Connecting Cables To Staubli Mc4 Connectors - Huawei SUN2000-100KTL-M2 User Manual

SUN2000-(100KTL, 110KTL, 115KTL)-M2
User Manual

5.7.3 Connecting Cables to Staubli MC4 Connectors

Specification Requirements
Cables with high rigidity, such as armored cables, are not recommended, because
poor contact may be caused by the bending of cables.
Use the Staubli MC4 connectors delivered with the solar inverter. If the PV
connectors are lost or damaged, purchase the connectors of the same model. The
device damage caused by incompatible PV connectors is beyond the warranty
scope.
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 07 (2023-04-30)
CA UTION
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 5-26 Testing the insulation resistance
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