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Installing 575 System Hardware SIMATIC 545/555/575 System Manual

4.8 Installing the Battery

For the 575 controller, a 4 V, 5 amp-hour (Ah) maintenance-free gel cell

battery and cable are included with the base. The battery is continuously

recharged by the power supply and maintains user memory and

programming during a power loss. The 5 Ah battery will maintain the

memory until the battery is depleted. The length of battery-maintained

memory time may be calculated by totaling the battery backup current for

the entire chassis and dividing the 5 Ah by this current. For example:

Total battery backup current for two 575 CPUs = 2 x (1mA) =2 mA

5 Ah/2 mA = 5 Ah/0.002 A = 2500 hours = 104 days of battery life

WARNING

If the battery is discharged completely (below 3.6 V), it may be damaged so that

it does not recharge.

This can cause unpredictable operation that could result in death or serious

injury to personnel, and/or damage to equipment.

Disconnect the battery if the system is to be left unpowered for an extended

period. The formula listed above shows you how to calculate battery life.

Mount the battery in an accessible location, as shown by Figure 4-12. Be

sure that the battery is disabled for the initial powerup of your system.

WARNING

Do not install the battery in a gas-tight enclosure. The battery can vent

explosive gases that must be allowed to dissipate through adequate ventilation.

These gases could explode if adequate ventilation is not available; an explosion

could result in death or serious injury to personnel, and/or damage to

equipment.

Ensure that you install the battery in a well-ventilated enclosure so that the

explosive gases can dissipate.

Battery Backup for

the 575

Mounting the

Battery

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Siemens SIMATIC TI500 Especificaciones Pagina 103