AEG SB4 series User Manual download pdf (Page 43)

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Operating

2.5 Switching the Supply Voltage On and Off

The supply voltage is switched on and off by:

The user switching the system on and off

The system being switched on and off by a powerfail

It is to be ensured in both cases that dangerous process statuses do not occur during

the voltage failure or when the voltage returns. This is to be stressed especially for a

powerfail since the voltage returns at an undefined time as opposed to the system be-

ing switched on and off by the user.

2.5.1 The System is Switched On and Off by the User

The programmable controller is switched on and off via the central power supply (pow-

er supply in Fig. Figure 25 on page 19) Check that all the measures mentioned in point

2.5.3 are guaranteed before you switch off the system.

2.5.2 The System is Switched On and Off by a Powerfail

The risk of a powerfail is permanent. Therefore always ensure that the measures men-

tioned in point 2.5.3 are guaranteed.

2.5.3 Check Measures (Inspection)

Always Ensure an Intact Rechargable Battery

Ensure that the rechargable battery in the primary subrack is functioning correctly so

that the program and data are not lost if the voltage supply should fail. A used re-

chargable battery is therefore to be replaced immediately.

Do not Adjust DIP Switches

DIP switches can be found on the SC 8xxx and ALU 0x1 modules and serve to set

the writing protection and some status bits (ALU 061 only). Their position is deter-

mined in the configuration stage and may not be adjusted afterwards (basic rule).

Exceptions are to be mentioned explicitly.

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AEG SB4 series User Manual Page 43

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