Siemens SINUMERIK 840Di Diagnostic Manual page 416

Overview of Alarms
NCK alarms
25060 Axis %1 speed setpoint limitation
Parameters: %1 = Axis name, spindle number
Definitions: The speed setpoint has exceeded its upper limit for a longer period than allowed.
The maximum speed setpoint is limited to a certain percentage with the axis-specific machine data
36210 CTRLOUT_LIMIT. The input value of 100% corresponds to the rated speed of the motor and
hence the rapid traverse velocity (default values: 840D=110%, FM-NC=100%).
If the values are exceeded for a short time, then this is tolerated provided they do not last longer than
allowed for in the axis-specific MD 36220 CTRLOUT_LIMIT_TIME. The setpoint is limited during this
time to the maximum value that has been set (MD 36210).
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. If the drive controller has been set
correctly and if the machining conditions are those that normally prevail, then this alarm should not
occur.
- Check actual values: Local tight running of the carriage, speed dip by torque reduction due to contact
with workpiece/tool, travel against fixed obstacle, etc.
- Check direction of position control: Does the axis continue to rotate without control (not on 611D
drives)?
- Check the speed setpoint cable.
Program Clear alarm with the RESET key in all channels of this mode group. Restart part program.
Continuation:
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 permissible
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.
Reaction: 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 Clear alarm with the Delete key or NC START.
Continuation:
2-416
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
11/2006