Siemens SINUMERIK 840Di Diagnostic Manual page 414

Overview of Alarms
NCK alarms
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 --
Reaction: Alarm display.
Remedy: -
Program Clear alarm with the Delete key or NC START.
Continuation:
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 determine 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).
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 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).
Program Clear alarm with the RESET key in all channels of this mode group. Restart part program.
Continuation:
2-414
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
11/2006