SMA SUNNY CENTRAL 900CP XT - Startup; In Normal Operation: Active Power Ramp-Up; After Grid Fault: Decoupling Protection Ramp; Load Operation

10 Function Description
SMA Solar Technology AG
User Manual 83SCCPXT-E7-BA-en-58
10.1.5 Startup
10.1.5.1 In Normal Operation: Active Power Ramp-Up
The inverter works up to its maximum feed-in power via a ramp. This means that the inverter gradually increases the
ratio of feed-in power per second by the value set in the parameter WGra.
10.1.5.2 After Grid Fault: Decoupling Protection Ramp
After a grid fault, the inverter restarts at a maximum of 10% nominal power per minute using a decoupling protection
ramp. You have the option of switching this decoupling protection ramp on or off. If you deactivate the decoupling
protection ramp, the inverter rapidly reverts to maximum power. If you wish to deactivate the decoupling protection
ramp, contact us (see Section13 "Contact", page153).
10.1.6 Load Operation
10.1.6.1 MPP
In the MPP operating state, the inverter feeds power into the utility grid and operates permanently at the Maximum
Power Point (MPP). Operation and the amount of power being fed in appear on the touch display. If the measured
power P
PV
during the time interval PvPwrMinT is less than the minimum feed-in power PvPwrMin or the key switch is
set to Stop, the inverter switches to the operating state "Shutdown".
10.1.6.2 Q at Night
With the order option "Q at Night", the inverter can provide reactive power in order to stabilize the utility grid during
non-feed-in operation, e.g. at night. This function is independent of normal feed-in operation. Only limited dynamic grid
supportis available in the operating state "Q at Night".
Figure 16: General overview of the operating states of the inverter in the operating state "QatNight"