SMA SI 4548-US - Manual (Page 139)

SMA America, LLC 15 Relays
Operating Manual SI4548-6048-US-BE-en-20 139
15 Relays
The Sunny Island offers you several options for the control of internal and external processes. Two
multi-function relays are integrated into the device to which you can assign functions using the
parameters "241.01 Rly1Op" and "241.02 Rly2Op" (see Section 6.4.6 "Multifunction Relay 1 and
2", page 58).
The different settings have the following meanings:
Function/
Setting Meaning Function description
Off Off Relay remains permanently switched off
(deactivated).
On On Relay remains permanently switched on (e.g. relay
function test during commissioning).
AutoGn Automatic generator request The generator is automatically activated due to set
criteria (see Section 14.1.5 "Automatic Generator
Operation", page 122).
AutoLodExt Automatic load shedding
dependent on an external
source Automatic connection / disconnection of loads.
Connection occurs if the device is connected to an
external source (e.g. generator), or if the Lod1Soc
limits are exceeded (see Section 12.1 "Load
Shedding", page 102).
AutoLodSoc1 Auto LoadShedding Soc1 Automatic connection / disconnection of loads.
Connection only if Lod1Soc limits are exceeded
(see Section 12.1 "Load Shedding", page 102).
AutoLodSoc2 Auto LoadShedding Soc2 Automatic load disconnection. Connection only if
Lod2Soc limits are exceeded (see Section 12.1
"Load Shedding", page 102).
Tm1 Timer 1 (time-controlled
switching of relay 1) Programmable timer (once, daily, weekly) with
duty cycle.
Tm2 Timer 2 (time-controlled
switching of relay 2) Programmable timer (once, daily, weekly) with
duty cycle.
AptPhs Absorption phase is active Relay switching when battery charge is in
absorption phase.
ExtPwrDer External power reduction The Sunny Island controls additional loads in order
to put excess energy to practical use. When
excessive energy can be used, the multifunction
relay is activated.
GnRn Generator active Relay switching when generator is in operation
and connected.