ABB AC 800M Manual

Section 2 Installation Installing the SS823/SS832 Voting Unit
3BSE036351-510 A 141
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 Figure 46 on page 140, Figure 47 on page 141 and Figure 48
on page 142.
Figure 46 on page 140 show redundant power supplies powering AC 800M units.
Here the SA/SB signals also indicate physical power supplies.
Figure 48 on page 142 shows one redundant power supply powering the AC 800M
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.
Figure 47. Connection of SA/SB using Single Power Supply
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.
+24 V
0 V

ABB AC 800M Specifications

General

Brand	ABB
Model	AC 800M
Category	Controller
Language	English