User Manual EM303B General Purpose Inverter If the setting acceleration time is too long, confirm its parameters. 10.2.4 Excessively Long Deceleration Time When dynamic brake enabled The brake resistance is too big. The dynamic brake power is too small, so the deceleration time is prolonged. The setting value of brake duty ratio (FC-16) is too small, and the deceleration time is prolonged, please increase the setting value of brake duty ratio. The setting deceleration time is too long, confirm its parameters. When overvoltage stall protection enabled Overvoltage stall protection is enabled, when DC bus voltage exceeds DC690V, the output frequency remains unchanged.
When it is lower than the setting value of FC-20, the output frequency drops continuously, therefore the deceleration time is prolonged. The setting deceleration time is too long, please check its parameters. 10.2.5 Inverter Overheating Excessively heavy load Heavy load makes inverter work beyond its rated current for a long time. The power of inverter shall match that of motor. The motor rotor is blocked due to the failure of motor or load fault. Excessively high ambient temperature When the ambient temperature of inverter exceeds the permitted value, the temperature might exceed the permitted highest value of inverter when it works in the rated status.
10.2.6 Electromagnetic Interference (EMI) and Radio-frequency Interference (RFI) When inverter runs in high frequency switch status, it will generate EMI and RFI on the control devices. Take following countermeasures: Lower the carrier frequency (F0-14) of inverter. Install noise filter on input side of inverter. Install noise filter on output side of inverter. Shield cable with a metal tube, and place the inverter in a metal case. Reliable grounding for the inverter and motor. The main circuit and the control circuit should be separated in terms of wiring. Control circuit should take shielded wire, and see Chapter 3 for wiring.
10.2.7 Leakage Current Circuit Breakerfor Leakage Protection When inverter runs, the leakage current circuit breaker is triggered for leakage protection. Since inverter outputs high frequency PWM signal, it will generate high frequency 168