Sullair Supervisor 2 Deluxe, Operator'S Manual

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6
Section 2
SEQUENCING WITH MULTIPLE SUPERVISOR CONTROLS
machines would load and unload at the same time.
The LOWEST pressure parameter specifies the lowest pressure allowed before immedi-
ately starting a machine. A machine may also be started if the line pressure drops below the
Trim Low setpoint for a period of time.
The RECOVER time is used to keep multiple machines from loading, unloading or starting
at the same time. A timer is reset when a machine loads, unloads or loads after a start.
Decisions to load, unload or start another machine are deferred until the timer reaches the
RECOVER time setpoint. Note that the timer starts when a machine is added or taken away
from the system. If the pressure recovers within the RECOVER time, and then at a later time
the pressure drops below the Trim Low setpoint, another machine will load immediately. The
shorter the recovery time the more responsive the system to load changes, but the less
energy efficient it is because machines may not shut off as often. The more often a machine
loads the less likely it is to stay unloaded and shut off after the Unload timer expires. The
RECOVER TIME has a default value of 10 sec. and may be adjusted from 2 to 59 sec.
In the following discussion 'highest' refers to the machine with the highest SEQ HRS or
COM ID and 'lowest' refers to the machine with the lowest SEQ HRS or COM ID.
The following rules are used to load, unload and start :
1. Only the highest loaded machine will trim; the rest will be forced to full load.
2. The trim machine will unload when the line pressure rises above the Trim High setpoint.
The next highest loaded machine will then become the trim machine. If pressure remains
above the Trim High setpoint, the new Trim machine will unload after Recovery Time
expires. This process will continue until only enough machines are running and loaded to
maintain proper system pressure.
3. The lowest unloaded machine will load (trim) when the line pressure drops below the Trim
Low setpoint. If the pressure remains below the Trim Low setpoint the next Unloaded or
Sequence Stopped machine will load or start after the Recovery Timer expires. This
process will continue until only enough machines are running and loaded to maintain
proper system pressure.
4. The lowest stopped machine will start when the line pressure drops below the Trim Low
set point, and after a variable time out period. This time out is dependent on how far the
line pressure is below the Trim Low set point. The farther below the set point the shorter
the time to start.
5. The lowest stopped machine will override the above variable time out feature and start
when the line pressure drops below the Lowest Pressure set point, and after the recov-
ery timer expires.
2.7 CHANGING SEQUENCE PARAMETERS
2.7.1 FOR SUPERVISOR CONTROLLER:
To change parameters on the Supervisor Controller, push the Down arrow key until
Sequencing menu is displayed. Press Enter . To select a parameter for change, move up
and down the menu with the Up and Down arrow keys. Press Enter to select the