Section 5
SEQUENCING TIMERS
30
Example 3: Recovery Timer - Starting Example (pressure drops below
Lowest Pressure setting)
Machines will start when the system pressure drops below the Lowest Pressure setting, or
when system pressure drops below the load setting for a period of time determined by the
Delayed Start timer. The following example shows operation when the pressure drops below
the Lowest Pressure setting. A later example will show how the Delayed Start timer works
(ie. the pressure is below the Load setting but above the Lowest Pressure setting).
Suppose there are three machines where one is in trim, and two are stopped. The Lowest
Pressure setting is 70 psi.
Machine
Status
1 Stopped
2 Stopped (Next machine in sequence)
3 Trim
If the system pressure drops below the lowest pressure setting (70) the next machine in
sequence (2) will start and trim, the previously trimming machine (3) will go to full load.
Machine
Status
1 Stopped (Next machine in sequence)
2 Trim
3 Full Load
The next machine in sequence will wait for 10 seconds before starting if the pressure stays
below 70. If the pressure goes above 70 the machine will start after the Delayed Start timer
expires (explained later).
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