Siemens Sinumerik 840D sl Diagnostic Manual page 370

Overview of Alarms
NCK alarms
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 MD36200 $MA_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 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.
- Check the speed setpoint cable (bus cable).
- Check the actual values and direction of position control.
- Change the position control direction if the axis rotates uncontrollably -> axis-specific MD32110
$MA_ENC_FEEDBACK_POL [n] = < -1, 0, 1 >.
- Increase the monitoring limit value in MD 36200 $MA_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.
(Internal test criterion activated by MD36690 $MA_AXIS_DIAGNOSIS, bit0)
Reaction: 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 MD36040 $MA_STANDSTILL_DELAY_TIME after interpola-
tion has ended. A constant check is made to determine whether the axis remains within the tolerance
range given in MD36030 $MA_STANDSTILL_POS_TOL.
The following cases are possible:
1. The NC/PLC interface signal DB31, ... DBX2.1 (Servo enable) is zero because the axis has jammed
mechanically. Due to mechanical influences (e.g. high machining pressure), the axis is pushed out-
side the permissible position tolerance.
2. With closed position control loop (without jamming) - NC/PLC interface signal DB31, ... DBX2.1
(Servo enable) is "1" - the axis is pushed away from its position by mechanical forces with a small gain
in the position control loop.
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.
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SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
© Siemens AG, 2009. All Rights Reserved
03/2009