If you want to change the direction of rotation of these machines, you are kindly asked first to check with us fonr.the necessary arrangements. *+
Before starting up, make sure by means of teSt starting that the direction is according to the requirement.
1 2 3 4 5 6
to suppl r control . voltage
to close the mai switch
to short eicuit ste; resistors
f->
to contro contactor
to initial the tripp ing
to open the main switch
41. /55 мин./ Прочтите три отрывка из инструкции,
а) Пользуясь приведенной ниже схемой, объясните условия пуска двигателя /А/.
б) Скажите по-русски, как производится пуск и остановка двигателя/В/.
в) Нарисуйте схему ручного пуска по образцу а)/С/.
A. Slip-Ring Motors. Remote-Controlled Starting.
Flow Chart
The control voltage for the remote-controlled rotor starters is supplied by the main switch either from the motor voltage supply or from a separate control voltage supply. After closing of the main switch, the starting is automatically effected so that the step contactors short circuit step by step the resistors of the starter. The contactors are controlled either by time relays or - under-current relays.
The remote-controlled starters are equipped with a total starting time controller, which initiates tripping of the motor if the starting is not effected within the preset time.
The interlocking connections are such that the main switch does not close if all the step contactors & relays of the starter open & the starter is in the initial position ready for the next starting.
The principle connection diagram of the remote-control is on separate operating instructions supplied with the remote-controlled brush-lifting device.
B. Starting.
The main switch is closed. The step contactors of the starter close automatically in a preset order & time thus short circuiting the resistors of the starter.
The last closing step contactor cuts off the control voltage supply from the total starting time controller, & supplies voltage to the remote-controlled device which lifts the brushes to the “Run”-position. Stopping: The main switch is opened. The relays & contactors of the starter open. The brushes turn automatically to the position of the “Start”. The starter is ready for the next starting.
C. Manual Starting.
The brush-lifting devices & manual starters of the slip-ring motor are equipped with auxiliary contacts in accordance with the connection diagrams. The main switch is interlocked, by using these contacts, with the connection so that the motor does not start unless both the starter & thte brush-lifting devices are in the position corresponding to the starting.
The interlocking connections secure also that the motor stops . if the brush-lifting device is .accidentally turned away from the running position during the operation of the motor.
This protection is effective only if the starter is returned to the initial position in accordance with the starting instructions.
The oil-copied starters are equipped with a thermostat which has a contact which opens at the overtemperature. This contact is to be connected to the control circuit of the main switch so that the main switch trips when the oil temperature reaches the preset value. Presetting is about +85°C... +100°C. Before starting make sure that the starter is in the initial position O, & that the brush-lifting
device, if any, is in the position “Start”.
Ключи
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9 - 2, 3, 6
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16 - 1. Машина позже переведена на более тяжелый режим работы. 2. Чем быстрее движение полюса по.направлению к катушке, тем больше наводимые в ней эдс и ток. 3. Чем длиннее проводники, тем больше сопротивление. 4. Новый метод в два раза производительней старого. 5. Следует позаботиться о том, чтобы упаковка была как можно более однородной.
18 - а) двигатель с /плавно/ регулируемой скоростью, Ь) двигатель переменного тока, с) электродвигатель для бытовых приборов, d) встроенный двигатель, е) приводной двигатель, f) мощный двигатель, g) электродвигатель малой мощности, h) электродвигатель морского исполнения, i) многофазный двигатель, j) двигатель на электростанции, к) гребной двигатель, 1) реверсивный двигатель, т) исполнительный серводвигатель, п) асинхронный двигатель с контактными кольцами, о) двигатель с беличьей клеткой, короткозамкнутый двигатель, р) двигатель тележки /крана/, q) двигатель с воздушным охлаждением, г) без двигателя, s) электродвигатель/с переключением/ на два напряжения;
