality
Operating path
Measuring
functions
Measurement
Measurement:
Reference and
interference
frequency
response
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