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DSP 3320i-ODS, DSP 3325i-ODS, DSP 3333i-ODS
User manual
2.3 Protection modules
A. Anti-islanding
In the event of a local grid outage by the electricity company, or when the equipment is switched off for
maintenance operations, the inverter must be physically disconnected safely, to ensure protection of people
working on the grid, all in accordance with the relevant national standards and laws. To prevent possible
islanding, the inverter is equipped with an automatic protective disconnection system called "Anti-Islanding".
B. RCMU
DASS TECH inverter are equipped with a redundancy current device to monitor ground leakage current sensitive
to all components of both direct and alternating current. When the steady-state leakage current is larger than
300mA or instant leakage current is higher than 30mA/60mA /150mA, inverter will disconnect the grid in
different time delay.
C. Grid monitoring
Continuous monitoring of the grid voltage to ensure the voltage and frequency values stay within operating
limits.
D. Inverter internal device protection
The inverter has all kinds of internal protection to protect the device inside when grid or input DC side have
abnormal situation.
E. Ground fault protection
This inverter must be used with panels connected with "floating" connections, that is, with positive and negative
terminals without ground connections， or it may damage the inverter. An advanced ground fault protection
circuit continuously monitors the ground connection and disconnects the inverter when a ground fault is detected.
The ground fault condition is indicated by a red LED on the front panel.
2.4 Efficiency and derating curve
Efficiency curve
100
98
96
94
92
90
88
86
5% 10% 20% 30% 40% 50% 60% 75% 80% 90% 100%
% of Rated Output Power
DASS TECH inverter outputs 230V AC/50Hz
Vpv=450V
Vpv=600V
Vpv=800V
DSP 3320i-ODS, DSP 3325i-ODS, DSP 3333i-ODS
User manual
Input voltage derating curve
40000
35000
30000
25000
20000
15000
10000
0
250 350 440 500 600 700 850 900 950
DASS TECH inverter outputs 230V AC/50Hz
Output voltage derating curve
40000
36000
32000
28000
24000
20000
16000
12000
8000
4000
0
180 190 200 210 220
13
14
Output Power vs Input Voltage
Vin(V)
Output Power vs Grid Voltage
230 240
250
260
270 280
290
300
310
320
Vgrid(V)
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