Remote Shutdown; External Fast Stop - SMA SUNNY CENTRAL 500CP XT Installation Manual

3 Product Description
If only a low data transfer rate is required for monitoring the PV system, grid operator specifications can also be
transmitted via the monitoring network. Only one network is required in this case.
The SC-COM makes all the collected data available to the PV system operator via an Ethernet connection.
The networks can be built using copper cables or optical fibers.

3.4 Remote Shutdown

By means of remote shutdown, you can selectively shut down and switch off the Sunny Central within approximately
six seconds, for example, from a control room. The function of the remote shutdown is similar to the stop function of the
key switch.
If the remote shutdown function is activated from the control room while the Sunny Central is in the operating state
"Grid monitoring", a motor drive automatically shuts off the DC switchgear and the Sunny Central switches to the
operating state "Stop".
If the remote shutdown function is activated from the control room while the Sunny Central is in the operating state
"MPP load operation", the Sunny Central switches to the operating state "Shutdown". Once shutdown is complete, the
AC contactor and the DC main switch are switched off automatically and the Sunny Central switches to the operating
state "Stop".
The remote shutdown is designed as a open-circuit fail-safe function and must be connected to a 24 V external supply
voltage. If 24 V is present in the remote shutdown, the Sunny Central continues to operate in the current operating state.
If the remote shutdown is tripped or if a wire break occurs, 0 V is present in the remote shutdown and the Sunny Central
switches from its current operating state to the operating state "Stop".
In order to be able to use the remote shutdown, the parameter ExlStrStpEna must be set to On.

3.5 External Fast Stop

The Sunny Central is equipped ex works with a fast stop input. You have the option of connecting an external switch to
this fast stop input which is activated via a 24 V signal.
The external fast stop disconnects the Sunny Central from the utility grid in less than 100 ms.
The Sunny Central is delivered ex works with open terminals. The following options are available for configuring the
external fast stop:
• The external fast stop is deactivated.
The terminals of the active fast stop are bridged. The fast stop function is thus deactivated. You will need to bridge
the terminals if necessary.
• The external fast stop is operated with internal 24 V supply.
An external latching switch (break contact) is connected to the Sunny Central terminals via the internal voltage
supply of the Sunny Central. When the switch is closed, the all-or-nothing relay is energized and the Sunny Central
feeds into the grid. If the fast stop is tripped, the switch opens and the relay is deactivated. The Sunny Central is
stopped and no longer feeds energy into the grid.
• The external fast stop is operated via an external 24 V supply.
An external latching switch (break contact) is connected to the Sunny Central terminals via an external 24 V voltage
supply. When the switch is closed, the all-or-nothing relay is energized and the Sunny Central feeds into the grid.
If the fast stop is tripped, the switch opens and the relay is deactivated. The Sunny Central is stopped and no longer
feeds energy into the grid.
Tripping of the fast stop function
The fast stop function should only be tripped in case of imminent danger. The tripping of the fast stop does not entail
rapid discharge of the capacitors. If you wish to use an external signal to switch the Sunny Central off in a controlled
manner, you should use the input of the remote shutdown function.
16 SCCPXT-IA-D7-en-42
SMA Solar Technology AG
Installation Manual