The basket idler shaft has a target mounted to the end of the shaft. When the shaft rotates the target rotates as well. This engages a proximity switch that sends signals to the
Safety Rotational Board. If it does not see the target come around in an allotted time, the "
Rotation Failure" error appears.
The rotation prox will make an input on the
BIO1 (Highspeed I/O) and the
Safety Rotational Board. The input on
BIO1 calculates dryer RPM. The input to the
Safety Rotational Board determines if relay
CRRSM is energized.
CRRSM makes the "Dryer is Rotating" input on
BIO1 at
Pin 6.
If a rotation failure occurs, check on reasons the drive shaft may not be rotating. This can result from a number of things including but not limited to:
- Jammed basket
- Bearing failure on the idler shaft causing the prox switch not to sense the target
- Motor failure
- Inverter failure
- Loose rotation target
- Prox switch out of adjustment
- Condensate on the basket drive wheels causing slipping of the wheels on the basket - in this case the dryer blower can be run manually before starting to dry the condensate which usually occurs overnight.
08BNDSRAT - Safety Rotational Board
Schematics
Rotation Prox Location - Rear of Dryer
