Tub Home Sensor; Touch Switches; Motor; Rotor - Fisher & Paykel DishDrawer DD24D Series Service Manual

599735A
3.1.1

Tub Home Sensor

The tub home sensor determines when the tub is closed. The tub home sensor consists of an
infrared sender and receiver mounted on the right side of electronic controller. When the tub is
fully closed, infrared light is transmitted from the sender through a light pipe on the side of the tub,
through a prism mounted in the chassis trim, then back through the other light pipe to the receiver.
If the tub is not fully closed, the circuit is not complete and the appliance will not operate.
3.1.2

Touch Switches

Two touch switches are used on the secondary control panel. The one on the left is used to select
the required wash cycle and the one on the right is used to turn the ECO option on or off. (ECO
times are not necessarily shorter than non-ECO times, but will use less energy.)
capacitive touch switches and are supplied with an analogue signal from the controller that will
change in the presence of an earthed mass (i.e. customer's finger).
3.2

Motor

The motor is a fully electronically controlled 80V, 60w, 3 phase, 6 pole brushless DC motor,
running on wash at between 2300-2850rpm depending on the cycle selected, and at approximately
4200 rpm on drain.
3.2.1

Rotor

The rotor is a four-pole permanent magnet rotor with a graphite bearing at each end of the vertical
shaft. At the lower end of the rotor shaft is the drain impellor and at the upper end is the wash
impellor.
The rotor can only be placed in one position within the motor housing (refer to Section 8.14 for
fitting instructions).
3.2.2

Spray Arm

The spray arm is shaped for most efficient water flow.
penetration into the wash load, with the water jets angled to ensure the spray arm rotates at the
most efficient speed. The pressure of the water being pumped from the spray arm produces
enough downwards pressure to ensure the spray arm does not lift off the rotor. There is a flap
valve moulded into the top of the spray arm. This lets air escape through the spray arm when the
DishDrawer™ is filling with water.
3.3

Wiring Cover

The wiring cover protects the customer from all electrical components in the motor area
underneath the tub. All electrical components, regardless of voltage, should be treated as live with
respect to earth. It also serves to protect the motor assembly, drain and fill hoses from damage
when opening and closing the drawers. The wiring cover acts as a cosmetic part of the product.
The centre of the cover is made from rubber to prevent the transmission of noise from the motor to
other components.
3.4

Lid System

3.4.1

Lid Operation

The lid is a single piece of polymer plastic with a diaphragm/seal co-injection moulded into it. The
centre of the lid can move relative to the seal. Each side of the lid is clipped into a yoke, which is
in turn connected to a worm drive lid actuator assembly containing a small brushed DC 24 volt
motor.
When the product is first plugged in and switched on at the wall, the lid motors are powered up to
ensure that the lid is fully raised. At the beginning of each wash cycle, both lid motors are powered
up to pull the lid down onto the tub in approximately 2 to 3 seconds. The lid remains down for the
duration of the cycle and is only lifted when the DishDrawer™ beeps to signal the end of the cycle,
or if the customer pauses it to gain access to the tub.
The holes are positioned for best
16
They are