#1 Does anyone know what display code "E5" means?
Internal and external communication error
Explanation of error Cause: The frequency converter needs internal and external communication.When the communication cannot be reached, the internal and external units will indicate “internal and external communication error”. Only “main internal control panel, connecting cable and main external control panel” are related to communication; but sometimes the communication error will be indicated when the external unit has no power and the internal unit cannot connect with the external unit due to other errors, then such situation shall be distinguished from “pure communication error” and treated in a different way.
Inspection path: Check if the external unit can power on and work (normally, the indicator light will turn off after lighting for several seconds, relay picks up, and PTC won’t heat seriously)
1. Can power on and work: Are the internal unit and external unit matched→is the phase sequence of connecting wires of internal and external units correct (the live wire of the internal unit connects with that of the external unit, the null wire of the internal unit connects with that of the external unit)→Connecting wires touched well→Main internal control panel replacement→Main external control panel replacement
2. Cannot power on and work: Can AC 220V be delivered to the terminal block of the external unit→Can the bridge rectifier and module panel generate DC 310V→Can the main external control panel generate a low voltage power supply of DC 5V→Does the main external control panel show the status of periodical reset.
