EM330D User Manual
A Special Purpose Inverter for Hoisting
95
The motor rotor is blocked due to the failure of motor or load.
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.
9.2.6
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.
9.2.7
Leakage Current Circuit Breaker for 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 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
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.
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.
