Siemens Sinumerik 840D sl Diagnostic Manual page 368

Overview of Alarms
NCK alarms
Remedy: Please inform the authorized personnel/service department. Check the measuring system in accor-
dance 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).
Program Con- Clear alarm with the RESET key in all channels of this mode group. Restart part program.
tinuation:
25011 Axis %1 pollution of passive encoder
Parameters: %1 = Axis name, spindle number
Definitions: 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.
MD36310 $MA_ENC_ZERO_MONITORING >100 returns the existing Cancel alarm instead of the
Reset alarm 25001.
Reaction: Alarm display.
Remedy: Please inform the authorized personnel/service department. Check the measuring system in accor-
dance 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).
Program Con- Clear alarm with the Delete key or NC START.
tinuation:
25020 Axis %1 zero mark monitoring of active encoder
Parameters: %1 = Axis name, spindle number
Definitions: For PROFIdrive:
The position encoder pulses between 2 zero mark pulses are counted, and the plausibility is assessed
(The functionality and possibly the parameteritation 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 (chan-
nel 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 there-
fore 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.
Monitoring can be switched off by setting MD36310 $MA_ENC_ZERO_MONITORING [n] to 0 or 100
(n = encoder number: 1, 2).
Program Con- Clear alarm with the RESET key in all channels of this mode group. Restart part program.
tinuation:
25021 Axis %1 zero mark monitoring of passive encoder
Parameters: %1 = Axis name, spindle number
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SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
© Siemens AG, 2009. All Rights Reserved
03/2009