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7
DC Input Detection
After the DC input power cable connects to the SUN2000 of this model, the SUN2000 detects the
DC input voltage of each route using the power generated by PV modules. After one PV string
correctly connects to the MPPT1 circuit, the SUN2000 can start the DC input detection function. DC
input detection can be performed automatically or manually.
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.
The DC input detection only functions when the two DC switches onSUN2000 are OFF.
The following table describes the LED indicator status and buzzer status under the condition that
the SUN2000 is detecting the DC input.
PV Connection
Indicator Status
Blinking red
Blinking green
Steady red
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 upon automatic startup.
Manual Detection
Perform manual detection by pressing the DC input detection button or using the SUN2000 app as
showing below:
•
Once the DC input detection triggered, the detection process can't be aborted or restarted until
detection cycle completed.
•
The audible alarm can be manually turned off by pressing DC input detection button twice.
DC Input detection button
Buzzer Status
No sound
No sound
Buzzing
Meaning
DC input detection is in progress.
The DC input is normal.
The DC input is abnormal.
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