Name: Huawei SUN2000-280KTL Series
Brand: Huawei
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NO TE

● The positive and negative terminals of a PV string are connected to the PV+ and PV–

terminals of the SUN2000, respectively. The 0% position corresponds to the PV–

terminal, and the 100% position corresponds to the PV+ terminal. Other percentages

indicate that the fault occurs on a PV module or cable in the PV string.

● Possible fault position = Total number of PV modules in a PV string x Percentage of

possible short-circuit positions. For example, if a PV string consists of 14 PV modules

and the percentage of the possible short-circuit position is 34%, the possible fault

position is 4.76 (14 x 34%), indicating that the fault is located near PV module 4,

including the adjacent PV modules and their cables. The SUN2000 has a detection

precision of ±1 PV module.

● For details about the PV strings corresponding to the MPPT that may be faulty, see

Table 8-2. The fault can be located only to the MPPT level. Perform the following steps

to connect the PV strings corresponding to the faulty MPPT to the SUN2000 one by one

to further locate and rectify the fault.

● When a non-short-circuit fault occurs, the possible short-circuit percentage is not

displayed. If the insulation resistance is greater than 0.001 MΩ, the fault is not related

to short circuit. Check all PV modules in the faulty PV string one by one to locate and

rectify the fault.

Figure 8-9 Denition of the percentage of the short-circuit position

Table 8-2 Mapping between MPPTs and PV strings

MPPTn

PV String MPPTn PV String

MPPT1 PV1–PV4 MPPT2 PV5–PV9

MPPT3 PV10–PV14 MPPT4 PV15–PV18

MPPT5 PV19–PV23 MPPT6 PV24–PV28

Procedure

NO TICE

If the irradiance or the PV string voltage is too high, the insulation resistance fault

location may fail. In this case, the fault location status on the Alarm details

screen is Conditions not met. Perform the following steps to connect PV strings to

the SUN2000 one by one to locate the fault.

SUN2000-(250KTL, 280KTL, 300KTL, 330KTL) Series

User Manual 8 System Maintenance

Huawei SUN2000-280KTL Series User Manual

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