Section 3
SUPERVISOR CONTROLLER SEQUENCING
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in a system, for example, they must be numbered 1, 2 and 3. Up to 16 machines may be
sequenced with the Supervisor Controller.
BAUD RATE - Serial communications baud rate, almost always set to 9600.
LAST COM - Set to total number of machines in a system.
LOWEST - This should be set to the lowest allowable pressure before a machine has to
start. Normally this is 5 to 10 psi (.3 to .7 bar) below the load pressure. If the system pres-
sure drops below this limit then the machine with the lowest SEQ HRS or COM ID is start-
ed immediately. A machine will also start if the pressure is below the Trim Low Setpoint for
a period of time. The length of this time is 0 to 120 seconds depending on the pressure. The
closer the pressure is to LOWEST pressure the shorter the time. For example if the pres-
sure drops below the Trim Low Setpoint by 1 psi (.07 bar), and stays there a machine will
start in 120 seconds. If the pressure drops near LOWEST PRESSURE then a machine will
start in just a few seconds.
RECOVER - Recovery time. This parameter adds a delay between subsequent start, load
and unload commands. See Sequencing Timer Section for further explanation.
ROTATE - Rotate time for two-machine systems. There are some systems where the trim
machine never unloads or stops and the second machine is never required; specifically a
two-machine system where one machine runs all the time and the other is used only for
backup. The rotate parameter forces the trim machine to stop (allowing the other machine
to start). The trim machine will stop when its sequencing hours are more than a stopped
machine sequencing hours by the rotate hours value. WARNING - do not enable this mode
when the above situation is NOT true, because unexpected starts and stops may occur
when manually starting or stopping a machine in the sequence for maintenance.
For example, consider a two-machine system with SEQUENCING hours of 1000 and
ROTATE of 50 hours on each machine. If one machine is started and continuously loaded,
it will run until it's sequence hours are 1050 (50 hours more than the stopped machine) then
stop. The other machine will start and run until it's sequence hours are 1100 (50 more than
the stopped machine) then stop, and so the machine will rotate back and forth every 100
hours.
CAPACITY -The machine capacity may be entered for this value
SEQ HRS - To change this parameter, push the key and change the values as described
above. The maximum value for sequence hours is 100,000. A rollover to zero will occur if
that number is exceeded.
SYSTEM DISPLAY
The SYSTEM menu selection is helpful for trouble-shooting, and calibration. The first col-
umn of the display should show the numbers 1 through the number of machines in the sys-
tem (set by parameter LAST COM). The second column shows the status of each machine.
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