External Power Unit And Battery - Siemens SIMATIC PG 720 P Manual

Getting to Know the PG 720
3.7

External Power Unit and Battery

External Power The external power unit is used to supply the PG 720 with power when it is
Unit being operated with 115 V or 230 V mains supplies. The voltage range is set
automatically. In mains power supply operation, the integrated battery is
charged at the same time. The connecting cable to the PG 720 has an external
power supply unit. For connection to the power system, the external power
supply unit has a connector for non-heating appliances.
Figure 3-13 External Power Supply Unit
Caution
!
Danger of overheating!
The external power supply unit can be damaged if it is covered.
Battery
The PG 720 has an integrated NiMH (nickel metal hydride) rechargeable
battery. This makes the device portable, meaning you can use it without the
external power supply. The battery also prevents data loss occurring on
power failure.
Once the external power supply unit is connected, the battery is charged. The
following conditions are important:
3-18
When charging, the battery temperature must be between + 5 C and
+ 40 C (40 F and 100 F).
When the device is switched off, charging takes approximately 2 hours
(fast charging).
When the device is switched on, charging takes approximately 6 hours
(reduced charging current).
Charging stops as soon as the battery is fully charged.
In storage, a fully charged battery runs down in approximately 2 months.
It must then be recharged.
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PG 720 P Programming Device
C79000-G7076-C721-02