Changing The Main Battery - Siemens SIMATIC HMI Operating Instructions Manual

Installation and connection
4.8 Inserting, charging and changing the battery
①
②
Briefly press the pushbutton on the battery.
The LEDs on the LED display will briefly light up to show the charging condition. The LEDs
will light up according to the charging status. If all the LEDs light up, the battery is fully
charged. If no LEDs light up, the battery is flat.
4.8.4

Changing the main battery

Introduction
CAUTION
Shutdown or global rampdown
If the bridging battery can no longer be charged, the HMI device will switch off the next time
the main battery is changed.
Change the bridging battery at least every 5 years.
Note
Change the main battery in good time!
We recommend that you replace the battery when it can only be charged to 50%. This is the
case after approximately 500 complete charging cycles.
A charging cycle is complete when the battery is fully charged.
Example:
The battery has a charging condition of 80%. It needs another 20% before it is fully charged.
The battery is charged. This charging process counts as one fifth of a complete charging
cycle.
We recommend keeping an inventory of spare main batteries.
You can replace the main battery during operation. The bridging battery supplies power to
the HMI device while the main battery is being changed. The maximum buffer time is 5
minutes.
While the power is being drawn from the bridging battery, the following features are
deactivated:
● Display backlighting
● The function keys and associated LEDs
● All LEDs except for "SAFE" and "RNG"
● The illuminated pushbuttons and handwheel
● USB interface
88
Pushbutton
LED display
Mobile Panel 277F IWLAN
Operating Instructions, 12/2007, A5E01003940-01