3 – 674 HEIDENHAIN Service Manual iTNC 530
3.3.7 Temperature monitoring
Temperature of the
MC 42x (B/C)
The internal temperature of the MC 42x (B/C) is continuously monitored. At approx. 55 °C the
message TNC temperature warning is displayed. If the temperature does not fall below
55° C any more, the warning is reactivated after two minutes. Beginning at about 60 °C the error
message Temperature too high <temperature> °C appears and an EMERGENCY STOP is
triggered. If the temperature does not fall below 60 °C when the machine is switched on again,
the error message reappears after 10 to 20 seconds.
Motor temperature To measure the motor temperature, a KTY 84 must be connected at pins 13 and 25 of X15 to
X20, X80 to X83. The temperature value is ascertained at least once per second. The maximum
permissible motor temperature is taken from the motor table.
If this voltage is exceeded, it results in the error message
MOTOR TEMPERATURE <AXIS> TOO HIGH and the drives are automatically switched off.
Heat sink
temperature of the
power module
At X51 to X60 the temperature warning signal is available at pin 10a.
If the permissible temperature of the heat sink on the power module is exceeded, this signal is
reset.
The temperatur warning signal is not evaluated in the NC. This information is made available via
the modules 9610 or 9066.
Possible
causes of error
No claim for completeness; contact your machine manufacturer!
You may add your own experiences!
îš„ Device (motor, power module, etc) overloaded
îš„ Clogged filter pads
îš„ Climate control unit in electrical cabinet defective
îš„ Defective fan
îš„ Unfavorable mounting of components
îš„ Defective temperature sensor
îš„ Defective encoder cable
Entries in the motor table must not be changed!
To avoid destroying the power module, the drives must be brought to a standstill
immediately after a temperature warning.
The OEM should provide for correspondingly!
Data on maximum permissible temperatures are available from the manufacturer of your
power supply unit.
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