SMA SC 400HE - Manual (Page 17)

SMA Solar Technology AG 3 Product Description
Operating Manual SC4-63HE-BE-BEN103280 17
3.2 Indicator Lights
If a failure occurs, the indicator lights show the current status of the inverter. The indicator lights are
controlled by the Sunny Central Control.
If the yellow indicator light is on, the inverter is in "Warning" state. The inverter disconnects, but the
failure must be rectified to ensure optimum operation over the long term.
If the red indicator light is on, the inverter is in "Warning" state and there is a massive error. The inverter
has switched off automatically. The error must be rectified and acknowledged.
3.3 Key Switch
The key switch is used to switch the Sunny Central on and off.
"Start" switch position
After turning the switch to the "Start" position, the Sunny Central changes from the "Stop" operating
state to the "Waiting" operating state. If there is sufficient irradiation and a valid grid connection, the
Sunny Central switches to feed-in operation. If there is insufficient irradiation and, in turn, the input
voltage is too low, the Sunny Central remains in "Waiting" operating state.
"Stop" switch position
If the key switch is turned to "Stop" when the Sunny Central is in the "Waiting" operating state, a motor
drive automatically shuts off the main DC switch and the Sunny Central goes into the "Stop" operating
state.
If the key switch is turned to "Stop" when the Sunny Central is in "MPP Load Operation" state, the
Sunny Central switches to the "Shutdown" operating state. Once shutdown is complete, a motor drive
automatically switches off the main DC switch and the Sunny Central goes into the "Stop" operating
state.
3.4 Emergency Stop
The emergency stop button allows the user to immediately disconnect the Sunny Central from the grid
and the PV array in case of emergency.
Pressing the emergency stop button opens the DC contactor, switches off the inverter bridge and
disconnects the inverter from the AC grid.
Tripping the emergency stop function
The emergency stop function may only be tripped if there is imminent danger.
Pressing the emergency stop button does not quickly discharge the capacitors.