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OPERATING INSTRUCTIONS (XE-70M CONTROLLER)
will never start and stop machines, only load and unload
them�� Integral sequencing relies on Auto-Restart to turn
OFF the compressor motor when not needed��
Please note that the compressor's address in the integral
sequencing system is defined by the RS-485 address that
is set on the general settings folder�� Also note that the
pressure signal used to determine when to load or unload
another compressor is based on the pressure reading
from the compressor assigned as the integral sequencing
master�� Lastly, note that the Active Protocol on the
general settings tab must be set to Airbus485 for integral
sequencing to operate properly��
Certain functions may interfere with compressors loading
and unloading:
Verify that the Remote Load Enable switch is in the
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open position�� Having this closed will allow the remote
load/unload switch to define the load command��
Start Delay Interval – Determines the amount of
time between loading compressors�� This prevents all
compressors from loading at once�� This setpoint should
be set to the longest starting time of any compressor in
the system�� In general, this will be equivalent to the star/
delta transition time for a fixed speed machine, or ramp
time for a VSD machine��
Damping – The pressure control "Damping" setting
which is used to tune how quickly the system responds
to pressure deviations�� The default is 10 and should not
normally be changed��
Tolerance - The pressure control "Tolerance" setting,
which is used to tell the system how to respond to
changes in pressure above and below the load/unload
pressures�� The default is 3��0 psi and should not normally
be changed��
Number of Compressors – Defines how many
compressors are in the system�� There is a maximum of 4��
Priority – Each compressor can be assigned a priority
level�� Setting a priority for a compressor affects how
the rotation will occur�� Compressors with priority 1 will
always be in the lead position(s), followed by priority 2
compressors, and so on�� Compressors will only rotate
positions with other compressors of the same priority
level��
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RELEASED 20/Jul/2016 17:56:55 GMT
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Sequence – Displays the current load/unload order of
the system�� Each compressor in the system is assigned
a letter�� The letter indicates whether the machine with
the assigned Airbus address is a lead machine (loads
first, unloads last) or one of the trim machines�� Letter A
is assigned to the lead machine, B to the next machine
to load, C to the third machine to load, and D to the final
machine to load�� Machines will unload in the reverse
order, such that A will be the last machine running��
The first position in the - - - - sequence on Integral
Sequencing tab, page 3 always refers to the compressor
that is assigned Airbus Address 1�� The second position to
Airbus Address 2, and so on�� Note that the letter sequence
may change due to rotation��
Note that the sequence will only be displayed on the
master controller��
Rotate Now – Selecting this setpoint will cause the
sequence to shift according to the priorities, regardless of
the rotation interval setpoint��
Rotation Interval – Determines the time period between
automatic sequence rotations��
Time Left – Counts down the time until the sequence
rotation will occur��
System Pressure – Shows the current pressure reading
that the system is using for control�� This will only be
shown on the sequence Master controller��
All information on these pages is read only��
Some values may only be visible when the factory
settings password is entered��
Page 1 – Analog Inputs
Analog Inputs:
The following analog inputs are displayed in this section��
Package Discharge Pressure – The pressure the
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compressor is delivering to the plant
Sump Pressure – The compressor's internal pressure
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at the sump tank��
STATUS FOLDER
NOTICE
NOTICE
Figure 23 : Analog Inputs
80448418 Rev.C
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