CPC MultiFlex PAK, User Manual

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28 • MultiFlex I/O Board Operator’s Guide 026-1712 Rev 3 03-JAN-2008
• ON Delay - The PAK is calling for fan stages
to activate, and PAK is waiting for the ON
Delay time period to elapse before activating
the next fan stage.
• DeadBand - The discharge pressure is within
the setpoint deadband, and therefore the PAK
is neither activating nor deactivating any fan
stages.
• Max Cap - All condenser fans are ON, but
the discharge pressure is still above set point.
In other words, PAK would activate more fan
stages if more were available, but it is oper-
ating at maximum capacity.
• Cond Spray - The condenser spray output is
currently ON, meaning the discharge pres-
sure is currently higher than the condenser
spray set point.
7.3.5. Connected and PAK State
At the very bottom of the PAK Status Screen,
the "Connected" field shows the state of the PAK
application’s "Connected" parameter, thus show-
ing whether the PAK has been enabled for com-
munication. "Connected" means the Connected
parameter is set to Yes; "Not Connected" means
the parameter is set to No.
The "PAK State" field shows whether the
MultiFlex PAK is currently reading as Online or
Offline.
Note that a status of "Connected" in the Con-
nected field does not necessarily mean the PAK
is communicating with the E2 - if the PAK State
reads "Offline,"
7.4. Programming the PAK
using E2
To begin programming a PAK, navigate to
the PAK Status Screen for the board you wish to
program (see
Section 7.3. ). For E2, press
E
to enter the Setup Editor.
Each setup screen contains a number of
fields used to program the PAK or the E2 inter-
face to the PAK. For descriptions of each field,
highlight the field value using the arrow keys,
then press
F (HELP) to read the on-line help.
7.4.1. Screen 1: General
In the General screen, enter a name for the
PAK application, specify the temperature and
pressure units you will be using, and enter the
number of compressors and condenser fans.
7.4.2. Screen 2: Comp Setpts
The Compressor Setpoints screen is where
you must enter the suction pressure setpoint and
deadband, as well as assign each compressor to a
compressor group.
Figure 7-3 - PAK Screen 1: General
Figure 7-4 - PAK Screen 2: Compressor Setpoints