Emotron VSB Instruction Manual Chapter 1 Safety Precautions
1.2 Other Considerations
1.2.1 Input Power Supply
This series of drives are not applicable to applications out the range of operating voltage as set
forth in this manual. If necessary, please use booster to rise or drop the voltage to regulated
voltage range.
1.2.2 Surge Protection
This series of drives are furnished with surge suppressor that has certain resistance to lightning
induction. However, users in areas with frequent occurrence of lightning need to mount an
external surge suppressor in front of the drive power input side.
1.2.3 Operation of Contactor
As to the configuration of peripheral devices recommended by this manual, it is necessary to
mount a contactor between the power supply and this drive input side. Such a contactor should
not be used as a control device for start and stop of the drive, as frequent charging &
discharging shall reduce the service life of internal electrolytic capacitors.
When it is necessary to mount a contactor between the drive output and the motor, it
should be ensured the drive is in a non-output status before switch-on/switch-off of such a
contactor. Failure to comply may result in drive damage.
1.2.4 Output Filter
Since the drive output is PWM high frequency chopping voltage, mounting filter devices such
as an output filter and an output AC reactor between the motor and the drive shall effectively
reduce output noise, avoiding interference to other surrounding equipments.
If the length of cable between the drive and the motor exceeds 100m, an output AC reactor
is recommended to use with the purpose of preventing drive fault as a result of overcurrent
caused by excessive distributed capacitance. An output filter is optional depending on field
requirements.
Be sure not to mount phase-shifting capacitor or surge absorber at output side of the drive
since this may result in drive damage as a result of over-temperature.
1.2.5 Insulation of the motor
In view of the fact that the drive output is PWM high frequency chopping voltage accompanied
by higher harmonics, the noise, temperature rise and vibration of the motor is higher compared
with sinusoidal voltage. Particularly this debases motor insulation. Therefore, the motor should
be subjected to insulation inspection before initial use or reuse after being stored for a long
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