Siemens Sinumerik 840D sl Diagnostic Manual page 373

03/2009
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 whether the exact stop limits
(coarse and fine) correspond to the dynamic possibilities of the axis, otherwise increase them, if nec-
essary in connection with the positioning time set in MD36020 $MA_POSITIONING_TIME.
Check speed controller/position controller optimization; select highest possible gain.
Check setting of Kv factor (MD32200 $MA_POSCTRL_GAIN) and increase, if required.
Program Con- Clear alarm with the RESET key in all channels of this mode group. Restart part program.
tinuation:
25100 Axis %1 measuring system switchover not possible
Parameters: %1 = Axis name, spindle number
Definitions: The prerequisites are not satisfied for the required encoder switchover:
1. The newly selected encoder must be in the active state: (DB31, ... DBX1.5 / 1.6 = 1 (Position mea-
suring system 1/2).
2. The actual value difference between the two encoders is greater than the value in the axis-specific
MD36500 $MA_ENC_CHANGE_TOL ("Maximum tolerance for position actual value switchover").
Activation of the measuring system concerned takes place in accordance with the NC/PLC interface
signals DB31, ... DBX1.5 (Position measuring system 1) and DB31, ... DBX1.6 (Position measuring
system 2), i.e. the position control is now operated with this measuring system. The other measuring
system is switched over to follow-up mode. If both interface signals are set to "1", then only the 1st
measuring system is active; if both interface signals are set to "0", the axis is parked.
Changeover takes place as soon as the interface signals have changed, even if the axis is in motion.
Reaction: NC Start disable in this channel.
Interface signals are set.
Alarm display.
NC Stop on alarm.
Remedy: Please inform the authorized personnel/service department. When referencing the active position
actual value encoder, the actual value system of the inactive encoder is set to the same reference
point value as soon as phase 3 has been concluded. A later positional difference between the two
actual value systems can have occurred only as the result of an encoder defect or a mechanical dis-
placement between the encoders.
- Check the encoder signals, actual value cable, connectors.
- Check the mechanical fastenings (displacement of the measuring head, mechanical twisting possi-
ble).
- Increase the axis-specific MD 36500 $MA_ENC_CHANGE_TOL.
Program continuation is not possible. The program must be aborted with "RESET", then program exe-
cution can be reinitiated with NC START, if necessary at the interruption point after "Block search
with/without calculation".
Program Con- Clear alarm with the RESET key. Restart part program
tinuation:
25105 Axis %1 measuring systems differ considerably
Parameters: %1 = Axis name, spindle number
Definitions: The two measuring systems differ considerably, i.e. the cyclically monitored actual value difference
between the two measuring systems is greater than the associated tolerance value set in the machine
data MD36510 $MA_ENC_DIFF_TOL. This can only occur when both measuring systems are active
(MD30200 $MA_NUM_ENCS = 2) and referenced. The alarm can be reprogrammed in the MD11412
$MN_ALARM_REACTION_CHAN_NOREADY (channel not ready).
© Siemens AG, 2009. All Rights Reserved
SINUMERIK 840D sl, 840Di sl, SINAMICS, Diagnostics Manual (DAsl), 03/2009
Overview of Alarms
NCK alarms
2-373