Service Manual TNC 407 / TNC 415 - heidenhain - DR. JOHANNES ...

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- DR JOHANNES HEIDENHAIN GrnbH
Kundendienst
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8.7 Buffer Battery
Exchange Buffer Battery
The buffer battery is the voltage source for the
program memory, if the machine tool is switched off.
If the error message
EXCHANGE BUFFER BAlTERY
appears, the batteries must be exchanged within one
week.
The buffer batteries are located behind a screw
fitting in the power supply of the LE 407/LE 415.
To exchange, open the LE by undoing both snaps
In order to protect the program memory of the
TNC 407, a capacitor (located on the processor board)
is used in addition to the batteries. Thus, the line
voltage may be switched off during battery exchange,
Without the batteries the capacitor is capable of
maintaining the memory contents for about one day.
The TNC contains an additional accumulator so that
without the batteries the memory contents remains
stored for approx. two weeks.
NOTE:
The capacitor and the accumulator are only being
charged when the TNC is switched on (charging
time of the accumulator: approx. 24 hi.
SERVICE MANUAL TNC 407/415
Issue: 01.09.1995
Page 42
3 AA-size batteries,
leak-proof
IEC designation “LR6”
Processor Board TNC 407 Processor Board TNC 415