Siemens SINUMERIK 840Di Diagnostic Manual page 357

11/2006
20001 Channel %1 axis %2 no cam signal present
Parameters: %1 = Channel number
%2 = Axis name, spindle number
Definitions: At the beginning of phase 2 of reference point approach, the signal from the reduction cam is no longer
available.
Phase 2 of reference point approach begins when the axis remains stationary after deceleration to the
reduction cam. The axis then starts in the opposite direction in order to select the next zero marker of
the measuring system on leaving the reduction cam or approaching it again (negative/positive edge).
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. Check whether the deceleration path
after the approach velocity is greater than the distance to reference point cam - in which case the axis
cannot stop until it is beyond the cam. Use longer cam or reduce the approach velocity in machine
data 34020 REFP_VELO_SEARCH_CAM.
When the axis has stopped at the cam, it must be checked whether the signal "DECELERATION
REFERENCE POINT APPROACH" is still available at the interface to the NCK (DB 31 - 48, DBX
12.7).
- Hardware: Wire break? Short circuit?
- Software: User program?
Program Clear alarm with the RESET key. Restart part program
Continuation:
20002 Channel %1 axis %2 zero mark not found
Parameters: %1 = Channel number
%2 = Axis name, spindle number
Definitions: The zero marker of the incremental encoder is not within a defined section.
Phase 2 of reference point approach ends when the zero marker of the encoder has been detected
after the rising/falling edge of the PLC interface signal "DECELERATION REFERENCE POINT
APPROACH" (DB 31 - 48, DBX 12.7) has given the trigger start. The maximum distance between the
trigger start and the zero marker that follows is defined in the machine data 34060
REFP_MAX_MARKER_DIST.
The monitor prevents a zero marker signal from being overtraveled and the next being evaluated as
reference point signal. (Faulty cam adjustment or excessive delay by the PLC user program).
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. Check the cam adjustment and make
sure that the distance is sufficient between the end of the cam and the zero marker signal that follows.
The path must be greater than the axis can cover in the PLC cycle time.
Increase the machine data 34060 REFP_MAX_MARKER_DIST, but do not select a value greater
than the distance between the 2 zero markers. This might result in the monitor being switched off.
Program Clear alarm with the RESET key. Restart part program
Continuation:
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
Overview of Alarms
NCK alarms
2-357