Motor Winding Resistances Table - TurboChef TORNADO Service Manual

50 THE CONVECTION CIRCUIT
ISSUE
F1: Blower Running
Status Bad

MOTOR WINDING RESISTANCES TABLE

TO
Black
Black
Red
Black, White
or Red
RESOLUTION
1. Verify motor spins freely.
Motor seized: Unplug oven and correct obstruction or replace motor.
Motor spins freely: Verify motor windings (see table below).
2. Verify motor windings are OK. Measure the resistance between
windings and chassis. Unplug oven and replace motor if resistances do
not agree with the values in the table below. If motor is OK, proceed to
step 3, below.
3. Determine if status indicator "A" is highlighted/backlit in
"A" is highlighted/backlit.
a. Disconnect control wiring.
b. Ground OR-9 to chassis to remove backlight on "A".
c. Keeping OR-9 grounded, check terminals on the control wiring
plug for 0-10 VDC control voltage (reference drawing of QC3
plug on schematics (pages 55-63) while incrementing blower
speed in
d. If DC voltage is present throughout all speed settings in
MODE
not, check harness and/or replace I/O board.
FROM DESCRIPTION
Red Winding (A-B)
White Winding (A-C)
White Winding (B-C)
Green Windings to Chassis
(see
TEST MODE BLOWER SPEED
(see , page 15), replace motor controller. If
BLOWER SPEED
EXPECTED RESISTANCE
2.0 – 2.6 Ohms
2.0 – 2.6 Ohms
2.0 – 2.6 Ohms
Open
.
TEST MODE
, page 15).
TEST