Siemens SINUMERIK 840D sl Series Diagnostics Manual page 375

08/2005
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).
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 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 Con- Clear alarm with the RESET key in all channels of this mode group. Restart part program.
tinuation:
25042
Axis %1 standstill monitoring during torque/force limitation
Parameters: %1 = Axis name, spindle number
Definitions: The defined end position was not reached within the time specified in the machine data.
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: • 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.
Program Con- Clear alarm with the RESET key in all channels of this mode group. Restart part program.
tinuation:
25050
Axis %1 contour monitoring
Parameters: %1 = Axis name, spindle number
Definitions: The NCK calculates for each interpolation point (setpoint) of an axis the actual value that
should result based on an internal model. If this calculated actual value and the true
© Siemens AG, 2005. All rights reserved
SINUMERIK 840D sl/840D/840Di/810D Diagnostics Guide (DA), 08/2005 Edition
Overview of Alarms
2-375