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DSP 3320i-ODS, DSP 3325i-ODS, DSP 3333i-ODS
User manual
Figure2-9 Back view and Bracket dimensions
512.0mm
1. Heat sink 2.
Bracket
Identification labels of the equipment：
The labels must NOT be hidden with
objects and extraneous parts (rags,
boxes, equipment, etc.); they must
be cleaned regularly and kept visible
at all times.
459mm
336mm
1
14mm
2
48mm
DSP 3320i-ODS, DSP 3325i-ODS, DSP 3333i-ODS
User manual
2.2 Function description
Operating Principle
DC power generated by PV array is filtered through
before entering into Power board. Input board also offer functions such as insulation
impedance detection and input DC voltage / current detection. DC power is converted to AC
power by Power board. AC power is filtered through Output board then AC power is fed into
the grid. Output board also offer functions such as grid voltage / output current detection,
GFCI and output isolation relay. Control board provides the auxiliary power, controls the
operation state of inverter and shows the operation status by Display board. Display board
displays fault code when inverter is in abnormal operation conditions. At the same time,
Control board can trigger the relay so as to protect the internal components.
Operating Principle
The string detection board detects the input voltage / current, analyses the operating status of each
PV string and alerts the user that a maintenance required if a problem occurs in the PV string;
The DC switch disconnects internal circuits from the DC input to facilitate maintenance;
The input and output electromagnetic interference (EMI) filters filter out the EMI inside the DASS
TECH inverter to ensure that the DASS TECH inverter meets electromagnetic compatibility
requirements;
The Input Board detects the insulation impedance of the PV array and ensures the maximum output
power of the PV system by measuring the voltages & currents of PV array and tracking the
maximum power point (MPPT);
The DC-AC conversion circuit converts DC power into AC power and then the AC power is fed
into the electric grid. The AC output power quality meets the requirements of the electric grid;
The output isolation relay isolates the inverter from the electric grid when the grid or the inverter is
faulty.
The LC filter filters out the high-frequency components from the AC output of DASS TECH
inverter to ensure that the AC output meets electric grid requirements;
The Communication Board enables the inverter to communicate via RS485, WIFI(optional), user
can access all the operating data via the web browser(PC) and APP(ios & android).
9
10
string detection board and
input board
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