Siemens SINUMERIK 840D Series Diagnostics Manual page 469

11.02
Program Continuation:
300100
Definitions:
Reactions:
Remedy:
Program Continuation:
300101
Definitions:
Reactions:
Remedy:
Program Continuation:
 Siemens AG, 2002. All rights reserved
SINUMERIK 840D/840Di/810D Diagnostics Guide (DA) – 11.02 Edition
• MD30220 $MA_ENC_MODULE_NR
• MD30240 $MA_ENC_TYPE
• MD11342 $MA_ENC_HANDWHEEL_MODULE_NR
Switch control OFF - ON.
Drive power failure
In one or several (all) drive modules, there is a power failure although power was previ-
ously available. (The timeout is checked for write/read accesses. Timeouts are interpreted
as power failure because this is the most probable case. The test takes place in the cyclic
mode only but not at system power-up.)
Since the drives in the SINUMERIK 840D and the NC-CPU have the same power supply,
this error does not occur here because then the NCU is also without power supply. In the
SINUMERIK FM-NC, this error can arise because the power supply is separate.
- NC not ready.
- Channel not ready.
- NC Stop on alarm.
- NC Start disable in this channel.
- The NC switches to follow-up mode.
- Alarm display.
- Interface signals are set.
Switch off the power to the system and switch on again - the drives start up again.
Clear alarm with the RESET key in all channels. Restart part program.
Bus communications failure
This alarm indicates that there is still no power supply to the drives although the NC is
already running. This message comes only if no drive module has been signaled. (In the-
ory, it could also be a bus error interrupting the connection to the 1st module).
- NC not ready.
- Channel not ready.
- NC Stop on alarm.
- NC Start disable in this channel.
- The NC switches to follow-up mode.
- Alarm display.
- Interface signals are set.
1) If the NCU has its own power supply, then the drives still have no power.
- If possible, switch on the power supply for the drives at the same time as the NCU.
2) If the NCU and the drives have the same power supply then not even the first module
could be recognized. Check whether the red LED on the first drive module is illuminated.
If this is not the case, then usually the module does not have any power.
- Check the connections of the ribbon cable running from your I/RF or monitoring unit to
the module.
- If after switching on the I/RF or monitoring unit, no LED of a module which is connected
to it is illuminated, then check the I/RF or monitoring unit and, if required, replace the rib-
bon cable.
3) Check whether all drive bus connectors have correctly snapped into place and that the
bus terminator is connected.
4) If you have not been able to detect an error by now, the module is defective.
- Replace the module.
Clear alarm with the RESET key in all channels. Restart part program.
1 Alarms
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