6 Electrical Connection
SMA Solar Technology AG
Operating manualSTP50-40-BE-en-1540
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.
B F
1
2
3
B F
1
2
3
B F
1
2
3
B F
1
2
3
B F
1
2
3
B F
1
2
3
= =
Light on
Grounding,
if applicable
Trouble-free
operation (B)
Error (F)
Operation message
Error message
Fuse
Light on
Error in the
inverter
Inverter
in operation
Inverter
in operation
Fuse
max. 30 V
DC
Figure 11: Circuit diagram with multiple inverters for connection to an operation indicator and circuit diagram
for connection to a fault indicator (example)
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