Siemens Sinumerik 840D sl Diagnostic Manual page 372

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 by the axis-specific MD36210
$MA_CTRLOUT_LIMIT. The input value of 100% corresponds to the rated speed of the motor and
hence the rapid traverse velocity (exemplary default value: 840D=110%).
For SINAMICS: Drive parameter p1082 also has a limiting effect.
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 MD36220 $MA_CTRLOUT_LIMIT_TIME. The setpoint is limited during
this time to the maximum value that has been set in (MD36210 $MA_CTRLOUT_LIMIT).
The alarm can be reprogrammed in the MD11412 $MN_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. This alarm should not occur if the drive
controller has been set correctly and the machining conditions are those that normally prevail.
- Check actual values: Local sluggishness of the carriage, speed dip by torque surge 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 SIMO-
DRIVE 611D drives)?
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 with analog drives!
The permissible maximum value of drift (internal, integrated drift value of automatic drift compensa-
tion) was exceeded during the last compensation operation. The permissible maximum value is
defined in the axis-specific MD36710 $MA_DRIFT_LIMIT. The drift value itself is not limited.
Automatic drift compensation: MD36700 $MA_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 automatically compensated to zero by slowly integrating
an internal drift value.
Drift compensation by hand: MD36700 $MA_DRIFT_ENABLE=0
A static offset can be added to the speed setpoint in the MD36720 $MA_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 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 MD36020 $MA_POSITIONING_TIME.
Exact stop coarse: MD36000 $MA_STOP_LIMIT_COARSE
Exact stop fine: MD36010 $MA_STOP_LIMIT_FINE
The alarm can be reprogrammed in the MD11412 $MN_ALARM_REACTION_CHAN_NOREADY
(channel not ready).
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SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
© Siemens AG, 2009. All Rights Reserved
03/2009