E45.03 fault in inovance IS580 drive indicates Motor KTY overheat. This means the drive has detected that the KTY sensor resistance indicates the motor is overheating.

• The drive monitors the resistance of the KTY sensor to detect if the motor temperature is too high.
• Power off the drive and wait for the motor to cool.
• If the fault clears after cooling, the overheat was real.
• Inspect wiring harness and connectors between the motor and drive.
• Confirm there are no loose connections or broken wires.