Inverter overload detection

Function
This function enables to automatically increase the continuous output current and the inverter overload capacity when the ambient temperature is low.

Set [F631: Inverter overload detection] to "1: Temperature estimation".
• If the inverter overload trip "OL1" occurs, you can clear it by decreasing the value of [F601: Stall prevention level 1] or setting [ACC: Acceleration time 1] or [dEC: Deceleration time 1] to a longer value.
• To protect the inverter unit, you cannot turn off inverter overload detection.
0: 150%-60s (HD rating) or 0: 120?-60s (ND rating)
The inverter is protected with the uniform overload curve of 150%-60s (120%-60s for ND rating), regardless of temperature.
1: Temperature estimation
Estimate inverter internal temperature rise and automatically adjust overload protection characteristics.

• When the output frequency is 0.1 Hz or less, or when the output current is 150% or more, the overload trip "OL1" or overcurrent trips "OC1 through OC3" may occur in shorter time to protect the inverter.
• In the default setting, when inverter overload occurs, the inverter is designed to suppress the overload trip "OL1" or overcurrent trips "OC1 through OC3" by automatically decrease the carrier frequency. A lower value of the carrier frequency increases the acoustic noise from the motor but does not affect the performance. When you do not want to lower the value of the carrier frequency, set [F316: Carrier frequency control] to "0: No decrease”.
• The overload detection level depends on the output frequency or carrier frequency.

Please reference latest AS3 Instruction Manual more details or latest information.

AS3 fault codes, descriptions, symptoms and suggested remedies can be found in the below links. Each fault code can also be linked to directly from the AS3 by accessing the QR code on a mobile device while the AS3 is currently experiencing the fault.