Siemens SINUMERIK 840D sl Series Diagnostics Manual page 374

Overview of Alarms
Only display of this alarm, since the absolute position itself is not required at this time for
control/contour.
Frequent occurring of this alarm indicates that absolute encoder transfer or the absolute
encoder itself are faulty and that the absolute value determined with the next encoder
selection or Power On situation could possibly be wrong.
Reactions: - Alarm display.
Remedy: Replace the encoder, replace or screen the encoder cable (or deactivate zero mark mon-
itoring).
Program Con- Clear alarm with the Delete key or NC START.
tinuation:
25030
Axis %1 actual velocity alarm limit
Parameters: %1 = Axis name, spindle number
Definitions: If the axis has at least one active encoder, then the actual speed of the axis is cyclically
checked in the IPO cycle. If there are no errors, the actual velocity can never become
greater than specified in the axis-specific MD 36200 AX_VELO_LIMIT (threshold for
velocity monitoring). This threshold value in [mm/min, rev/min] is input by an amount that
is about 5 to 10% greater than that which can occur at maximum traversing velocity. Drive
errors can result in the velocity being exceeded and the alarm is then triggered.
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 the speed setpoint
cable (bus cable). Check the actual values and direction of position control. Change posi-
tion control direction if the axis rotates uncontrollably -> axis-specific MD 32110
ENC_FEEDBACK_POL [n] = < -1, 0, 1 >. Increase the monitoring limit value in MD 36200
AX_VELO_LIMIT.
Program Con- Clear alarm with the RESET key in all channels of this mode group. Restart part program.
tinuation:
25031
Axis %1 actual velocity warning limit
Parameters: %1 = Axis name, spindle number
Definitions: The present velocity actual value is more than 80% of the limit value defined in the
machine data -- not used --
Reactions: - Alarm display.
Remedy: -
Program Con- Clear alarm with the Delete key or NC START.
tinuation:
25040
Axis %1 standstill monitoring
Parameters: %1 = Axis name, spindle number
Definitions: The NC monitors to ensure that the position is held at zero speed. Monitoring is started
after a time that can be set for a specific axis in the machine data 36040
STSTILL_DELAY_TIME after interpolation has ended. A constant check is made to deter-
mine whether the axis remains within the tolerance range given in MD 36030
STSTILL_POS_TOL.
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SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
© Siemens AG, 2005. All rights reserved
08/2005