Cart Dispose System Sequence of Operation

Prompts

Dispose to cart sequences are user initiated through the F5 control panel manually. The F5 control system has no provision for automatic prompting of oil dispose sequences. During the on-screen cart dispose control prompts the user is directed to remove the filter pan and then insert the dispose cart. At this time, the filter pan should be removed and dispose cart inserted.

Filter Pan Switch

After the user initiates a cart dispose cycle, the F5 control system first checks to verify the dispose cart is in place. Cart position is confirmed through a circuit from the OMS PCB through a normally open magnetic proximity switch and back to the OMS PCB. A 12 volt DC signal is sent from the OMS PCB to the magnetic proximity switch. With the dispose cart fully inserted, the magnetic proximity switch is actuated closed by the cart's magnet, and the 12 volt DC signal returns to the OMS. If the dispose cart is not fully inserted, the magnetic proximity switch is in its normally open state and the 12 volt DC signal does not return to the OMS. The filter pan switch circuit must be closed before the dispose sequence can progress to the drain step.

• Normally open magnetic proximity switch

• Filter pan switch is actuated closed with dispose cart inserted

Dispose Cart

Collecting drained oil to be disposed is handled by the dispose cart. As oil flows down through the gravity drain system disposed oil is collected for transport by the dispose cart. A manual or electric pump is included with the dispose cart to move disposed oil from the cart to a storage tank. The dispose cart has four wheels which allow it to be transported full or empty as needed.

Selector Valve

Orientation of the selector valve to the vat being disposed occurs as the first dispose action. By first rotating the selector valve to the proper vat position this allows for an oil line purge step later in the dispose sequence. The selector valve is a rotary valve with a fixed body and inner spool that rotates. Rotation and positioning of the selector valve inner spool is provided by a motor/encoder assembly. To rotate the selector valve spool a 24 volt DC signal is sent from the OMS PCB to the selector valve motor. As the selector valve motor rotates, a pulsing 5 volt DC encoder position signal is returned to the OMS. Once the desired selector valve position is confirmed the OMS PCB removes the 24 volt DC signal, and the motor stops rotating. The selector valve motor will rotate in either direction to achieve the desired position with shortest travel. The OMS PCB reverses 24 volt DC rotation signal polarity to change motor direction.

Drain

During the drain stage, a 24 volt DC signal is sent from the OMS PCB to the drain valve actuator which causes the valve to open. With the drain valve open, used oil to be disposed flows by gravity from the vat to the drain trough and then to the dispose cart. A 24 volt DC signal in the opposite polarity is sent from the OMS PCB to the drain valve actuator to close the valve after the Dispose sequence. Mechanical limit switches internal to the drain valve actuator provide position feedback to stop rotation when opening or closing.

• 24 volt DC signal to open drain valve

• Opposite polarity 24 volt DC signal to close drain valve

Purge

Clearing of old oil in the vat's plumbing is performed by the purge stage. The drain valve remains open and while the user is purging oil and a line voltage AC single-phase signal is sent from the OMS PCB to the ATO pump. New cold oil is then drawn from the ATO reservoir (JIB) and is sent through the selector valve return, plumbing lines, and check valve. Once old oil pushed through the lines and new oil enters the vat, the purge pump may be stopped. Excess oil from the purge stage may be directed toward the open drain. After completion of the purge stage, the drain valve will close to allow for filling of the vat with new oil.