4 Commissioning
SMA Solar Technology AG
User ManualSCCPXT-E7-BA-en-5830
Test point Tasks
High-current contact Check whether the high-current contacts established at the installation site are tightened to
the correct torque. If the torque is not correct, release and clean the high-current contact and
tighten with the required torque.
Terminal lugs Ensure that the terminal lugs are crimped edge to edge.
Cable support rails Ensure that the cables are adequately attached to the cable support rails.
4.3.4 Checking the High-Current Contacts Made at the Factory
High-current contacts made at the factory
High-current contacts made at the factory are marked off. Providing that the marking is not damaged and runs
across the bolted connection as shown in the figure, this means that the torque complies with the specifications.
Procedure:
• Check whether the high-current contacts made at the factory are correctly marked off.
If a high-current contact is not correctly marked off, release the high-current contact, tighten with the required
torque and mark off again.
4.3.5 Checking the Settings of the Switching Units
Test Point Tasks
AC circuit breaker Ensure that the settings comply with the specifications in the schematic diagram.
GFDI
Hygrostat
4.3.6 Checking the Connectors
Test Point Tasks
Connectors on the CAN bus Ensure that all connectors are securely in place.
Connectors on the SC20cont
Connectors on the inverter bridge
Connectors on the communication unit
Connectors on the hub
Connectors on the router
4.4 Connection and Measurement
4.4.1 Sequence for Connection and Measurement
1. Use the tap changer on the MV transformer to adjust the voltage of the utility grid (see documentation of the MV
transformer).
2. Switch the transformer field and the ring circuit of the medium-voltage switchgear on (see documentation of the
medium-voltage switchgear).
3. Measure the voltages on the primary and secondary sides of the MV transformer and record the values in the
commissioning report.
4. Ensure that the supply voltage is within the permissible voltage range of the inverter of −10% to +15%.
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