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Managing the Bowl Levels
When one of the two level probes fails to detect the presence of liquid in the bowl, the Fill solenoid valve
is activated to refill the correct level.
The probes relating to each bowl are completely independent, therefore the following situation will occur:
Bowl Level Probe
Safety Probe Input
Bowl Level Probe
Safety Probe Input
Bowl Fill Solenoid
NOTE 1: The level/s refill phase must take place within a maximum time lapse which is controlled by the
(controller (see Alarms chapter).
NOTE 2: The level/s refill phase may only concern one of the two bowls, but it will maintain the same
features.
NOTE 3: It is essential that the safety probes are covered for the bowl/s filling phase to take place.
Safety Probes (only for
In addition to the two level probes relating to the two bowls (see FIGURE 32 through FIGURE 35), the
μZ4LP system also monitors the two 'safety' probes designed to monitor the presence of liquid in the
external tanks.
The monitoring of the probes (covered/uncovered) is only active during the bowl loading phase. It
follows, then, that a lack of liquid in the tanks during the non-loading phases will not be signalled.
If:
Safety probe inputs uncovered when bowl fill solenoids = OFF -
Example of how the safety system works:
Supposing the safety probe is uncovered and the solenoid valve is de-energized. In this case there will be
no signal.
Then the level probe located in the bowl is uncovered. The solenoid valve is enabled to allow the bowl to
fill correctly.
3 seconds after the activation of the solenoid valve, the safety signal is activated as the probe has been
identified as uncovered. The fill solenoid valve is deactivated and the buzzer emits an intermittent signal
lasting 6 seconds.
© 2004-2006, IMI Cornelius Inc.
Bowl Fill Solenoid
Bowl Level Probes Uncovered
FIGURE 34
Bowl Level Probes Covered
FIGURE 35
I
F
G
CE
ROST
Bowl Fill Solenoid
Bowl Fill Solenoids = ON
Bowl Fill Solenoid
Bowl Fill Solenoids = ON
Pre-mix)
ENERIC
- 19 -
Ice Frost Operator's Manual
Bowl Level Probe
Safety Probe Input
Bowl Level Probe
Safety Probe Input
no signal
Publication Number: M620919596OPR
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