SMA SC 500CP-US-10 600V - Manual (Page 31)

SMA America, LLC 3 Product Description
Operating Manual SCCP-US-BE-US_en-52 31
3.4 Remote Shutdown
By means of remote shutdown, you can selectively shut down and switch off the inverter within approximately six seconds,
from a control room for example. The function of the remote shutdown is similar to the stop position of the key switch.
If the remote shutdown function is activated from the control room whilst the inverter is in the operating state
"Grid monitoring", a motor drive automatically shuts off the DC main switch and the inverter switches to the operating
state "Stop".
If the remote shutdown function is activated from the control room while the inverter is in the "MPP load operation"
operating state, the inverter switches to the operating state "Shutdown". Once shutdown is complete, the AC contactor
and the DC main switch are switched off automatically and the inverter goes into the operating state "Stop".
The design of the remote shutdown is wire-break safe. If 24 V is present in the remote shutdown, the inverter continues to
operate in the current operating state. If the remote shutdown function is triggered or if a wire-break occurs, 0 V is present
in the remote shutdown and the inverter 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 external fast stop is to be used if the inverter is to be disconnected via an external signal in accordance with IEEE
1547 (e.g. External Unintentional Islanding Detection). The inverter comes equipped with a fast stop input. An external
switch that is switched via a 24 V signal can be connected to this fast stop input.
The external fast stop disconnects the inverter from the utility grid in less than 100 ms.
The inverter is delivered with open terminals. The following options are available for configuring the external fast stop:
• The external fast stop deactivated:
The terminals of the active fast stop are bridged. The fast stop function is thus deactivated. Bridging of the terminals
must be performed as necessary.
• The external fast stop is operating with an external 24 V voltage supply.
An external latching switch (break contact) is connected to the inverter terminals via an external 24 V voltage supply.
When the switch is closed, the all-or-nothing relay is activated and the inverter feeds into the grid.
If the fast stop is tripped, the switch opens and the relay is deactivated. The inverter is stopped and no longer feeds
energy into the grid.
Voltage ranges for the relay:
– 24 V to 30 V: The inverter is in operation.
– 0 V to 4 V: The inverter is not in operation.
The models SC 850CP-US and SC 900CP-US are only provided with transfer trip functionality to meet unintentional
islanding requirements. An external signal is required to utilize this feature.
Tripping of the fast stop function
The fast stop function should only be tripped in the event of immediate danger. Tripping the fast stop will not rapidly
discharge the capacitors. If the inverter is to be switched off and correctly shut down via an external signal, use the
input of the remote shutdown function.