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◎A
motor started with soft start can
lower inrush current during the
startup to avoid:
●Sudden
voltage drop on the power network
that might effect normal operation
of facilities powered by electricity
such as blinking of lightings or
interference on electronic
facilities and machines powered by
electricity.
●Demand
charge due to large inrush current
during the startup.
●Impact
on the machines due to rapid startup
of the motor.
●Inertial
impact on the load due to rapid
startup of the motor such as
transported bottles on the conveyer.
●Damage
on the valve due to large imbalance
of the pressure on both sides of the
valve created by rapid startup of
the motor.
◎A
motor stopped with soft stop can
avoid:
●Impact
on the machines run by the motor.
●Inertial
impact on the load due to sudden
stop of the motor such as
transported bottles on the conveyer.
●Water
hammer due to quick stop of the
water pump. Water hammer can create
large noise and damage the water
pipe.
●Damage
on the valve due to large imbalance
of the pressure on both sides of the
valve created by rapid stop of the
motor.
◎Ways
to start a motor:
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●Start
with full voltage
*The inrush current is about
3~9 times of
the rated current. |
●Simple
soft starter
*Current is not constant.
*The current at pick is
still too high
*It can be considered as an
improved
Y-△ starter
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●Good
soft starter
*Starting
current has a limited
current plateau.
*The
current does not reach the
plateau gradually.
*The
adjustability is not good
enough. |
●Best
soft starter –DIGITEK
*Starting current has a
limited current plateau.
*The current reaches the
plateau gradually.
*Has the best adjustability.
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