Siemens SINUMERIK 840D Series Diagnostics Manual page 323

11.02
25040
Parameters:
Definitions:
Reactions:
Remedy:
Program Continuation:
25042
Parameters:
Definitions:
Reactions:
Remedy:
Program Continuation:
 Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Diagnostics Guide (DA) – 11.02 Edition
Axis %1 standstill monitoring
%1 = Axis name, spindle number
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.
The following cases are possible:
1. The interface signal SERVO ENABLE (DB31 - 48, DBX 2.1) is zero because the axis
has jammed mechanically. Due to mechanical influences (e.g. high machining pressure),
the axis is pushed away from the permissible position tolerance.
2. With closed position control loop (without jamming) - interface signal SERVO ENABLE
(DB 31 - 48, DBX 2.1) 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 MD ALARM_REACTION_CHAN_NOREADY
(channel not ready).
- The NC switches to follow-up mode.
- Mode group not ready.
- Channel not ready.
- NC Start disable in this channel.
- Interface signals are set.
- Alarm display.
- NC Stop on alarm.
- Channel not ready.
- If the axis is a single axis when this alarm is triggered, the alarm is only effective for this
axis (not effective for e.g. the channel or mode group)
Please inform the authorized personnel/service department.
• Check MD 36040 STSTILL_DELAY_TIME and MD 36030 STSTILL_POS_TOL;
increase if necessary. The value must be greater than the machine data "Exact stop -
coarse" ($MA_STOP_LIMIT_COARSE).
• Estimate machining forces and reduce if necessary by setting a lower feed or a higher
rotational speed.
• Increase clamping pressure.
• Increase the gain in the position control loop by improved optimization (Kv factor MD
32200 POSCTRL_GAIN, 611D drive).
Clear alarm with the RESET key in all channels of this mode group. Restart part program.
Axis %1 standstill monitoring during torque/force limitation
%1 = Axis name, spindle number
The defined end position was not reached within the time specified in the machine data.
- Mode group not ready.
- Channel not ready.
- Channel not ready.
- NC Start disable in this channel.
- NC Stop on alarm.
- The NC switches to follow-up mode.
- Alarm display.
- Interface signals are set.
• If the drive torque (FXST) was set too low with the result that the force of the motor was
not sufficient to reach the end position -> increase FXST.
• If the machined part is slowly deformed, there may be a delay in reaching the end posi-
tion -> increase MD 36042 FOC_STANDSTILL_DELAY_TIME.
Clear alarm with the RESET key in all channels of this mode group. Restart part program.
1 Alarms
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