The User Manual of JAC200 Series General Frequency Converter
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Service
stage
Safety
level
Matters
Warning
◆
The rotating motor will feed power supply to the frequency converter so
that the frequency converter will be electrified even if the motor is stopped
and the power supply is cut off. Prior to the maintenance of frequency
converter, please ensure that the motor and the frequency converter are
disconnected safely.
1.2 Precautions
1) The requirements for leakage protector RCD
The equipment may bring the large leakage current which flows through the protective grounding
conductor. Please install Type B leakage protector (RCD) in the primary side of the power supply. In
selection of leakage protector (RCD), transient and steady earth leakage current that may occur shall be
taken into account when the equipment is started and operated. Please select the exclusive RCD which
can restrain the higher harmonic or the general RCD with large residual current.
2) Insulation inspection of the motor
The insulation inspection for the motor is required in regular inspection, before reuse after a long time
or for the first use in order to prevent that the frequency converter is damaged due to insulation failure
of motor windings. The motor must be disconnected from the frequency converter in insulation
inspection. It is recommended to adopt 500V megameter and the measured insulation resistance shall
not be less than 5M
Ω
.
3) Thermal protection of the motor
If the motor in use is not matched with the rated capacity of frequency converter, especially when the
rated power of frequency converter is more than the rated power of motor, make sure to adjust the
parameters for motor protection in the frequency converter or additionally mount the thermorelay in
front of the motor to protect the motor.
