If the SUN2000 reaches the end of its service life, dispose of it according to local
regulations for the disposal of electrical equipment.
Step 4 Install a new SUN2000. For details, see 4 Installation and 5 Electrical
Connections.
----End
8.6 Resetting and Turning On the DC SWITCH
Prerequisites
If string backfeed, string connection in reverse polarity, or internal inverter fault is
displayed on the mobile app or remote monitoring system and the DC SWITCH is
in the TRIP position, the DC SWITCH has been automatically turned
o. In this
case, rectify the fault based on the alarm handling suggestions before turning on
the DC SWITCH.
Procedure
Step 1 Set the DC SWITCH to OFF.
Step 2 Set the DC SWITCH to ON.
----End
8.7 Locating Insulation Resistance Faults
If the ground resistance of a PV string connected to the SUN2000 is too low, the
SUN2000 generates a Low insulation resistance alarm.
The possible causes are as follows:
● A short circuit occurs between the PV array and the ground.
● The ambient air of the PV array is damp and the insulation between the PV
array and the ground is poor.
After the Low insulation resistance alarm is generated, the SUN2000
automatically triggers insulation resistance fault location. If the fault location is
successful, the location information is displayed on the Alarm details screen of
the Low insulation resistance alarm on the FusionSolar app.
Log in to the FusionSolar app, choose Alarm > Active alarm, and choose Low
insulation resistance to enter the Alarm details screen.
SUN2000-(250KTL, 280KTL, 300KTL, 330KTL) Series
User Manual 8 System Maintenance
Issue 07 (2023-06-30) Copyright © Huawei Technologies Co., Ltd. 82
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