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4.2
Battery Mode
Charge-Status
The battery has electronic circuitry for showing the current charge
Indicator
status. The electronics incorporate a metering unit which has to be
calibrated at regular intervals so that it can compensate for error. The
chemical properties of the battery change in the course of time, so the
electronics have to relearn the battery's characteristics at regular
intervals. A teach-in cycle ensures that the battery's maximum charge
capacity is at your disposal.
Note
There is a danger of the charge-status indicator misinterpreting the
actual capacity of the battery if a lengthy period of time is allowed to
pass between teach-in cycles. This can result in an unexpected
shutdown with no prior warning.
Teach-in Cycle
Run a teach-in cycle:
(calibration cycle)
Performing a
Broadly speaking, the procedure for a teach-in cycle is as follows:
Teach-in Cycle
PG 720 PII Programming Device
C79000-G7076-C756-02
once every month,
if a prolonged period of time has elapsed since the battery was last
used,
if you think that the battery no longer operates at full capacity,
if the programming device shuts down unexpectedly with no prior
warning,
if operating time on battery becomes shorter.
If during startup the error message "Battery needs calibration
cycle" appears (has to be acknowledged with the F1 key).
Charge the battery until the charge-status indicator shows 100%.
See the section entitled "Displaying Charge Status" for instructions
on how to view the indicator.
Leave the programming device switched on to drain the battery: the
programming device will switch itself off when the battery is
discharged. Remember to disconnect the power unit from the
PG 720 so that the battery can discharge.
Once the programming device has switched itself off, start another
charge cycle by reconnecting the external power unit to the PG 720.
The teach-in cycle terminates automatically approximately 10
minutes later.
Installing and Operating the PG 720
4-3
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