User Manual
EM303A General Purpose Inverter
127
9.2.7
Leakage Current Circuit Breaker for Leakage Protection
z
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 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.
9.2.8
Mechanical Vibration
z
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 sharp noise
due to the resonance between the fixed frequency of mechanical system and the
carrier frequency of inverter. Adjust the carrier frequency F0-14, and
F7-20~F7-22 of inverter to avoid resonant frequency.
z
The fixed frequency of mechanical system resonates with the output frequency
of inverter.
The fixed frequency of mechanic system resonates with the output frequency of
inverter which will generate mechanical noise. 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.
z
PID Control Oscillation
Improper setting of PID controller’s regulation parameters P, Ti and Td, please
reset PID parameters.
9.2.9
Inverter Stops Output While Motor Runs
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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.
9.2.10
Output Frequency Does Not Output as per the Setting Frequency
z
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.
z
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.
