User Manual EM303B General Purpose Inverter leakage current. Select a special leakage circuit breaker with a trigger current≥30mA, or a regular leakage circuit breaker with a trigger current≥200mA and the action time ≥0.1S. 10.2.8 Mechanical Vibration The fixed frequency of mechanical system resonates with the carrier frequency of inverter. If there is no problem with the motor, but the machine resonates a sharp noise due to the resonance between the fixed frequency of mechanical system and the carrier frequency of inverter. Please adjust the carrier frequency F0-14, and F7-20~F7-22 of inverter to avoid resonant frequency.
The fixed frequency of mechanical system resonates with the output frequency of inverter. A mechanical noise is generated due to the fixed frequency of mechanic system resonating with the output frequency of inverter. Please use skip frequency F6-16~F6-21 and its range to avoid resonant frequency, or use oscillation suppression function (F9-27), or install the shake-proof rubber on the chassis of motor or any other shake-proof measures. PID Control Oscillation Improper setting of PID controller’s regulation parameters P, Ti and Td, please reset PID parameters. 10.2.9 Inverter Stops Output While Motor Runs Insufficient DC brake at stop DC brake torque at stop is too small.
Please increase setting value of DC brake current at stop (F3-25). DC braking time is too short at stop. Please increase setting value of DC brake time (F3-27). Generally, please increase the DC brake current at stop first. 10.2.10 Output Frequency Does Not Output as per the Setting Frequency The setting frequency is within the range of skip frequency The function of skip frequency is to forbid the inverter to output within the skip frequency range. Please check if the skip frequency of F6-16~F6-21 and its range are proper.
The setting frequency exceeds the upper limit frequency When the setting frequency exceeds the setting value of upper limit frequency, output frequency outputs as per the upper limit frequency. Reset the setting frequency to make it within the range of upper limit frequency, or check whether F0-16 and F0-17 are proper. 169