Drum Door Control - Fisher & Paykel DEGX1 Service Manual

3.5.10

Drum Door Control

The drum door is opened and closed by the door
grabber, which is positioned by an actuator driven by a
small DC brush motor.
A mechanical interlock prohibits the drum door from
latching closed if garments get caught in the door
opening. With the door unable to close, the drum will
stall, which will be sensed by the motor control module
and corrective action will occur.
After Start/Pause is pressed when the dryer is waiting
with the drum door open:
1. The lid will lock.
2. The sensor module assumes the drum door is open at "Home" and rotates the drum at 5 RPM in
the drum door close direction. If it is "Home" and the grabber lowered, the door will close at 78
degrees away from "Home". Note: If the door is closed and the grabber lowered, the drum will
simply rotate with a slight rubbing noise of the grabber on the drum.
3. If the motor stalls after the drum has moved at least 42 degrees, a "Clothes Jammed" fault will be
internally flagged and the drum will reverse and the door will open before trying to close again.
After three unsuccessful attempts, the drum door will open, the lid will be unlocked and the
relevant User Warning will occur.
4. At the "Retract Grabber Position", 142 degrees from "Home", the sensor module begins moving
away the grabber.
5. If a fault is detected during the actuator movement, the operation of the actuator will be checked.
The drum will stop and an attempt will be made at moving the actuator back to lower the door
grabber.
6. If a fault is again detected, a maximum of five attempts are made at moving the grabber,
alternating the direction with each attempt, until finally the dryer will display the relevant fault
code and remain in the stationary position with the lid unlocked. If however the actuator is
operated correctly, the grabber is left in the retracted position.
7. When the grabber is confirmed to have retracted, the drum motor is sped up to 47 RPM and the
sensor module will begin or continue the normal drying operation.
When Pause is pressed or the drying is completed:
1. If the drum is rotating in the Close direction, then it will be reversed and the drum speed will be
set at 20 RPM, at which speed the position of the drum is verified using the tacho "Gap" as its
reference. If however the drum was moving in the open direction, its position may have already
being verified at the higher speed, but if not, will be set to slow down to 20 RPM until the position
is verified. If within 40 seconds the sensor module is unable to verify its position, either because
no "Gap" of sufficient arc has been detected or a correct count for a complete revolution of the
drum cannot be obtained, then a fault code will be displayed.
2. Once the position is known, the drum speed begins to slow to 5 RPM. Provided the drum speed
has reduced to at least 18 RPM when the drum position is 132 degrees from the extended door
grabber position (210 degrees from "Home"), the lowering of the grabber begins.
3. As the bridges approach the lowered door grabber, wings on each side of the grabber enter the
bridge channels. If the wings do not enter the channels, the grabber will be unable to open the
drum door (refer to the diagram below).
Door Grabber is lowered against the Wrapper
Reference
Point
14
Dimples