6 connecting the multifunction relay, 1 connection options for the multifunction relay – SMA MULTIFUNCTION RELAY User Manual
Page 18
4 Electrical Connection
SMA Solar Technology AG
18
MFR-NR-IA-en-21
Installation Manual
4.6 Connecting the Multifunction Relay
4.6.1 Connection Options for the Multifunction Relay
There is a different connection procedure depending on which operating mode you select.
Using the multifunction relay as a fault indicator contact or operation signaling
contact
You can use the multifunction relay as a fault indicator contact for displaying or reporting inverter
errors. This requires a parallel connection. Alternatively, you can choose to have the undisturbed
operation displayed or reported. This requires a series connection. You can connect several inverters
to one fault indicator contact or operation signaling contact. You must connect the multifunction relays
of several inverters in parallel.
Fan control (FanCtl)
The multifunction relay controls an external fan depending on the
temperature of the inverter.
If the temperature of the inverter is 5°C higher than a specific
threshold set in the inverter, the fan starts automatically. If the
temperature of the inverter is 10°C below the set threshold, the
fan stops automatically.
Switching status grid relay
(GriSwCpy)
The multifunction relay switches simultaneously with the grid relay
of the inverter and transmits a signal to the grid operator.
Operating mode of
multifunction relay
(Mlt.OpMod)
Connection option
Fault indication (FltInd)
Using the multifunction relay as fault indicator contact
Self-consumption
(SelfCsmp)
Controlling loads or charging batteries in a power-dependent
way via the multifunction relay
Control via communication
(ComCtl)
Controlling loads or charging batteries in a power-dependent
way via the multifunction relay
Battery bank (BatCha)
Controlling loads or charging batteries in a power-dependent
way via the multifunction relay
Fan control (FanCtl)
Connecting the external fan (see fan documentation)
Switching status grid relay
(GriSwCpy)
Reporting the switching status of the grid relay
Operating mode of
multifunction relay
(Mlt.OpMod)
Description