Немного оригинального текста из сервисного мануала внизу поста.
Я это понял следующим образом:
На валу есть специальная фигня, которая называется governor assembly, заканчивающаяся маленьким металлическим шариком. Когда вал вращается, эта фигня за счет пружинки отодвигается и нажимает на control plane контакт, при этом размыкается связь между blue и red/white (в обычном состоянии они замкнуты) То есть чем дальше control plane отодвинута механически от вала, тем больше должна быть скорость чтобы governor достал контакт и нажал на него.
Как-то так
вот она:
Поэтому не совсем понятно, что именно и как проверить между blue и red/white
http://www.kitchenaidparts.be/centers/servicemanual/mixer.pdfSpeed Control
The speed control of the mixer is attained through
the use of a governor assembly mounted at the rear
of the control plate assembly.
The electrical circuit is made and broken by the action
of the fly ball governor revolving against the control
plate.
When the switch lever is moved to an ON position,
the position of the control plate with respect to the
governor is changed by the action of the switch lever.
Thus, when the control plate is set close to the
governor, a relatively low speed of the motor causes the
governor to make or break the mixer’s electrical circuit
through the control plate.
When the control plate is set farther away, a greater
motor speed is required before the governor starts
breaking the circuit.
The action of the governor is such that the speed of the
motor will remain constant for a given setting of the
control plate within certain loads.
After certain loads have been exceeded, the speed of the
motor will drop to meet the torque requirements of the
given load.
Speed is controlled by the governor and the control
plate in conjunction with the phase control.
TRIAC RMS VOLTAGE
BOTH CONTACTS OPEN - 40 VOLTS
ONE CONTACT OPEN - 80 VOLTS
BOTH CONTACTS CLOSED - FULL VOLTAGE
NOTE: The triac regulates the power the motor sees
depending on control board contacts.
A device called a triac is a part of the phase control
circuit.
This device determines the amount of power the motor
sees dependent upon the condition of the control board
contacts.
If both contacts are open, about 40 volts RMS is
applied to the motor and about 80 volts is applied when
either contact is closed and the other is open.
When both contacts are closed, the triac is full
on; consequently, full power is applied to the
motor. In this way, the speed is controlled.
If the mixer motor begins to run too fast for a
particular speed setting, one or both contacts
open, which cuts back on the voltage the motor
sees, thus slowing it up.
If the motor operation becomes too slow, one or
both contacts will close, applying the needed
voltage to the motor to sufficiently increase
motor speed.
This is always accomplished through the triac.
The control plate contacts control the triac, and
in turn, controls the amount of power supplied to
the motor.
