Undervoltage in power section

What does F226 mean?

The DC bus voltage in the power section of the DIAX04 SSE-03VRS drive has fallen below the minimum permissible threshold. This can occur due to unstable or lost incoming AC mains supply, excessive power draw from the DC bus, or an internal fault. The drive shuts down to prevent erratic operation or damage to its components.

• Incoming AC mains voltage to the DIAX04 SSE-03VRS is too low or unstable.
• One or more phases of the AC mains supply are missing (phase loss) to the power supply unit.
• The DIAX04 SSE-03VRS power supply unit is undersized for the connected load.
• Faulty pre-charge circuit or DC link capacitors within the DIAX04 SSE-03VRS.
• External regenerative loads drawing excessive power from the DC bus, if not managed by an external braking resistor or regeneration unit.

Click steps to track your progress.

1. 1

   Measure the incoming AC mains voltage at the input terminals of the DIAX04 SSE-03VRS power supply unit. Verify it is within the specified range.

2. 2

   Check all phases of the AC mains supply for balance and presence. Look for blown fuses or tripped circuit breakers upstream.

3. 3

   Inspect the power cabling and connections to the DIAX04 SSE-03VRS power supply unit for looseness or damage.

4. 4

   Verify the DC bus voltage measurement within the DIAX04 SSE-03VRS diagnostics. Compare it with expected values for the mains voltage.

5. 5

   If the input voltage is correct and stable, and the issue persists, consider a fault with the DIAX04 SSE-03VRS power supply unit.