Motor Winding Resistance Table - TurboChef NGC (Tornado) Service Manual

ISSUE
F1: Blower Running
Status Bad
MOTOR WINDING RESISTANCES TABLE
TO FROM
Black Red
Black White
Red White
Black, White Green
or Red
RESOLUTION
Determine if Status Indicator "A" is highlighted/backlit in Test Mode.
1. "A" is highlighted/backlit.
Verify 208/240 VAC is going to the Motor Controller via Pins 2 and 3.
208/240 VAC is not present: Correct Line Voltage Wiring going
to Motor Controller.
208/240 VAC is present: Verify the control wiring from Motor
Controller and I/O Control Board, specifically Low Voltage Wire
OR-9. If all wires are OK, refer to Motor Controller Trouble
Shooting below.
Motor Controller Trouble Shooting:
Verify Motor spins freely.
1. Motor seized: Replace Motor or correct obstruction.
2. Motor spins freely: Verify Motor Windings.
Verify Motor Windings are OK. Measure the resistance between
windings and chassis. Replace Motor if resistances do not in agree
with the values in the Motor Winding Resistance table below.
If Motor is OK, Replace Motor Controller.
2. "A" is not highlighted.
Check Motor per above steps. If Motor is OK, replace the Controller.
DESCRIPTION
Winding (A-B)
Winding (A-C)
Winding (B-C)
Windings to Chassis
THE CONVECTION CIRCUIT
EXPECTED RESISTANCE
2.0 – 2.6 Ohms
2.0 – 2.6 Ohms
2.0 – 2.6 Ohms
Open
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