The limit is to be selected so that the maximum velocity (rapid traverse) can be
reached, and an appropriate additional control margin is available.
36220 CTRLOUT_LIMIT_TIME EXP, A05 A3
s Delay time for speed setpoint monitoring DOUBLE NEW CONF
-
- 1 0.0 0.0 - 1/1 M
Description: This MD defines how long the speed setpoint may be within the limit CTRLOUT_LIMIT[n]
(max. speed setpoint) until the monitoring function is triggered.
Monitoring (and with it also this machine data) is always active.
Reaching the limit renders the position control loop non-linear, which results in
contour errors provided that the speed setpoint limited axis is participating in
contour generation. That is why this MD has default value 0, i.e. the monitoring
function responds as soon as the speed setpoint reaches the limit.
36300 ENC_FREQ_LIMIT EXP, A02, A05,
A06
A3, D1, R1, Z1
- Encoder limit frequency DOUBLE PowerOn
-
- 1 333000, 3.0e5 0.0 - 2/2 M
Description: This MD is used to enter the encoder frequency, which,
in general, is a manufacturer specification (type plate, documentation).
For PROFIdrive:
No automatic, software-internal limitation for encoders on the PROFIdrive drive; here,
the limit values of the measuring circuit module depend on the drive hardware used,
i.e.
known only
by the drive. Therefore, it is the user who is responsible for taking
into account the limit frequency of the measuring circuit module.
36302 ENC_FREQ_LIMIT_LOW EXP, A02, A05,
A06
A3, R1, S1, Z1
% Encoder limit frequency for new encoder synchronization. DOUBLE NEW CONF
-
- 1 99.9, 99.9 0 100 2/2 M
Description: Encoder frequency monitoring uses a hysteresis.
MD36300 $MA_ENC_FREQ_LIMIT defines the encoder limit frequency. The encoder is
switched off when this frequency is exceeded. The encoder is switched on again when
the frequency falls below that defined in MD36302 $MA_ENC_FREQ_LIMIT_LOW.
MD36300 $MA_ENC_FREQ_LIMITis entered directly in Hertz,
whereas MD36302 $MA_ENC_FREQ_LIMIT_LOW is a fraction, expressed as a percentage, of
MD36300 $MA_ENC_FREQ_LIMIT.
MD36302 $MA_ENC_FREQ_LIMIT_LOW is therefore already correctly preset for most of the
encoders used.
Exception: In the case of absolute encoders with an En-Dat interface, the limit
frequency
of the
absolute track is significantly lower than the limit frequency of the
incremental track. A low value in MD36302 $MA_ENC_FREQ_LIMIT_LOW ensures that the
encoder is not switched on again until it falls below the limit frequency of the
absolute track, and therefore is not referenced until permitted by the absolute track.
For spindles, this referencing is carried out automatically.
Example EnDat encoder EQN 1325:
Limit frequency of the electronics of the incremental track: 430 kHz
===> MD36300 $MA_ENC_FREQ_LIMIT = 430 kHz
The limit frequency of the absolute track is approx. 2000 encoder rpm at 2048
increments/encoder revolution, i.e. the limit frequency is 2000/60 * 2048 Hz = 68 kHz
Machine data
3.4 Axis-specific machine data
Parameter Manual
List Manual, 01/2017 303
To Next Page
Loading...
