SMA SC 200 - Manual (Page 13)

SMA Solar Technology AG Safety
User Manual SC-BEN100262 13
Operating mode Explanation
Stop The Sunny Central is switched off. The Sunny Central remains in this
condition until the key switch is turned to "Start".
Wait If the key switch is set to "Start", the Sunny Central goes into to the "Wait"
mode.
The start voltage "VpvStart" must be adjusted to conform to the PV
generator connected to the Sunny Central. Check and adjust the start
voltage as necessary.
If the input voltage is below the set start voltage "VpvStart", the Sunny
Central remains in "Wait" mode. The value for "VpvStart" is shown in the
display of Sunny Central Control.
If the input voltage is higher than the start voltage "VpvStart", the Sunny
Central waits until the time defined in the parameter "TStart" has elapsed.
If the input voltage has not fallen below the start voltage "VpvStart" during
this period, the Sunny Central checks whether there is connection to the AC
grid. If there is a valid AC grid connection, the AC contactor closes and the
Sunny Central transfers to grid monitoring.
Grid Monitoring The grid is monitored for adherence to grid limits for the monitoring time
"GriGrdMonTm". If the grid limits are not exceeded during this time, the
Sunny Central goes into the "Startup" mode.
Startup After completing grid monitoring, the Sunny Central navigates to its first
operating point and commences grid feed.
MPP load operation In MPP operation the Sunny Central feeds power to the grid and operates
continuously at the maximum power point (MPP).
Shutdown The Sunny Central shuts down (switches off) in the following cases:
• The power measured during the time interval "TStop" is less than
"PpvStop".
• A failure has occurred which necessitates shutdown of the Sunny
Central.
• The key switch is set to "Stop".
Failure If a fault occurs during operation, the Sunny Central shuts down and the
Sunny Central Control displays the fault. You will find a list of faults in
section 15 ”Troubleshooting and Problem Solving” (page 80).