ABB TU830V1 After sales service is provided for the control card of the power supply device

Description

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The thermal release TOR, inserted in the delta circuit, can detect any 3rd harmonic
currents, which may occur due to saturation of the magnetic pack and by adding
to the fundamental current, overload the motor without involving the line.
With reference to the connection diagram, the equipment used for a Star/Delta
starter must be able to carry the following currents:
KL line contactor and K∆ delta contactor
KY star contactor
overload protection release
where Ir
is the rated current of the motor.
Starting with autotransformers
Starting with autotransformers is the most functional of the methods used
for reduced voltage starting, but is also the most expensive. The reduction of
the supply voltage is achieved by using a fixed tap autotransformer or a more
expensive multi tap autotransformer.
Applications can be found with squirrel-cage motors which generally have a
power from 50 kW to several hundred kilowatts, and higher power doublecage motors.

This type of starting is used for simple or double-cage rotors. The reduction of
the supply voltage is achieved by the insertion of inductive reactors or resistors,
in series to the stator. On start-up, the current is limited to 2.5÷3.5 times the
rated value.
On starting, the motor is supplied via contactor K2; once the normal speed is
reached, the reactors are short-circuited by the closing of contactor K1, and
are then excluded by the opening of contactor K2.
It is possible to achieve exclusions by step of the resistors or reactors with timedelayed commands, even for motors with power greater than 100 kW.
The use of reactors notably reduces the power factor, while the use of resistors
causes the dissipation of a high power (Joule effect), even if limited to the
starting phase.
For a reduction K (0.6÷0.8) of the motor voltage, the torque is reduced by K2
times (0.36÷0.64).