Regenerative Resistor Overheat (α i PSR)

What does H mean?

This alarm indicates that the temperature of the regenerative resistor in the α i PSR unit has risen abnormally high. This can be caused by the resistor not being detected, an undersized resistor, excessive regenerative power, or a stopped cooling fan.

• Regenerative resistance not detected.
• Insufficient regenerative resistance specification.
• Excessive regenerative power due to high acceleration/deceleration frequency.
• Regenerative resistor cooling fan has stopped.

1. 1

   Check the wiring for the regenerative resistance.

2. 2

   Review the specification for the regenerative resistance to ensure it is adequate for the application.

3. 3

   Reduce the frequency at which acceleration/deceleration occurs to manage regenerative power.

4. 4

   Check to see if the regenerative resistor cooling fan has stopped and replace it if necessary.