ACD320user manual
Installation and wiring
EMI issue is mainly toreduce the EMI of inverter.
Methods:
A) Inverter and other equipment shall be well grounded and the grounding resistance shall be
less than 5ohm.
B) Inverter's power cables shall be vertical instead of parallel with the control cables.
C) For the applicationwith strong disturbance, the power cables from the motor to the inverter
shall be shielded and the shielding layer shall be grounded.
D) The cables of disturbed equipment shall be twisted shielded cables and the shielding layer
shall be grounded.
2) Reducing the disturbance to the inverter from other equipment
The relay, contactor or electronic -magnetic braking device will disturb the inverter.
Take the following actions to solve this issue:
A) Install surge suppressing devices to the disturbing device
B) Install filter to the input of the inverter
C) Inverter's control cables shall be shielded and the shielding layer shall be grounded
3)Method to reduce the disturbance fromthe inverter to the equipment
Two kinds of noises, one is the radiation from the inverter itself, and another is the radiation from
the cable between the inverter and the motor. These two kinds of radiations induce the cables of
the equipment and make the equipment work abnormally. Following method can be used:
A) If themeasuring meters, radio equipment and sensors and their signal cables are installed in a
cabinet together with the drive, these equipment cableswill be easily disturbed. Take the actions
below to solve the problem: The equipment and the signal cables should be as far away from the
inverter as possible; Signal cables and power cables shall not be routed in parallel or bound
together; The signal and power cables should be shielded; Install radio noise filter and linear
noise filter at the input and output sides of the inverter.
B) If the external equipment shares a sameAC supply with the inverter, and the above cannot
eliminate the disturbance, then the user should install a linear filter or a radio noise filter.
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