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Section 5
OPERATION
5.2 PURPOSE OF CONTROLS (CONTINUED)
CONTROL OR INDICATOR
LINE PRESSURE TRANSDUCER (P2)
BLOWDOWN VALVE
WATER REGULATING VALVE
(water---cooled only)
EMERGENCY STOP SWITCH
5.3 PARAMETER SETUP
Pressing the program key enters parameter dis-
play and edit mode. To move to the next parameter
press the program key. To increment a parameter
press the up arrow key or logo key. The logo key
will increment by 10. To decrement the value press
the down arrow key.
The parameters are displayed in the following or-
der:
S Unload pressure --- The pressure where
the machine is unloaded. For example if
this parameter is set to 110 PSI (7.6 bar)
the machine will unload when the line pres-
sure is above 110 PSI (7.6 bar).
UNLOAD
S Load differential --- The pressure differ-
ential below the unload pressure where the
machine is loaded. For example if the un-
load pressure is set to 110 PSI (7.6 bar)
and the load differential is set to 10 PSID
(0.7 bar), the machine will load when the
line pressure goes below 100 PSI (6.9 bar).
S P1 Max --- Maximum sump pressure. An
alarm and shut down will occur when the
24
100 PSI
LOAD
10 PSI
PURPOSE
Senses service line pressure. When line pressure
reaches maximum setting, the Supervisor signals the
solenoid valve to OFF LOAD the compressor. The
message "ON LOAD" or "OFF LOAD" will be dis-
played to indicate the status of the control. P2 is also
used to calculate separator differential pressure ∆P1.
Vents sump pressure to the atmosphere during un-
load conditions and shutdown.
Regulates the amount of cooling water used in the
cooler to keep the compressor running at a normal
operating temperature.
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.
sump pressure rises above this pressure.
P1 MAX
135 PSI
S Wye to delta transition timer --- For full
voltage starters this parameter is set to 0.
WYE DELT
10 SEC
S Restart time --- Time to wait after powerup
before starting machine. This parameter is
used to keep several machines from start-
ing at the same time after power up, or to
delay start until other equipment is started.
If disabled the machine will not automati-
cally start after power up.
RST TIME
10 SEC
S Unload Stop Timer --- If the machine is
running in AUTO mode, this parameter
specifies the ammount of time that the ma-
chine will run unloaded before shutting off.
If the time is set less than 15 minutes (for
example 5), there may be times when the
machine will run unloaded for more than 5
minutes. This is because there is another
timer that keeps the machine from being
started more than four times an hour.
UNLD TIM
15 MIN
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