Siemens SINUMERIK 840Di Diagnostic Manual page 358

Overview of Alarms
NCK alarms
20003 Channel %1 axis %2 measuring system error
Parameters: %1 = Channel number
%2 = Axis name, spindle number
Definitions: In a measuring system with distance-coded reference marks, the distance between two adjacent
markers has been found to be more than twice the distance entered in the machine data 34300
ENC_REFP_MARKER_DIST.
The control issues the alarm after having made a 2nd attempt in reverse direction with half the
traversing velocity and detecting that the distance is too large again.
Reaction: NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Determine the distance between 2 odd reference point markers (reference point marker interval). This
value (which is 20.00 mm on Heidenhain scales) must be entered in the machine data 34300
ENC_REFP_MARKER_DIST.
Check the reference point track of the scale including the electronics for the evaluation.
Program Clear alarm with the RESET key. Restart part program
Continuation:
20004 Channel %1 axis %2 reference mark missing
Parameters: %1 = Channel number
%2 = Axis name, spindle number
Definitions: In the distance-coded length measurement system 2 reference marks were not found within the
defined searching distance (axis-specific MD: 34060 REFP_MAX_MARKER_DIST).
No reduction cam is required for distance-coded scales (but an existing cam will be evaluated). The
conventional direction key determines the direction of search. The searching distance 34060
REFP_MAX_MARKER_DIST, within which the two reference point markers are expected is counted
commencing at the start point.
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. Determine the distance between 2 odd
reference point markers (reference point marker interval). This value (which is 20.00 mm on
Heidenhain scales) must be entered in the machine data 34060 REFP_MAX_MARKER_DIST.
Check the reference point track of the scale including the electronics for the evaluation.
Program Clear alarm with the RESET key. Restart part program
Continuation:
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© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
11/2006