Installation Manual

6.5.2 Operating Modes of the Multifunction Relay
Operating mode of multi-
function relay
(Mlt.OpMode)
Description
Fault indication (FltInd)
The multifunction relay controls a display device (e.g. a warning
light) which, depending on the type of connection, signals either an
error or the undisturbed operation of the inverter.
Self-consumption
(SelfCsmp)
The multifunction relay switches loads on or off, depending on the
power production of the PV system.
Control via communica-
tion (ComCtl)
The multifunction relay switches loads on or off according to com-
mands transmitted by a communication product.
Battery bank (BatCha)
The multifunction relay controls the charging of the batteries depend-
ing on the power production of the PV system.
Fan control (FanCtl)
The multifunction relay controls an external fan, depending on the
temperature of the inverter.
Switching status grid re-
lay (GriSwCpy)
The local grid operator may require that a signal is transmitted as
soon as the inverter connects to the utility grid. The multifunction re-
lay can be used to trigger this signal.
6.5.3 Connection Options
The connection procedures vary, depending on the operating mode.
Operating mode Connection option
Fault indication (FltInd)
Using the Multifunction Relay as a Fault Indicator Contact
Self-consumption
(SelfCsmp)
Controlling loads via the multifunction relay or charging batteries de-
pending on the power production of the PV system
Control via communica-
tion (ComCtl)
Controlling loads via the multifunction relay or charging batteries de-
pending on the power production of the PV system
Battery bank (BatCha)
Controlling loads via the multifunction relay or charging batteries de-
pending on the power production of the PV system
Fan control (FanCtl)
Connecting the external fan (see fan documentation)
Switching status grid re-
lay (GriSwCpy)
Reporting the switching status of the grid relay
6 Electrical Connection
SMA Solar Technology America LLC
Installation Manual 37SB30-77-1SP-US-40-IA-xx-13
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