Huawei SUN2000-111KTL-NHM0 User Manual page 69

SUN2000-111KTL-NHM0
User Manual
Procedure
Step 1 Prepare the DC input power cables.
Step 2 Crimp positive and negative metal contacts.
Step 3 Insert the contacts into the corresponding positive and negative connectors.
Step 4 Tighten the lock nuts on the positive and negative connectors.
Step 5 Use a multimeter to measure the voltage between the positive and negative
terminals of the PV string (measurement range no less than 1100 V).
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Step 6 Use an insulation resistance tester to test the insulation resistance between the
PV– cables and the ground: Add 1500 V DC voltage between the PV– cables and
the ground and check the insulation resistance.
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Issue 09 (2023-12-18)
If the voltage is a negative value, the DC input polarity is incorrect and needs
correction.
If the voltage is greater than 1100 V, too many PV modules configured to the
same string. Remove some PV modules.
If the insulation resistance is greater than or equal to 1 MΩ, it is normal.
If the insulation resistance is less than 1 MΩ, troubleshoot the cable
insulation.
Figure 5-16 Testing the insulation resistance
NO TE
You can use a self-made tool to connect all PV– cables together through an adapter to
test the insulation resistance between all PV– cables of a device and the ground at a
time.
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5 Electrical Connections
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