Measurement Function - Siemens Sinumerik 840D Series Function Manual

04.00
10.03
3.11.1

Measurement function

Valve control loop
measurement
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
The measurement functions can be used to evaluate the most important speed
and position control loop variables in the time and frequency range on screen
without having to use external measuring devices.
An overview of the measurement functions provided for HLA is given below.
Only the hydraulic-specific functionality for HLA is described in detail.
The following measurement 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 measured variables for the 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 Valve control loop measurement parameter settings
Parameters
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 Startup
Measured quantities
Physical unit
V
Hz
-
ms
V
3-77