DSP_B Fault: Parallel communication error

The "DSP_B Fault" error typically indicates a communication issue between the master and slave Digital Signal Processors (DSPs) within the inverter. The DSP is a specialized microprocessor that handles complex calculations for controlling the inverter's operation, including monitoring grid parameters and adjusting power output.

Why it's problematic

Communication failures between the main and slave DSPs can disrupt the inverter's ability to function correctly, leading to a shutdown to prevent potential damage or safety risks.
This interruption can cause a loss of solar energy production and affect the overall efficiency of the system.

Possible causes

Loose or damaged communication cables within the inverter: Vibrations or physical impacts during installation or operation can loosen or damage internal wiring, disrupting the signal flow between the DSPs.
Component failure: A malfunctioning DSP or related circuitry, possibly due to overheating, power surges, or manufacturing defects, can cause a breakdown in communication.

Before you begin

Safety First: Working with electrical equipment always involves risks. Ensure you are qualified and follow appropriate safety precautions. Disconnect the inverter from both AC and DC sources before performing any physical inspection or adjustments.

Gather Information: Before starting troubleshooting, have the inverter manual on hand. You should also gather information about the inverter model and serial number, the installation date, and the PV array configuration (number of panels, capacity, and number of strings).

Troubleshooting steps

Restart the inverter: Power cycling the inverter can often resolve temporary communication glitches or software errors that might be affecting the DSPs' interaction.
Check for external sources of EMI: If strong electromagnetic fields are suspected, try temporarily moving the inverter or the potential source of interference away from each other to see if the error clears. If this resolves the problem, consider shielding the inverter or relocating it to a location with less EMI.
Check for physical damage or loose connections: If the inverter has experienced any physical shocks or vibrations, carefully inspect the internal components and wiring for any signs of damage or loose connections. Note: This step should only be performed by qualified personnel with experience in handling electrical components.

Verifying the solution

After completing the steps, monitor the inverter display for the disappearance of the "DSP_B Protection" error. If the communication between the DSPs is re-established, the inverter should resume normal operation, indicated by the status LED lights and power generation readings on the display.

If the problem is not resolved

If the error persists after following all the steps, there might be an internal fault within the inverter.

As a system owner: In this case, contact the inverter installer or distributor for further assistance. You can find the details of your installer in the MyAutarco app.
As a certified installer: Contact Autarco Support, you can submit a support case via Helios.