Connection Options Of The Multifunction Relay - SMA SUNNY BOY series Technical Description

SMA Solar Technology AG
3.2 Connection Options of the Multifunction Relay
The connections described in this section must only be made by electrically qualified persons.
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)).
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.
Operating mode
Fault indicator contact, error message
Fault indicator contact, operation message
Power-dependent control of loads
Control of an external fan
Control via communication
Power-dependent charging of batteries
Report switching status of grid relay
Technical Description
Function active
Position 2-3
Position 1-2
Position 1-2
Position 1-2
Position 1-2
Position 1-2
Position 1-2
ZusFunktNG-TB-en-25
Multifunction Relay
Function inactive
Position 1-2
Position 2-3
Position 2-3
Position 2-3
Position 2-3
Position 2-3
Position 2-3
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