User’s Guide for EM760 series high-performance vector inverter Chapter 6 Solution Protection content When any abnormality occurs to the inverter, the digital keyboard display will show the corresponding protection code and parameters, the protection relay and protection output terminal will work, and the inverter will stop the output. In case of protection, the motor will stop rotating normally or slow down until it is stopped. The protection contents and solutions of the EM760 series inverter are shown in Table 6-1. Table 6-1 Protection Contents and Solutions of EM760 Series Inverter 41 Protec tion Protection Type Protection Cause Protection Solution code E01 Short circuit protection 1.
Inter-phase short circuit 2. Short circuit of the external braking resistor. 3. The inverter module is damaged. 1. Check the wiring for short circuits. 2. Investigate the cause and reset the controller after implementing the corresponding solutions. 3. Seek technical support. E02 Instantaneous overcurrent 1. The acceleration and deceleration time is too short. 2. In the V/F drive mode, the V/F curve setting is unreasonable. 3. The motor is running during startup. 4. The motor used is beyond the capacity of the inverter or the load is too heavy. 5. Motor parameters are not suitable and need to be identified. 6. The phases on the output side of the inverter are short-circuited. 7.
The inverter is damaged. 1. Increase the acceleration and deceleration time. 2. Reasonably set the V/F curve. 3. Enable speed tracking or start DC braking. 4. Use the appropriate motor or inverter. 5. Identify the motor parameters. 6. Check the wiring for short circuits. 7. Seek technical support. E04 Steady-state overcurrent The same as E02 The same as E02 E05 Overvoltage 1. The deceleration time is too short, and the motor has too much regenerated energy. 2. The braking unit or braking resistor forms an open circuit. 3. The braking unit or braking resistor does not match. 4. The power voltage is too high. 1. Increase the deceleration time. 2.
Check the wiring of the braking unit and braking resistor. 3. Use a suitable braking unit/braking resistor. 4. Reduce the power voltage to the specified range. 5. For the model of the built-in braking