AEG SB4 series User Manual download pdf (Page 215)

ALU 061, ALU 071

167

3.3 Backup Battery and Monitoring the Backup

3.3.1 Supplying the Backup Voltage

You can choose between two different sources for the supply of the SRAM modules.

central rechargable battery in the subrack with standard operation

external battery via an interface connector to be disconnected/plugged in

Warning If the module is disconnected from the subrack without an external

battery being connected, you must expect data losses!

Internal Backup ( Figure 88, I):

The backup generally takes place via the rechargable battery in the controller subrack.

The PMB carries out the supply.

If an additional backup voltage is supplied via the 9 pole interface connector

(RS-232C), the module can be disconnected without loosing any information.

The lithium battery block (BAT 001) with a 9 pole plug-in port is available here. It is fed

via contacts 5 and 9 of the interface connector (see also Figure 96):

Pin 9: +U

Batt

(max. 5 V)

Pin 5: GND

3.3.2 Monitoring Functions

If the operating voltage of +5 V is valid for the memory elements and if a rechargable

battery test was not carried out, the rechargable battery is loaded with approx. 100 mA.

If the operating voltage does not reach 4.75 V, the supply of the entire memory is

switched to the rechargable battery.

The rechargeable battery test is repeated every 4 hours independently of the user pro-

gram. It can also be triggered at any time via the “batt” contact socket (acknowledge-

ment pin). The rechargable battery is loaded with approx. 1 A for 1 sec in both cases.

Result of the Measured Value:

Batt

> 3.2 V: The rechargable battery quality is normal;

the green LED is permanently lit up

Batt

< 3.2 V: The rechargable battery quality is insufficient. Marker 23 or 33 is set

and the green “batt” LED flashes with approx. 1 Hz

”batt” socket If the battery voltage does not permanently remain under 3.2 V after

the

load test, the message can be acknowledged with the “batt” pin (the

marker is reset; the green LED lights up permanently).

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AEG SB4 series User Manual Page 215