Fresh Water System
The fresh water system is used at two different times. During operation, the small
tank can be emptied into the large tank after it is full. This would leave the small canister
completely empty and unable to be used again. To prepare the small canister for use,
we restore the prefill amount to the small canister. The prefill pump injects the prefill
(taken from the prefill tank) back into the small canister. The prefill tank holds enough
fluid for 3 prefills and once empty will require a docking cycle to refill the tank.
During the docking sequence, the fresh water system uses two solenoids to
direct the water flow to either the small or large canister. The fresh water tubing for the
large canister runs directly to the large canister cap. When the small canister is
selected, water enters the small canister via the prefill tank. The water fills the prefill
tank first to ensure that it is full, and then overflows from the top of the tank through
another hose that is connected to the small canister cap. Because a 120 VAC input is
required, the prefill pump will not run unless the rover is plugged in.
Coupling Block
Fluid Diverter
Assembly
Prefill Tank Small Canister
Large
Canister
+12VDC
Prefill Pump
+120 VAC
5-6
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