Siemens SINUMERIK 840D sl Series Diagnostics Manual page 377

08/2005
Program Con- Clear alarm with the RESET key in all channels of this mode group. Restart part program.
tinuation:
25070
Axis %1 drift value too large
Parameters: %1 = Axis name, spindle number
Definitions: Only in FM-NC with analog drives!
The permissible maximum value of drift (internal, integrated drift value of automatic drift
compensation) has been exceeded during the last compensation operation. The permissi-
ble maximum value is defined in the axis-specific machine data 36710 DRIFT_LIMIT. The
drift value itself is not limited.
Automatic drift compensation: MD 36700 DRIFT_ENABLE=1
The difference between actual and setpoint position (drift) is checked cyclically in the IPO
cycle when the axes are at zero speed. The difference is compensated automatically to
zero by slowly integrating an internal drift value.
Drift compensation by hand: MD 36700 DRIFT_ENABLE=0
A static offset can be added to the speed setpoint in the machine data 36720
DRIFT_VALUE. This is not included in the drift monitoring because it acts like a voltage
zero offset.
Reactions: - Alarm display.
Remedy: Please inform the authorized personnel/service department. Adjust the drift compensation
with the automatic drift compensation switched off at the drive until the position lag is
approximately zero. Then reactivate the automatic drift compensation in order to balance
out the dynamic drift changes (effects of heating up).
Program Con- Clear alarm with the Delete key or NC START.
tinuation:
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).
Reactions: - 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 Con- Clear alarm with the RESET key in all channels of this mode group. Restart part program.
tinuation:
25100
Axis %1 measuring system switchover not possible
© Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
Overview of Alarms
2-377