Top Element Electronic Control System - Electrolux 30" Service Manual

Top Element Electronic Control System:

Some electric range models are equipped with electronic
top element controls, these controls are more accurate
and allow for a lower simmer temperature than the
conventional infinite switches.
CAUTION: ON MODELS WITH ELECTRONIC TOP
ELEMENT CONTROLS, LINE 1 IS CONNECTED TO
THE TOP ELEMENTS WHENEVER ELECTRICAL
POWER IS APPLIED TO THE RANGE.
Components of the system:
The top element electronic control system (engineering
named ESEC 5) is made up of four components;
Potentiometers, User Interface Boards, Mother Board
and Top Elements.
1. Four potentiometers (variable resistors) - one for each
top element, that the user changes the resistance
of when they turn the knob. Because of the different
types of elements two different potentiometers are
used. A potentiometer with a resistance of 20,000
Ohms is used with the single element, and a
potentiometer with a resistance of 10,000 Ohms is
used with the dual and bridge elements. The
potentiometers are identified by the color of their
base. The 20,000 Ohm potentiometer has a gray
base, the 10,000 potentiometer has a black base.
Potentiometer
2. Two user interface boards (UIB) - one for each side
of the range, with four displays, one for each element
that shows the setting of the control. These work
as interfaces between potentiometers and the mother
board.
User Interface Board
3. One mother board - main circuit board that has a
transformer to provide low voltage for the system, a
microprocessor that controls and communicates with
the other components of the system, and relays that
control line to line voltage to the top elements.
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Mother Board