45
THE CONVECTION CIRCUIT
ISSUE RESOLUTION
F1: Blower Running
Status Bad
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.
o
208/240
VAC is not present: Correct Line Voltage Wiring going
to Motor Controller.
o
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:
o
Verify Motor spins freely.
1. Motor seized: Replace Motor or correct obstruction.
2. Motor spins freely: Verify Motor Windings.
o
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.
o
If Motor is OK, Replace Motor Controller.
2. “A” is not highlighted.
Check Motor per above steps. If Motor is OK, replace the Controller.
MOTOR WINDING RESISTANCES TABLE
T
O
FROM
DE
SCRIPTION
EXPE
CTED RE
SIS
T
ANCE
Black Red Winding (A-B) 2.0 – 2.6 Ohms
Black White Winding (A-C) 2.0 – 2.6 Ohms
Red White Winding (B-C) 2.0 – 2.6 Ohms
Black, White
or Red
Green Windings to Chassis Open
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