General Information - KitchenAid KSM75 Service Manual

Stand Mixer Service Manual LIT4177310-C

GENERAL INFORMATION

Normal Performance
The KitchenAid Stand Mixer is powered with a
universal motor which will operate on 50 or 60 hertz,
alternating current only.
The Voltage of the power supply should be within 10
volts either way of the voltage stamped on the mixer
trimband and nameplate.
A mixer in good running condition will start turning
slowly when the switch lever is moved from the "OFF"
position to the "STIR" position.
As the switch lever is moved to successively higher
positions, the speed of the beater increases until the #10
speed is reached.
At stir position, the planetary should turn at
approximately 60 RPM; at the #10 position all models
turn at approximately 255 RPM, with the exception of
K45SS models built before May 6th, 2002 (WM19),
which turn at approximately 280 RPM.
KITCHENAID STAND MIXER RPM
SPEED *K45SS
STIR 60 RPM
#10 255 RPM
,
Prior to May 6th, 2002
#10 280 RPM
*Note: All models have similar RPM, except K45SS
units built before May 6
in the #10 position.
The mixer will run quietly in the lower speed range;
however, some noise can be expected on the higher speed
settings due to hum of gears and the motor.
When the mixer is first turned to the stir position, there
may be a slight clattering, irregular noise. This noise will
disappear as the lubrication in the gearcase warms up.
The switch lever should move freely with the "feel" of
definite positions for speed numbers stir, 2, 4, 6, 8 and 10.
Speed numbers 3, 5, 7 and 9 do not have definite notches.
Power
A mixer will have full power on all speed settings. To
check for full power, carefully hold the planetary with
one hand and move the switch lever on and off with the
other hand.
At the stir position, it should not be possible to stall the
planetary except by a very great effort; nor should the
planetary slow down noticeably when the retarding
pressure is applied.
KITCHENAID
OTHER MODELS
60 RPM
255 RPM
th
, 2002, which run at 280 RPM
Heating
Under normal conditions, the mixer will not show
any tendency to heat because of the built-in
ventilating system in the motor.
Under heavy loads with extended mixing time
periods, the head may heat up to the point of being
uncomfortable to touch
Speed 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.
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2005 KitchenAid
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