Managing Inverter Parallel Synchronous Signal Abnormal Alarms in Sungrow SH15/20/25T Hybrid Solar Inverters
When managing a hybrid solar inverter with multiple inverter units, ensuring proper communication and synchronization between devices is crucial. An “Inverter Parallel Synchronous Signal Abnormal” alarm in your Sungrow SH15/20/25T hybrid solar inverters signifies issues in the synchronization process between the master and slave inverters. This blog post provides a detailed guide on troubleshooting and resolving such alarms, ensuring your system operates efficiently and reliably.
## Understanding Inverter Parallel Synchronous Signal Alarms
This specific alarm indicates a disruption in the synchronization signals necessary for parallel operation of multiple inverters. These signals are vital for the coordinated operation of the inverters, affecting everything from load sharing to overall system efficiency.
### Common Causes of Synchronous Signal Issues:
– Incorrect master and slave configuration settings.
– Faulty or improper parallel communication wiring.
– Absence of or incorrectly connected termination resistors.
## Step-by-Step Troubleshooting Guide
### Step 1: Check Master and Slave Settings
Correct settings are foundational for proper inverter operation:
– **Verify Master-Slave Configuration**: Ensure that one inverter is set as the master and the others as slaves. This configuration should be explicitly defined in the inverter settings.
– **Confirm Slave IDs**: Check that slave inverters have unique IDs assigned in a sequential order that matches the physical and logical layout of your system.
### Step 2: Inspect Parallel Communication Wiring
Proper wiring ensures uninterrupted communication:
– **Examine Wiring Connections**: Focus on the CAN bus connections, specifically the CAN2H and CAN2L wires in the COM1 ports. These should be correctly wired between the master and each slave inverter.
– **Follow Wiring Diagrams**: Refer to the Sungrow installation manual’s wiring diagrams to verify that all connections are made correctly and securely.
### Step 3: Ensure Proper Termination
Termination resistors are crucial for stabilizing communication lines:
– **Check Termination Resistor**: Locate the last inverter in the communication chain and check for a 120Ω termination resistor between the CAN2H and CAN2L wires.
– **Install if Missing**: If the termination resistor is missing or improperly connected, install it as per the instructions. This resistor is typically included in the inverter’s accessories kit.
### Step 4: Test the System
After making any adjustments, it’s important to test the system:
– **Restart the System**: Power cycle the inverters to reset the communication system.
– **Monitor for Alarms**: Keep an eye on the system to see if the synchronous signal abnormal alarm clears and to ensure there are no further communication issues.
## Conclusion
An “Inverter Parallel Synchronous Signal Abnormal” alarm in Sungrow SH15/20/25T hybrid solar inverters requires immediate attention to prevent potential disruptions in system performance. By methodically checking the master-slave settings, verifying the integrity and correctness of wiring, and ensuring proper termination, most issues can be resolved effectively. Should these steps not rectify the problem, further assistance from Sungrow support is advised to diagnose and address more complex issues. Regular maintenance and checks can help prevent such alarms and ensure that your solar system operates at optimal efficiency.
