Section 5
SEQUENCING TIMERS
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Example 4: Delay Start Timer - Pressure below Sequencing Load pressure
but above Lowest Pressure
The Delayed Start timer comes into play only when the system pressure is below the
Sequencing Load pressure setting but still above the Lowest Pressure setting. This timer
value is prorated between the Sequence Load pressure and Lowest Pressure.
For example if the Load Pressure is 100 and the Lowest Pressure is 70 then:
If System Pressure is above 101 and drops to (and stays at) :
99, machine will start in about 2 minutes.
85 machine will start in about 1 minute.
70 machine will start in about 30 seconds.
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 Sequence Load pressure (102) but is above the
Lowest Pressure (70), the next machine in sequence (2) will start and trim, and the previ-
ously trimming machine (3) will go to full load after the Delay Start timer expires. If the pres-
sure is at 85 then the machine will start in about 1 minute (see table above).
Machine
Status
1 Stopped (Next machine in sequence)
2 Trim
3 Full Load
If the system pressure stays below the Sequence Load pressure then the next machine in
sequence (1) will start after the Delay Start timer expires. If the pressure is at 85 then the
machine will start in about 1 minute (see table above).
Machine
Status
1 Trim
2 Full Load
3 Full Load
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