Regenerative Discharge Unit Overheat

What does 404 mean?

The regenerative discharge unit has overheated, typically triggered when the average regenerative discharge energy is excessively high, such as during frequent acceleration/deceleration cycles. This can also indicate connection issues or component failure within the unit.

• Average regenerative discharge energy is too high, often due to high acceleration/deceleration frequency.
• Improper connection of the separate regenerative discharge unit.
• Defective thermostat within the separate regenerative discharge unit.
• Defective resistor within the separate regenerative discharge unit (resistance outside ±20% of predetermined value).
• CXA20 and/or CZ6 connectors not short-circuited by dummy connectors when a separate regenerative discharge unit is not used (specific to SVM1-4i/SVM1-20i or SVM1-40i/SVM1-80i models).

1. 1

   For SVM1-4i/SVM1-20i (without separate unit): Check if the CXA20 connector is short-circuited with a dummy connector.

2. 2

   For SVM1-40i/SVM1-80i (without separate unit): Check if the CXA20 and CZ6 connectors are short-circuited with dummy connectors.

3. 3

   Decrease the acceleration/deceleration frequency to reduce average regenerative discharge energy.

4. 4

   Verify the physical connection of the separate regenerative discharge unit.

5. 5

   Disconnect the separate regenerative discharge unit; check the thermostat. If the thermostat is open when the unit is cool, replace the unit.

6. 6

   Disconnect the separate regenerative discharge unit; measure its resistance. If it is not within ±20% of the predetermined resistance, replace the unit.