Siemens SINUMERIK 840Di Diagnostic Manual page 417

11/2006
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 MD 36020 POSITIONING_TIME.
Exact stop coarse: MD 36000 STOP_LIMIT_COARSE
Exact stop fine: MD 36010 STOP_LIMIT_FINE
The alarm can be reprogrammed in the MD 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
(course and fine) correspond to the dynamic possibilities of the axis, otherwise increase them, if
necessary in connection with the positioning time set in MD 36020 POSITIONING_TIME. Check
speed controller/position controller optimization; select highest possible gains. Check setting of Kv
factor (MD 32200 POSCTRL_GAIN) and increase if necessary.
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 (DB 31 - 48, DBX 1.5 or 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
MD 36500 ENC_CHANGE_TOL ("Maximum tolerance for position actual value switchover").
Activation of the measuring system concerned takes place in accordance with the interface signals:
"Position measuring system 1" (DB 31 - 48, DBX 1.5) and "Position measuring system 2" (DB 31 - 48,
DBX 1.6), 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 2 actual
value systems can have occurred only as the result of an encoded 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 ENC_CHANGE_TOL.
Program continuation is not possible. The program must be aborted 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:
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
Overview of Alarms
NCK alarms
2-417