Section 3
SUPERVISOR CONTROLLER SEQUENCING
17
Philosophy of Sequencing
All Sullair sequencing methods except base-load sequencing and sequencing with a VSD
trim machine work under the same assumption. The most efficient use of compressors is
either fully loaded or not running at all. Therefore, any time more than one machine is run-
ning, all but the last one started is forced to operate at full load. The most recently started
machine is always the trim machine. For applications with a VSD please refer to the sec-
tion entitled "VARIABLE SPEED DRIVE APPLICATIONS".
Modes of Sequencing
REMOTE - Enables three digital inputs for Remote Start/Stop, Unload/Load and Master
Control. These inputs are normally controlled by remote relay contacts or a PLC controller.
A customer may then interface with custom sequencing panels which provide signals for a
2-wire stop/start operation.
SLAVE - Not to be used
SEQUENCE HOURS - In this mode machines are started and loaded depending on the
SEQUENCE HOURS parameter. The sequence hours parameter is similar to run hours
except that it can be changed. Digital inputs for Remote control are disabled. ROTATE
hours are disabled.
COM NUM - In this mode machines are started and loaded depending on the COMMUNI-
CATION NUMBER parameter. Operation is exactly the same as the SEQUENCE HOURS
method (see above) except the communications number is used to determine machine
sequence instead of sequence hours. Digital inputs for Remote control are disabled.
SEQUENCE HOURS with ROTATE Hours Enabled - A special version of SEQUENCE
hours for balancing run hours for use in only two-machine applications that has a demand
for only one machine. DO NOT use with more than two machines (See ROTATE hours
parameter setting for more information). Digital inputs for remote control are disabled.
Remote Enable/Disable Keypad Feature
Another new feature in the Supervisor Controller is a REMOTE keypad on the display mod-
ule that is used to enable and disable the controller from any sequencing mode that is cur-
rently programmed. When the REMOTE key is first pressed after sequencing has been pro-
grammed, it will enable that mode and light the REMOTE LED on the Display Module.
Pressing that keypad again will turn off the LED and disable the sequencing mode. The
compressor will then operate as though it is not in any sequencing mode. The process will
be reversed when the keypad is pressed again.
Remote Control Mode or Digital Inputs For Remote Sequencing
There are three inputs and one output that are enabled in this mode:
Remote Stop/Start Input D5
Remote Load/Unload Input D6
Local/Master Input D7
Local/Master Output K8
D5, D6 and D7 are wired through customer furnished relay contacts to ground (Supervisor
Signal GND). If D5 is grounded, the machine will be enabled to start; if D5 is open the
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