Section 6
COMPRESSOR OPERATION-
SUPERVISOR II
23
start timing. When the timer expires the machine will
start.
SEQUENCING MODES
The following is a brief description of sequencing
modes. For details see the Supervisor II Sequenc-
ing & Protocol Manual (See Recommended Spare
Parts List).
S DISABLED - Responds to status and pa-
rameter change messages via the RS485
network but will not respond to start, stop,
load or unload messages.
SREMOTE- Responds to status and pa-
rameter change messages but will not re-
spond to start, stop, load or unload mes-
sages. The remote inputs and outputs are
enabled (start/stop, load/unload, master/lo-
cal).
S SLAVE - Will respond to all messages, but
will not start or load unless commanded to
do so by a message. This mode is used to
control the machine from a master comput-
er.
S HOURS - Sends status message about
once a second; starts, loads and unloads
machines based on sequencing hours.
S COM ID # - Sends status message about
once a second; starts, loads and unloads
machines based on machine Com ID#.
6.5 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
EMERGENCY STOP SWITCH Pushing in this switch, found adjacent to the Supervi-
sor, cuts all AC outputs from the latter and de-ener-
gizes the starter. A fault message (E STOP) is dis-
played by the Supervisor until the button is pulled out
and the “O” pad is depressed.
MINIMUM PRESSURE/CHECK VALVE Maintains a minimum of 60 psig (4.2 bar) in compres-
sor sump. Valve piston restricts receiver air discharge
from receiver/sump when pressure falls to 60 psig (4.2
bar). Also incorporated in this valve is a terminal check
valve which prevents line pressure backflow into the
sump during unload conditions and after shutdown.
DISCHARGE TEMPERATURE PROBE Shuts the compressor down when the compressor dis-
charge temperature exceeds 235°F (113°C). Continu-
ally monitors discharge temperature of the compres-
sor.
PRESSURE RELIEF VALVE Opens sump pressure to the atmosphere if pressure
inside the sump become too high.
Operation of this valve indicates that the pressure reg-
ulator is either faulty or out of adjustment and that the
Supervisor II Controller is not offloading due to improp-
er setting or malfunctioning transducers.
SOLENOID VALVE Closes the inlet valve and activates blowdown valve to
vent sump pressure to the atmosphere during unload
conditions and shutdowns.
PRESSURE REGULATOR Controls the intake valve position to control compres-
sor output. The regulator stays closed up to a preset
pressure and then opens to provide a rising control
pressure to the inlet control valve as output pressure
increases.
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