5 buffer battery – HEIDENHAIN TNC 415 (259 9x0) Service Manual User Manual
Page 66
SERVICE MANUAL TNC 415B/425
Page 61.1
Issue: 20.08.95
10.5 Buffer Battery
The buffer battery is the voltage source for the program
memory when the machine tool is switched off.
If the error message
EXCHANGE BUFFER BATTERY
is generated, the batteries must be exchanged within
one week.
The buffer batteries are located behind a screw fitting in the
power supply of the LE. To exchange the batteries, open
the LE by undoing the snaps.
In order to protect the program memory of TNC 415B/425,
a capacitor (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 capacitor is only being charged when the TNC
is switched on.
3 AA-size batteries
leak-proof
IEC designation "LR6"