Siemens SINUMERIK 808D ADVANCED Diagnostic Manual page 339

25011 Axis %1 pollution of passive encoder
Parameters: %1 = Axis name, spindle number
Explanation: The encoder not used for position control sends a contamination signal (only in measuring systems with contamination
signal).
For PROFIdrive only:
MD36310 $MA_ENC_ZERO_MONITORING >100 returns the existing Reset alarm instead of the Power-on alarm 25001.
Reaction: Alarm display.
Remedy: Please inform the authorized personnel/service department. Check the measuring system in accordance with the
instructions given by the measuring device manufacturer.
Monitoring can be switched off by setting MD36310 $MA_ENC_ZERO_MONITORING[n] to 100 (n = encoder number:
1,2).
Programm Clear alarm with the RESET key. Restart part program
continuation:
25020 Axis %1 zero mark monitoring of active encoder
Parameters: %1 = Axis name, spindle number
Explanation: For PROFIdrive:
The position encoder pulses between 2 zero mark pulses are counted, and the plausibility is assessed (The functionality
and possibly the parameterization of the plausibility check is done on the drive side. Please refer to the relevant drive
documentation for details.), and reported in a PROFIdrive message frame (encoder interface) to the control, which then
issues the present alarm.
The alarm can be reprogrammed in 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.
Axes of this channel must be re-referenced.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Channel not ready.
Remedy: Please inform the authorized personnel/service department.
The differences can result from transmission errors, disturbances, encoder hardware faults or from the evaluation
electronics in the encoder used for position control. The actual value branch must therefore be checked:
1. Transmission path: Check the actual-value connectors for correct contacting, encoder cable for continuity, and also
check for short-circuits and grounding (loose contact?).
2. Encoder pulses: Is the encoder power supply within the tolerance limits?
3. Evaluation electronics: Replace or reconfigure the drive or encoder module used.
4. Check MD34220 $MA_ENC_ABS_TURNS_MODULO and Sinamics drive parameter P0979 subindex 5 (or 15,25). They
have to be the same for correct handling of the encoder data.
Monitoring can be switched off by setting MD36310 $MA_ENC_ZERO_MONITORING [n] to 0 or 100 (n = encoder number:
1, 2).
Programm Restart part program.
continuation:
25021 Axis %1 zero mark monitoring of passive encoder
Parameters: %1 = Axis name, spindle number
Explanation: Monitoring relates to the encoder that is not used by the position control. (NC-PLC interface signal DB380x DBX1.5 = 0
(Position measuring system 1) or DB380x DBX1.6 = 0 (Position measuring system 2))
More detailed explanations are similar to those for alarm 25020.
Reaction: Alarm display.
Diagnostics Manual
Diagnostics Manual, 06/2015, 6FC5398-6DP10-0BA2
Clear alarm with the RESET key in all channels of this mode group. Restart part program.
SINUMERIK 808D ADVANCED alarms
5.2 NCK alarms
339