February 2012 5 – 51
5 Errors
5.1 Introduction
Not all error conditions on the control or machine can be shown by error messages on the monitor.
Therefore, this chapter gives you an overview of errors with notes and tips on how to proceed.
Permanent and
reproducible errors
An interruption in the electrical cabinet or a defective device are a permanent error.
If you can generate an error on a machine at any time, the error is reproducible.
By their very nature, permanent and reproducible errors can be located more easily.
Sporadic and non-
reproducible errors
Sporadic errors may, for example, be caused by a loose connection, shielding problems or
interference.
Non-reproducible errors cannot be generated reliably by certain actions. They "randomly" appear on the
machine.
The integrated log, the PLC logic diagram or the integrated oscilloscope can be used to investigate
sporadic, non-reproducible errors.
5.2 Overview of possible errors
The following table shows an overview of specific errors on the machine or control, possible causes
of the errors as well as measures for finding these errors.
The potential measures for finding and correcting the errors are described in more detail in the
corresponding chapters.
In case of errors that may lead to very high currents, e.g. ground fault or short circuit in the drive,
do not switch on the machine again!
First ensure that there are no defective units, cables, etc.
Then eliminate all ground faults and short circuits in the machine!
Where it is possible and useful, you may switch the control off and on (after several seconds)
to observe, whether the error is generated again.
Error Possible cause of error Measures for error
diagnosis and/or corrective
action
Descriptions in this manual
The iTNC monitor remains
dark after the machine has
been switched on.
iTNC monitor defective
Power supply to monitor
defective
Power supply to MC
defective
Defective unit connected to
the control (short circuit,
etc.)
Check the monitor
Check the power supply
to the MC
Disconnect defective or
suspicious units or cables
See ”Visual display unit” on
page 22 – 361.
See ”Power supply” on
page 18 – 243.
See ”Error localization by
process of exclusion” on
page 6 – 63.
The control does not boot
completely (error messages
related to the booting
procedure may be displayed).
Hard disk defective Exchange MC or HDR or
drive assembly
See ”Exchange of
HEIDENHAIN
components” on page 29 –
515.
The Power interrupted
message cannot be
confirmed.
Key is stuck Check the keyboard See ”Keyboard unit” on
page 23 – 365.
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