Siliken SE3.3Ni, Руководство пользователя

Страница: 29 / 58

Operation
28
user’s manual inverter SE3.3Ni - SE3.8Ni - SE4.6Ni
3.1 Overview
The SE inverter shall operate automatically. Once the solar radiation is strong enough to make the PV array generate DC input voltage that
goes up and over the pre-set threshold value, the inverter turns itself on and feeds power into the mains after all necessary conditions are
checked and fulfilled. The inverter goes into monitoring mode from the grid feeding mode if the DC input voltage is under the pre-set threshold
value but above the minimum MPP voltage. Once the DC input voltage falls below the minimum MPP voltage, the inverter will shut down itself.
There are five main operating modes described in detail below.
System Check :
When the DC input voltage goes above the minimum MPP voltage, the inverter is powered-up, and enters the system check mode. In this
operating mode, the inverter sets the initial values, runs diagnostic, and detects all parameters that will be stored for future use. This stage
takes only a few seconds.
Monitoring :
After system check is done the inverter enters the monitoring mode. In this operating mode, the inverter monitors all parameters on both AC
and DC sides in order to insure that connecting to the mains is safe. All conditions must be fulfilled and last for a certain period of time, then
the system will enter the grid feeding mode. It takes around 20 seconds to complete the monitoring mode. If any parameter except the DC
input voltage that is under the threshold value does not meet the criteria, the inverter goes to Fault mode.
Grid/MPPT :
After the monitoring mode, the SE inverter confirms that all conditions necessary for feeding the power into the mains utility are fulfilled. The
inverter will turn on the AC relays and start feeding the AC power into the mains. In this operating mode, the inverter continues to convert the