ABB AC 800M Manual page 141

Section 2 Installation
Power Supply Supervision
The status of power supplies in redundant configuration can be supervised via the
SS8xx voting unit. The supervision signals SA and SB from the SS8xx are
connected to the corresponding terminals of the CPU.
+ 24 V on the SA/SB indicates working power supplies. 0 V on SA/SB indicates an
error in the corresponding power supply and lack of redundancy. SA/SB signal
connection is shown in
on page 142.
Figure 46
Here the SA/SB signals also indicate physical power supplies.
Figure 48
units and one for powering field equipment. An SA/SB error indication can not
indicate which physical power supply that has failed, only that there is a failure.
To avoid error indications from SA/SB when single power supply is used, it is
recommended to connect the input terminals SA/SB on the CPU to +24 V,
see
Figure 47. Connection of SA/SB using Single Power Supply
3BSE036351-510 A
Figure 46
on page 140 show redundant power supplies powering AC 800M units.
on page 142 shows one redundant power supply powering the AC 800M
Figure 47.
Installing the SS823/SS832 Voting Unit
on page 140, Figure 47 on page 141 and Figure 48
+24 V
0 V
141