User Manual
EM303B General Purpose Inverter
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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.
