SUN2000-(55KTL, 60KTL) Series
User Manual
6 System Commissioning
Issue 02 (2017-07-30)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
57
Figure 6-1
DC terminals
Only after at least one PV string correctly connects to the MPPT1 circuit, the SUN2000
enables the DC input detection function. Therefore, you are required to connect DC input
power cables to the MPPT1 circuit first.
The DC input detection function allows only independent access from each PV string to
the inverter. That means, the PV strings cannot be connected in parallel and then to the
inverter.
Table 6-1
describes the status of the LED indicators and buzzers.
Table 6-1
LED indicator and buzzer status description
PV Connection Indicator
Status
Buzzer Status
Meaning
Blinking red
No sound
DC input detection is in
progress.
Blinking green
No sound
The DC input is normal.
Steady red
Buzzing
The DC input is abnormal.
Automatic Detection
Following are the rules for starting automatic detection:
Initial automatic detection is triggered 2 minutes after at least one PV string correctly
connects to the MPPT1 circuit.
Within three days after initial automatic detection is triggered, the SUN2000 performs
automatic detection once every 10 minutes. From the fourth day, the SUN2000 performs
automatic detection only when the PV string voltage equals the lowest operating voltage
of the SUN2000.
The DC input detection only functions when the two DC switches on the SUN2000 are
OFF.
