Siemens SINUMERIK 840D Series Diagnostics Manual page 326

1 Alarms
Remedy:
Program Continuation:
25100
Parameters:
Definitions:
Reactions:
Remedy:
Program Continuation:
25105
Parameters:
Definitions:
1-326
Please inform the authorized personnel/service department. Check whether the exact
stop limits (course and fine) correspond to the dynamic possibilities of the axis, otherwise
increase them, if necessary in connection with the positioning time set in MD 36020
POSITIONING_TIME. Check speed controller/position controller optimization; select
highest possible gains. Check setting of Kv factor (MD 32200 POSCTRL_GAIN) and
increase if necessary.
Clear alarm with the RESET key in all channels of this mode group. Restart part program.
Axis %1 measuring system switchover not possible
%1 = Axis name, spindle number
The prerequisites are not satisfied for the required encoder switchover:
1. The newly selected encoder must be in the active state (DB 31 - 48, DBX 1.5 or 1.6 = 1
"Position measuring system 1/2")
2. The actual value difference between the two encoders is greater than the value in the
axis-specific MD 36500 ENC_CHANGE_TOL ("Maximum tolerance for position actual
value switchover").
Activation of the measuring system concerned takes place in accordance with the inter-
face signals: "Position measuring system 1" (DB 31 - 48, DBX 1.5) and "Position measur-
ing system 2" (DB 31 - 48, DBX 1.6), 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!
- 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)
- NC Stop on alarm.
- NC Start disable in this channel.
- Alarm display.
- Interface signals are set.
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 dif-
ference between the 2 actual value systems can have occurred only as the result of an
encoded defect or a mechanical displacement between the encoders.
• Check the encoder signals, actual value cable, connectors.
• Check the mechanical fastenings (displacement of the measuring head, mechanical
twisting possible).
• Increase the axis-specific MD 36500 ENC_CHANGE_TOL.
Program continuation is not possible. The program must be aborted with "Reset", then
program execution can be reinitiated with NC Start, if necessary at the interruption point
after "Block search with/without calculation".
Clear alarm with the RESET key. Restart part program
Axis %1 measuring systems differ considerably
%1 = Axis name, spindle number
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 $MA_ENC_DIFF_TOL. This can only occur when both
measuring systems are active ($MA_NUM_ENCS = 2) and referenced. The alarm can be
reprogrammed in the MD ALARM_REACTION_CHAN_NOREADY (channel not ready).
SINUMERIK 840D/840Di/810D Diagnostics Guide (DA) – 11.02 Edition
 Siemens AG, 2002. All rights reserved
11.02