Siemens SINUMERIK 808D ADVANCED Diagnostic Manual page 316

SINUMERIK 808D ADVANCED alarms
3.2 NCK alarms
A static offset can be added to the speed setpoint in the MD36720 $MA_DRIFT_VALUE. This is not included in the
drift monitoring because it acts like a voltage work offset.
Reaction: Alarm display.
Remedy: Please inform the authorized personnel/service department. Adjust the drift compensation with the automatic drift
compensation switched off at the drive until the position lag is approximately zero. Then reactivate the automatic drift
compensation in order to balance out the dynamic drift changes (effects of heating up).
Program Clear alarm with the Delete key or NC START.
Continuation:
25080 Axis %1 positioning monitoring
Parameters: %1 = Axis name, spindle number
Definitions: For blocks in which "exact stop" is effective, the axis must have reached the exact stop window after the positioning
time given in the axis-specific MD36020 $MA_POSITIONING_TIME.
Exact stop coarse: MD36000 $MA_STOP_LIMIT_COARSE
Exact stop fine: MD36010 $MA_STOP_LIMIT_FINE
The alarm can be reprogrammed in the MD11412 $MN_ALARM_REACTION_CHAN_NOREADY (channel not ready).
Reaction: Mode group not ready.
The NC switches to follow-up mode.
Channel not ready.
NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Channel not ready.
Remedy: Please inform the authorized personnel/service department. Check whether the exact stop limits (coarse and fine)
correspond to the dynamic possibilities of the axis, otherwise increase them, if necessary in connection with the
positioning time set in MD36020 $MA_POSITIONING_TIME.
Check speed controller/position controller optimization; select highest possible gain.
Check setting of Kv factor (MD32200 $MA_POSCTRL_GAIN) and increase, if required.
Program Restart part program.Clear alarm with the RESET key in all channels of this mode group. Restart part program.
Continuation:
25100 Axis %1 measuring system switchover not possible
Parameters: %1 = Axis name, spindle number
Definitions: The prerequisites are not satisfied for the required encoder switchover:
1. The newly selected encoder must be in the active state: (DB380x DBX1.5 / 1.6 = 1 (Position measuring system 1/2).
2. The actual value difference between the two encoders is greater than the value in the axis-specific MD36500
$MA_ENC_CHANGE_TOL ("Maximum tolerance for position actual value switchover").
Activation of the measuring system concerned takes place in accordance with the NC/PLC interface signals DB380x
DBX1.5 (Position measuring system 1) and DB380x DBX1.6 (Position measuring system 2), i.e. the position control
is now operated with this measuring system. The other measuring system is switched over to follow-up mode. If both
interface signals are set to "1", then only the 1st measuring system is active; if both interface signals are set to "0", the
axis is parked.
Changeover takes place as soon as the interface signals have changed, even if the axis is in motion.
Reaction: NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Please inform the authorized personnel/service department. When referencing the active position actual value
encoder, the actual value system of the inactive encoder is set to the same reference point value as soon as phase 3
has been concluded. A later positional difference between the two actual value systems can have occurred only as
the result of an encoder defect or a mechanical displacement between the encoders.
- Check the encoder signals, actual value cable, connectors.
- Check the mechanical fastenings (displacement of the measuring head, mechanical twisting possible).
- Increase the axis-specific MD 36500 $MA_ENC_CHANGE_TOL.
Program continuation is not possible. The program must be canceled with "RESET", then program execution can be
reinitiated with NC START, if necessary at the interruption point after "Block search with/without calculation".
Program Clear alarm with the RESET key. Restart part program
Continuation:
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Diagnostics Manual, 08/2013, 6FC5398-6DP10-0BA1
Diagnostics Manual