FOTO CONTROL 3f 400 is device for transformation of DC voltage generated on the terminals of the solar panel after impact of photons to three phase AC power grid.

FOTO CONTROL 3f 400 is a transformerless inverter designed for direct connection of a inverter or arbitrary number of parallel ranged inverters on the primary side of the grid transformer with ratio 0.4/22 kV.

Inverters of the FOTO CONTROL 3f 400 family are able to work in wide range of input voltage – voltage of photovoltaic cells within the range from 450 V to 800 V at the rated grid voltage. The selection and structure of particular types is made according to specific solar power plant application. Three basic versions with power 6, 12.5, 33 and 40 kW are available. The suitable assignment of mentioned types and their number is an ideal solution for solar power plants with the power to 1 MW, it is also easily possible to use them for larger plants. The maximal power of the inverter is 40 kW, it was chosen as a optimal power in consideration of service characteristics: modularity of the solution, maintenance, service, , obscuration of the solar power plant part, number of strings or failure of the solar power plant section.

The main advantages of using FOTO CONTROL 3f 400:

• high efficiency 96.5 % is achieved by the use of 5th generation modern switching elements and by eliminating the self-consumption to minimum as by using the modern low loss magnetic circuits with amorphous metals and ferrite powder materials
• parallel cooperation of the inverters in an automatic cascade regime
• controlled 4 quadrant rectifier is used as a power converter, which through its control ensures very low share of higher harmonic currents (THDi max. 3%)
• full reactive control, cos φ from 0.00 to 1.00 (normal adjustment: cos φ = 1), up to its full kVA rating
• the controlled rectifier allows the automatic phasing to the three-phase network with adjusting to an instantaneous frequency and voltage
• 100% symmetry of the output power and voltage is ensured without using the „power balancer“ unit
• optimal decentralized solution with the advanta- geous proportion: number of inverters / exploitability of power plant / price
• inbuilt protection elements, inbuilt measurement of isolation state / residual currents
• connectivity of strings in enclosures with outlet DC
• compact unit with inbuilt output contactor disconnection to 10ms after the loss of a phase or unpermitted conditions of electrical grid
• inbuilt AC cut-out switch for disconnection of the device
• simple parallel coupling of inverters for higher power
• indication of kW and produced kWh for chosen time period
• meets the requirements of distribution systems for voltage and current quality, it also meets all relevant security requirements and EMC standards
• design with focus on high reliability and efficiency, lifetime several times exceeds period of returnability period, its lifetime is extended also by using foil capacitors and high quality fans
• possibility of extending the 2 years standard warranty
• communication possibilities for control by superior Control System by RS-485 with communication possibilities over Profibus DP or Modbus RTU

Options:

• telemetry – remote access to the control system of the power plant
• online visualization with secured Internet access over Ethernet, Wi-Fi , 4G
• automatic notice of alarm status and summary report by E-mail, SMS or FTP
• detachable manual graphic control panel

Basic technical data

	FOTO CONTROL 3f 400/10	FOTO CONTROL 3f 400/20	FOTO CONTROL 3f 400/33	FOTO CONTROL 3f 400/100	FOTO CONTROL 3f 400/125
Output
Rated AC power	10 kW	20 kW	33 kW	100 kW	125 kW
Rated output current	14.3 A	28.6 A	47.7 A	143 A	179 A
Input
Rated input current UDC = 600 V	17.5 A	35 A	58.3 A	175 A	219 A
Dimensions (w x h x d)	600x800x350 mm	600x1100x400 mm	800x1300x500 mm	1000x2100x500 mm	1000x2100x500 mm
Weight	90 kg	185 kg	260 kg	385 kg	385 kg

Technical data FOTO CONTROL 3f 400

Peek DC supply voltage	850 V no load
MPPT operating voltage	450 to 800 V
Output voltage	3x 400 V ±10%
Efficiency	≥ 98 %
Total efficiency	≥ 96.5 %
Euro efficiency	≥ 95 %
Output frequency	50 Hz ± 0.5 Hz
cos φ	Adjustable from -0.9 capacitive to -0.9 inductive (default = -1)
Total harmonic distortion of the output current (THDi)	Max. 3 % at rated current (THD of the grid ≤ 1,5%)
RFI filter	Inbuilt input DC filter and output AC RFI filter
Control system	32 bit. µP DSP - TI
Communication	RS 485, USB, CAN
Communication module - Optional	Profibus DP, Modbus RTU, Ethernet, GSM
Contactor at the output	YES
Time of disconnection from the grid if the grid is defective	≤ 10 ms
Control panel - Optional	Graphic, detachable, programmable
Analog inputs	4 /0 (4) – 20 mA/ / 0 (2) – 10 V/
Analog outputs	3 /0 (4) – 20 mA/ / 0 (2) – 10 V/
Relay output	3 x relay, adjustable, programmable
Protections	Current overloading, overvoltage protection of DC inputs and panels , overvoltage protection on the AC side, undervoltage, overvoltage, earth connection on the AC output, cut off between output phases, overheating of the inverter
Cooling	Forced air cooling by inbuilt ventilators
Absolute altitude of the permitted usage	≤ 1000 m over the sea, at higher altitude levels reduction of the power for each 100 m of altitude reduction of the inverter power for 1 %
Relative humidity of the air	≤ 95 % without corrosive and explosive gases, without water vapor and condensates
Ambient working temperature	+ 0 °C to + 40 °C (-20 °C to + 40 °C with optional tempering)
Storage ambient temperature	- 25 °C to + 50 °C
Protection	IP54
STN EN standards compliance	Safety EN 50 178 EMC emissions STN EN 61000-6-1,3 Harmonic distortion: STN EN 61000 – 3 – 11, STN EN 61000 – 3 – 12
Instructions EEC	2004/108/EEC, 2006/ 95/EEC