4.2.2 PRESSURE SET UP AND CONTROL
The ISC controls the loading and unloading of air com-
pressors for the purpose of maintaining a steady system
air pressure at the point where the pressure transducer
is installed. The Pressure Set Up and Control Set Points
enable the user to choose the desired air pressure and
to adjust three operating parameters that “tune” the ISC
to best maintain that pressure. The Set Points for control-
ling pressure are:
Pressure Settings (including Target Pressure)
Control Band
Load Delay Time
Unload Delay Time
The Target Pressure in the first Pressure Setting set
point should initially be set to match the pressure pre-
sent at the transducer location prior to starting the ISC. It
can be adjusted later, after confirming proper air system
operation. With the air system operating in typical fash-
ion, press the SEQUENCER STATUS button to read the
pressure currently at the transducer. Watch the pressure
go up and down, noting the maximum and minimum
readings. Use the pressure value midway between these
readings for the Target Pressure in the first Pressure
Setting.
PRESSURE SET UP
The ISC can store up to nine user selected Pressure
Settings. Each Pressure Setting can be given a Target
Pressure, a day of the week and a time of day. At the
instant a Pressure Setting matches the present day and
time, the ISC will begin loading and unloading compres-
sors based on that Pressure Setting’s Target Pressure.
That Target Pressure will remain active until another
Pressure Setting matches another day and time.
This feature enables the system air pressure to be auto-
matically reduced during non-operating hours to save
energy and automatically returned to the operating level
when needed.
An example of a Pressure Setting Set Point is shown in
Figure 6.4. Using the following rules as guidelines,
decide what Pressure Settings are needed and write
them in Figure 6.4. Then perform the steps that follow
these rules to access the Set Points and to enter the
Pressure Settings.
PRESSURE SETTINGS SET UP RULES:
1. Settings are numbered 1 through 9, and any number
of them can be used.
2. Each Setting is enabled by specifying its Target
Pressure, Day of the Week and Time of Day, or it is dis-
abled by specifying it as “UNUSED” in place of selecting
a Target Pressure.
3. Target Pressure can be set to 0 (zero), any value from
30 to 225 PSI (in 1 PSI increments) or UNUSED. A zero
setting will cause the ISC to unload all machines regard-
less of the system pressure.
4. Any Day of the Week designator can be assigned to
any number of Settings. Day of the Week can be any
one of the following choices:
MON Monday
TUE Tuesday
WED Wednesday
THU Thursday
FRI Friday
SAT Saturday
SUN Sunday
DLY Daily - every day of the week
WD Week Day - every day Monday thru
Friday
WE Week End - both Saturday and Sunday
(blank) Fixed Target Pressure - This is available
only in Setting Number 1. When “blank”
is used, the Target Pressure of Setting
Number 1 will be used all the time, and
Setting Numbers 2 thru 9 will not be
available.
5. Any Time of Day can be assigned to any number of
Settings. Each Time of Day can be on any hour or quar-
ter of an hour. Time is entered using the 24-hour clock
method. For example, four-thirty in the afternoon would
be entered as 16:30.
6. In case two or more Pressure Settings have the same
Day of the Week and Time of Day entries, the lower
numbered Setting will have priority.
7. When the ISC leaves the Set Point routine, the
Pressure Setting assigned to the current day and time
“period” will be initiated. This is done by the ISC search-
ing through all the Settings to determine which Setting
(i.e.Target Pressure) is supposed to be currently active.
8. This Pressure Settings feature is independent of the
three modes of sequence rotation. It is active regardless
of whether rotation is under Timed, Event or Manual con-
trol.
Perform the following steps to enter or change Pressure
Settings, or use the Set Point Map (Figure 6.1) as a
quick reference of how to get to the PRESSURE SET
UP Set Points.
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