SMA STP 50-40 Operating Manual page 44

6 Electrical Connection
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
2
1 3
B F
1 2 3
Light on
Figure 12: Circuit diagram with multiple inverters for connection to an operation indicator and circuit diagram
for connection to a fault indicator (example)
44 STP50-4x-BE-en-23
=
Trouble-free
operation (B)
Error message
max. 30 V
DC
Fuse
B F
2
1 3
B F
1 2 3
B F
1 2 3
Grounding,
if applicable
SMA Solar Technology AG
=
Error in the
inverter
Inverter
in operation
Inverter
in operation
Light on
Error (F)
Operating manual