SMA Sunny Boy Series - Connection Options of the Multifunction Relay

SMA Solar Technology AG Multifunction Relay
Technical Description ZusFunktNG-TB-en-25 9
3.2 Connection Options of the Multifunction Relay
The connections described in this section must only be made by electrically qualified persons.
In the event of inverter voltage loss, the multifunction relay switches from the position 1-2
(Operation, B) to the position 2-3 (Error, F).
As a result of this relay switching behavior, there are two connection options:
• Use as fault indicator contact:
– The function to be switched is inactive in
relay position 1-2 (B)
– The function to be switched is active in
relay position 2-3 (F)
• Use for the switching of loads:
– The function to be switched is active in
relay position 1-2 (B)
– The function to be switched is inactive in
relay position 2-3 (F)
If you connect the multifunction relay to the utility grid, you must protect it with an individual circuit
breaker.
In the following table the various operating modes with the respective relay positions with active and
inactive function are listed.
NOTICE!
Destruction of the multifunction relay due to too high contact load
• Adhere to the maximum switching voltage and maximum switching current
(see Section 3.4"Technical Data of the Multifunction Relay" (page17)).
• Only connect suitable relays downstream (see Section 3.2.2"Connection for the
Control of a Load" (page11)).
Operating mode Function active Function inactive
Fault indicator contact, error message Position 2-3 Position 1-2
Fault indicator contact, operation message Position 1-2 Position 2-3
Power-dependent control of loads Position 1-2 Position 2-3
Control of an external fan Position 1-2 Position 2-3
Control via communication Position 1-2 Position 2-3
Power-dependent charging of batteries Position 1-2 Position 2-3
Report switching status of grid relay Position 1-2 Position 2-3