Ingersoll Rand R4-11 kW Mode D'emploi page 25

Integral Sequencing allows the compressor to be networked with up to
three other compressors (fixed or variable speed) to maintain a stable
system pressure by loading and unloading compressors as needed. Integral
sequencing requires no additional hardware other than a serial two wire
connection daisy chained between all compressors in the system, connected
to port X04 on the controller.
For a compressor to be a member of the integral sequencing system, the
COM control setpoint in the operator settings tab must be enabled and
the compressor must be started via the local start button. Additionally, it
is recommended that the Auto-Restart function be enabled as the integral
sequencing system 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.
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 open position. Having
this closed will allow the remote load/unload switch to define the load
command.
• The master controller MUST be started and running in the sequence.
Otherwise, compressors will revert to their local setpoints.
• If the master controller is telling a slave controller to load and the slave's
local pressure is above its maximum offline setpoint, or its immediate
stop setpoint, the slave will unload locally, and remain unloaded until
pressure falls below online or target setpoints.
Integral Sequencing – Enabling Integral Sequencing chooses this
compressor to be the sequence Master. The master's package discharge
pressure sensor will be the pressure signal used for the system. The default
is disabled. Make sure all compressors are set up for integral sequencing
before enabling this function. It is important that only one compressor in
the system have this setpoint enabled, otherwise system behaviour could be
impacted. This setpoint should also only be modified while the compressor is
stopped. Note that the Integral Sequencing master does not have to be the
compressor assigned RS-485 address 1.
Unload Pressure – Determines the pressure at which a compressor will be
unloaded by the system. The system unload pressure should always be set
lower than the local offline setpoint of compressors in the system. Note that
when under system control, the compressor will ignore the local pressure
setpoints except for protective functions.
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Load Pressure – Determines the pressure at which a compressor will be
loaded by the system. . The system unload pressure should always be set
lower than the local offline setpoint of compressors in the system. The system
unload pressure should always be set lower than the local offline setpoint
of compressors in the system. Note that when under system control, the
compressor will ignore the local pressure setpoints except for protective
functions.
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.
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 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.
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