Question about KitchenAid K5SS Heavy Duty Commercial Stand Mixer
Sometimes can be caused by running too fast on the lower speeds. Should be 13 to 15 revolutions in 15 seconds on speed 1 then a slight increase only on speed 2.
Posted on Nov 07, 2013
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Posted on Jan 02, 2017
I have the same mixer and I believe your problem is the governor that is on the back of the motor. You can figure it out by downloading the repair manual here:http://store.mendingshed.com/kitaidparts.html The manual has all the info you need; including a troubleshooting section. The governor is availible from the the same site here:http://store.mendingshed.com/kagovernor.html What tipped me off on my K5SS was looking at the governor as it ran and I could see it moving back and forth; not steady like it should. Good luck!
Posted on Aug 19, 2007
SOURCE: won't shift speeds
ok so the set-up looks sortof like this (lets hope the formatting of this website/your computer doesn't mess it up...)
/ / \ \ \/ | | ___ /\ | | <B
A is the rivet holding the arm to the plastic body B is the contact with a little tab. C is the copper arm D is the arm's contact
there is a copper arm (C) that has a contact on one end (D). If this contact is ALWAYS open (should only be open when mixer is off) it is either bent (carefully reform) or has come loose at the rivet marked A. On mine, the rivet at postn. A had come loose, i simply rotated it so that the contacts touched and super-glued the copper to the plastic (which should be rivited).
Since the copper was not discolored, I knew that the temps should not be too high for the super glue to handle (not in my opinion anyway).
Posted on Jan 26, 2008
Pull the back off and there will be two screws at the top of the Speed Control Plate and a 3rd screw at the bottom. Tighten the top two screws down. email@example.com. Let me know if it works.
Posted on Mar 21, 2009
Here is how your speed control works:
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.
The control Plate for your mixer is PN
If your not good with tools / meters or tedious repairs do NOT attempt this yourself.
The service manual for your mixer can be found here
Posted on Mar 14, 2010
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