General Sequencing Rules; Changing Sequence Parameters - Sullair SUPERVISOR CONTROLLER Instruction Manual

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, the next machine in sequence will load immediately.
The shorter the recovery time the more responsive the system to load changes.
However, the system would be less energy efficient with shorter recovery times since the
machines may not shut off as often. The more frequently a machine loads the less likely
it is to stay unloaded and shut off after the Unload timer expires. Refer to Section 5 for
details on Recovery Timers.
The RECOVER TIME has a default value of 10 seconds.
adjusted in one second intervals from 2 to 59 seconds.
2.6.1

GENERAL SEQUENCING RULES

The following rules apply to load, unload and start of machines in a sequence. Note that
the terms "highest" and "lowest" refer respectively to machines with the highest and
lowest SEQ HRS or COM ID.
Rule 1. Only the highest loaded machine will trim; the rest will be forced to full load.
Rule 2. The trim machine will unload when the line pressure rises above the Trim High
setpoint.
Rule 3. 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 enough
machines are running and loaded to maintain proper system pressure.
Rule 4. 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 enough
machines are running and loaded to maintain proper system pressure.
Rule 5. The lowest stopped machine will start when the line pressure drops below the
Trim Low setpoint, and after a variable time out period (up to 120 sec.). This
time out is dependent on how far the line pressure is below the Trim Low
setpoint. The farther the line pressure is below the setpoint the shorter the
time to start.
Rule 6. The lowest stopped machine will override the above variable time out feature
and start when the line pressure drops below the Lowest Pressure setpoint,
and after the recovery timer expires.
2.7

CHANGING SEQUENCE PARAMETERS

Supervisor Sequence Parameters
Perform the following steps to change sequence parameter settings using the Supervisor
Controller:
1. Press the Down
2. Press Enter
3. Use the Up
the parameter to be edited.
MULTIPLE CONTROLLERS
arrow key until the SEQUENCING menu is displayed.
.
and Down arrow keys to navigate through the menu selections to
Section 2
SEQUENCING WITH
This parameter may be
7