Siemens 611-D, 840C S S, S

Meas.

parameter

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SINUMERIK 840C (IA)

As from SW 6:

SThe offset is reached along an acceleration ramp.

SThe acceleration value is defined for an

axis: MD 276*: Acceleration

spindle: MD 419* –

MD 426*: Acceleration constant for 8 gear stages

SThe following applies: Acceleration value=0, no ramp

Acceleration value0, ramp active

SThe actual measuring function is not activated until the offset value is re-

ached.

SBandwidth

Setting of frequency range to be analyzed (must not exceed a value corres-

ponding to half the speed controller sampling frequency). The lower this va-

lue, the finer the frequency resolution will be and the longer the measurement

time.

max.band width fsampl.

21

2xt

sampl.

e.g. 4 kHz with 1 or 2 drive modules (for 125 ms speed controller sampling

time)

SAveraging operations

The higher this value is set, the more accurate the measurement and the lon-

ger the measurement time. You should normally enter a value of 20.

SSettling time

This value represents the delay between the start of measured data recording

and injection of the test signal and offset. A settling time of more than zero

(0.1–2 s) should be entered for frequency response measurements in order to

take measurements under steady-state conditions – interference in the

amplitude and phase response may otherwise occur as a result of transient

behaviour.

D2nd measurement type: Interference frequency response (up to SW 4.4) Mechanical

frequency response nact/Iqact (as from SW 5)

To evaluate the noise suppressions by the control (only 611 D–FDD), the interfe-

rence frequency response can be entered. With SW4, this measurement can also

be performed for 611 D_MSD.

You can select the menu Meas. parameters for measuring the speed control loop

with this softkey.

Note You enter the measurement parameters in the selected display. These parame-

ters are managed internally as configuration data rather than machine data, i.e.

they are not initialized when the machine runs up. Data can be input in two diffe-

rent ways:

SManual input

SInput by loading of an existing, complete data set with the aid of file functions

Measurement as for measurement type reference frequency response

parameter setting

(see Section on Signal

waveforms of the

function generator)

9 Drive Servo Start-Up Application (as from SW 3)

9.2.4 Speed control loop (axis and spindle) – measurement parameters (4 basic settings – as from SW 3)

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