Measurement Function - Siemens SINUMERIK 840D Description Of Functions

04.00
02.99
3.11.1

Measurement function

Valve control loop
measurement
 Siemens AG 2000. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
The measurement functions allow assessment of the most important variables
of the speed and position control loop in the time and frequency range without
the use of external measuring devices on the screen.
An Overview of the measurement functions provided for HLA is given below,
with only the purely hydraulic-specific functionality for HLA described in detail.
The following measuring functions can be performed in conjunction with the
HLA:
S
Valve control loop measurement
– Valve frequency response
S
Velocity control loop measurement
– Reference frequency response
– Setpoint step change
– Interference frequency response
– Disturbance step change
– Velocity path
– Velocity path + controller
S
Position control loop measurement
– Reference frequency response
– Setpoint step change
– Setpoint ramp
Table 3-2 Measurement types and quantities for valve control loop measurement
Measurement
Valve frequency Valve spool setpoint in velocity con-
response troller cycle, valve control loop closed,
velocity control loop open
Table 3-3 Parameterization of valve control loop measurement
Parameter
Amplitude
Bandwidth
Averaging operations
Settling time
Offset
Note
It must be ensured that the drive is adequately lubricated before PBRS/FFT is
applied (high-frequency movement at one position).
3.11 Start-up functions
Trigger
Actual valve spool value/
valve spool setpoint
typ 1 V
typ 1000 Hz
typ 10
typ 100
typ 0
3 Start-Up
Measured quantities
Physic. Unit
V
Hz
–
ms
V
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