Cause : Inverter overload comes when the adjustable frequency drive is about to cut out because of an overload (current too high for too long). The counter for electronic, thermal inverter protection issues a warning at 98% and trips at 100%, while giving an alarm. The adjustable frequency drive cannot be reset until the counter is below 90%. The fault is that the adjustable frequency drive has run with more than 100% overload for too long.

• Compare the output current shown on the LCP with the adjustable frequency drive rated current.
• Compare the output current shown on the LCP with measured motor current.
• Display the thermal drive load on the LCP and monitor the value.
• When running above the adjustable frequency drive continuous current rating, the counter increases.
• When running below the adjustable frequency drive continuous current rating, the counter decreases.