February 2012 18 – 257
18.6 Buffer battery
Introduction The buffer battery ...
is the power source for the RAM when the machine is switched off.
is mounted inside the MC 62xx.
has a rated voltage of 3 V.
has a typical service life of three to five years.
For safeguarding the RAM data during battery exchange, a special capacitor ("Gold cap") was
integrated onto the PCB of MC 62xx. This capacitor stores the RAM content for approx. one day
without battery.
The following information is stored in the battery-buffered memory:
Non-volatile PLC operands
Most recent log entries
Information about the trace function
Information about program interruption
Information from absolute encoders with EnDat interface
Information about the boot process
Information about errors
Message
Figure: "Replace buffer battery" message after power-on
Checking the
charge status of
the "Gold cap"
Before you replace the buffer battery, the charge status of the Gold cap should be checked:
8 Enter the code number 79513. --> See ”Information menu” on page 18 – 261.
8 Read the value in the line U [ACCU]. --> The voltage must be >= 3 V.
If the voltage of the buffer battery falls below 2.6 V, the error message Replace buffer battery
is generated.
The error message reappears every 30 minutes.
Replace the buffer battery at the next opportunity!
The capacitor (Gold cap) is only being charged when the iTNC is switched on. If the Gold cap is still
not sufficiently charged, wait a few seconds and then enter the code number 79513 again to read
the new voltage value.
If the voltage of the Gold cap does not reach 3 V or more, the MC must be replaced.
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