Variable Speed Control; Variable Fan Speed - Electrolux EW30DF65GB Service Manual

VARIABLE SPEED CONTROL

The Variable Speed Control (VSC) board operates the Convection Fan as well as the Oven
LUXURY™
. In the event that either of these features do not operate properly the VSC board should be
lighting
examined as a possible source of failure.

Variable Fan Speed

To achieve optimum cooking results during convection cooking the fan motor speed can be varied.
The EOC will signal the VSC board to speed up or slow down the fan as needed. This speed change
takes place automatically with no action required by the consumer.
The VSC Board is located on the rear of the range
Photo A
as seen in photo A. The board varies the voltage to
the convection fan motor as directed by the EOC to
alter the motor speed. The speed control signal and
the power supply to operate the VSC board come
from the EOC through a wiring harness connected
between P2 on the EOC and P1 on the VSC board.
VSC Board
This harness must be intact and properly connected
for the VSC board to operate. If the harness is
defective or not properly connected the EOC will
display a fault code F23.
When testing the VSC board the power supply from
Photo B P6
the EOC to the board can be verified by measuring
P2
the voltage between pins 1 & 6 (the two outside pins)
Pin 1
on connector P6 of the VSC board. This connector is
not wired in field applications and the pins are easily
accessed to test voltage while the other harness
Pin 6
connectors are in place and power is applied to the
range. Test for approximately 5 volts DC (+/- .5 volt)
on these two pins. If the EOC appears to operate
normally but the voltage to the VSC board is incorrect
or if there is no voltage present inspect and test the
wire harness and connectors between the EOC and
VSC board. If the harness is good then the EOC is
defective and should be replaced.
P1
If the convection fan motor fails to run test for voltage to the convection fan motor. If no voltage is
present then the failure is either in the VSC board, EOC , or the wiring in between. If there is proper
voltage to the fan motor but it does not run then either the motor windings are open or the motor is
stuck. Test the continuity of the motor windings with an ohm meter. There should be approximately
15 ohms of resistance in the convection fan motor windings. If the windings test good inspect the fan
blade and motor shaft to see if the motor will turn. Adjust the fan blade to eliminate binding or replace
the motor assembly if the motor shaft is seized.
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