SMA Solar Technology AG
Using the Multifunction Relay as a Fault Indicator Contact
You can use the multifunction relay as a fault indicator contact and have an error or smooth
operation of the inverter displayed or signaled via a suitable display device. You can connect
multiple inverters to one fault indicator or operation indicator, as needed.
Operation message
Fuse
B
F
1
2
3
B
F
1
2
3
B
F
2
1
3
Light on
Trouble-free
operation (B)
Figure 9 : Circuit diagram with multiple inverters for connection to an operation indicator and circuit diagram for
connection to a fault indicator (example)
Installation Manual
=
max. 30 V
B
1
2
B
1
2
B
2
1
Grounding,
if applicable
Error message
=
DC
Fuse
F
3
F
3
F
3
Error (F)
STP33-62-US-41-IA-xx-14
6 Electrical Connection
Error in the
inverter
Inverter
in operation
Inverter
in operation
Light on
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