Section 7
COMPRESSOR OPERATION
27
timer will start timing. When the timer expires the
machine will start.
SEQUENCING MODES
The following is a brief description of sequencing
modes. For details seethe Supervisor IISequenc-
ing & Protocol Manual (See Recommended Spare
Parts List).
S DISABLED --- Responds to status and
parameter change messages via the
RS485 network but will not respond to
start, stop, load or unload messages.
S REMOTE --- 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 a re
enabled (start/stop, load/unload, master/
local).
S SLAVE --- Will respond to a ll messages,
but will not start or load unless command-
ed to do so by a message. This mode is
used to controlthe machinefrom amaster
computer.
S HOURS --- Sends status message about
once a second; starts, loads and unloads
machines based on s equencing hours.
S COM ID # --- Sends status message
aboutonceasecond;starts,loadsandun-
loads machines based on machine Com
ID#.
7.5 PURPOSE OF CONTROLS
CONTROL OR INDICATOR PURPOSE
EMERGENCY STOP SWITCH Pushingin this switch, found adjacent tothe Supervi-
sorII, cuts all AC outputs from the latter and de---en-
ergizes the starter. A fault message (E STOP) is dis-
played by the Supervisor II until the button is pulled
out and the “O” pad is depressed.
MINIMUM PRESSURE/CHECK VALVE Maintains a minimum of 60psig(4.2bar) incompres-
sorsump. Valvepistonrestricts receiverairdischarge
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 t he compressor
dischargetemperatureexceeds235_F(113_C).Con-
tinually monitors discharge temperature of the com -
pressor.
PRESSURE RELIEF VALVE Opens sump pressure to the atmosphere if pressure
insidethesumpbecometoohigh.
Operationofthisvalveindicatesthatthepressurereg-
ulator is either faultyorout of adjustment andthatthe
Supervisor II Controller is not offloading due to im-
proper setting or malfunctioning transducers.
SOLENOID VALVE Closestheinletvalveandactivatesblowdownvalveto
ventsumppressuretotheatmosphereduringunload
conditions and shutdowns.
PRESSURE REGULA TOR Controls the intakevalve positiontocontrolcompres-
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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