5 – 56 HEIDENHAIN Service Manual iTNC 530
The message RELAY
EXTERNAL DC VOLTAGE
MISSING does not disappear,
although the key CONTROL
VOLTAGE ON is pressed.
EMERGENCY STOP chain
interrupted
24 V power supply
(connector) X34 missing
MC defective
Check output "Control is
ready" and
acknowledgment I3
See “Checking the
Enables on the iTNC 530”
on page 16 – 229.
When the machine is
switched on, the error
message "EMERGENCY STOP
defective"
Wiring defective,
contactors defective or
too slow
MC defective
Check the related
components
See “Error message:
EMERGENCY STOP
defective” on page 16 –
236.
iTNC monitor is "frozen".
The control has locked up.
The main switch has to be
switched off and on again.
After reset of the control
"Power fail Interrupt!" is
entered in the log of new
software versions.
Power failure
Failure of one or several
phases in the supply line
Supply voltage fallen
below minimum
Interruption in the
electrical cabinet
Inverter (power supply
module) defective
Short circuit of drives
(drive modules, motors)
Check the primary supply
(cables, fuses, terminals)
Check the wiring of the
inverter system, see
circuit diagrams of the
machine manufacturer.
Check the function of the
inverter system or the
motors.
See “Power Supply” on
page 17 – 251.
See "Service Manual for
Inverter Systems and
Motors".
During switch-on or
operation DSP errors are
generated. A mechanical
reason or a defective unit
can be ruled out.
Data loss on the hard disk
in the range of the SYS
partition
Check the hard disk.
Activate the NC software
again.
See “Test of Hard Disk”
on page 12 – 153.
See “Reloading the NC
Software Used” on page
14
– 209.
There are re
peated hard disk
errors.
Defects on the hard disk
Defective unit connected
to the control (short
circuit, etc.)
Check the hard disk.
Disconnect suspicious
units.
See “Test of Hard Disk”
on page 12 – 153.
See “Notes and Tips” on
page 6 – 72.
NC functions do not function
any more. (The control may
have reported that the
corresponding files have
been deleted.)
Data loss on the hard disk
in the range of the SYS
partition
Check the hard disk.
Activate the NC software
again.
See “Test of Hard Disk”
on page 12 – 153.
See “Reloading the NC
Software Used” on page
14 – 209.
Error messages regarding
encoders or other
connected units are
generated although you find
out that these do not cause
the errors!
Defective unit connected
to the control (short
circuit, etc.)
Probe or handwheel that
were exposed to humidity
(coolant, etc.) or have
been damaged --> Supply
voltages (5V, 12V, 15V)
are impaired. A variety of
error messages are
possible.
Disconnect defective or
suspicious units or cables.
See “Error Localization by
Process of Exclusion” on
page 6 – 66.
Various error messages are
generated which, however,
are not substantive.
Connection (short circuit)
of shielding potential
(chassis, cable shielding)
with 0V voltage potential
of the NC power supply.
Check the cables for
damage. Check the
machine for correct
shielding (ask the machine
manufacturer).
See “Notes and Tips” on
page 6 – 72.
The machine cannot be
referenced after switch-on,
or during operation neither
the axes can be moved nor
the spindle switched on.
Interruption between NC
Stop key and control (the
NC Stop signal is low-
active).
Eliminate the interruption,
repair the key element,
etc.
See “Machine Operating
Panel” on page 23 – 389.
Error Possible cause of error Measures for error
diagnosis and/or
corrective action
Descriptions in this
manual
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