Compressor Sequencing Equipment List - Emerson VILTER MicroVission Operation And Service Manual
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Also See for VILTER MicroVission:
- Operation and service manual (116 pages) ,
- Retrofit manual (20 pages)
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Appendix D • Compressor Sequencing Setup
• The above compressor sequencing settings are in
sync with all connected compressors (in example it is
Comp1 and Comp2).
• Comp1 started in Auto Sequencing mode and Comp2
started in auto sequence standby.
• Both the compressors are waiting for its turn showing
status as green checked mark (i.e. "Ready to Run").
Suction pressure currently = 18 psig, it is below start
offset defined above. The sequencing will start.Comp1
would start in auto sequence and run at minimum step/
load without monitoring start offset condition for start
time period.
Now assume suction pressure currently = 30 psig,
Highest priority compressor (comp1) will start load-
ing according to load offset and load Interval defined
in Compressor Control menu of Comp1. As suction
pressure is above suction pressure control setpoint,
compressor will load fully. Once Comp1 is loaded fully,
Comp2 will get its turn and starts monitoring start pres-
sure against start offset for start time period then starts
running in auto sequencing. Comp2 will load according
to load Interval settings defined in Compressor Control
Menu.
Suction pressure currently = 17 psig, it is less than suc-
tion control setpoint, so program will start unloading
first lowest priority compressor (i.e. Comp2) according
to unload Interval defined in Compressor Control Menu
of Comp2. Once it is unloaded Comp2 will be running at
minimum load, checking for further drop/ rise of suction
pressure. Comp1 will be in fully loaded state.
Suction pressure currently = 12 psig, it is less than stop
offset, so program will start monitoring suction pressure
for stop time period (i.e.10 sec) and once it is elapsed
Comp2 will shut off. It will go in "Auto Seq Standby"
Mode showing status as "Ready to Run". If suction pres-
sure is still below stop offset then Comp1 will not be al-
lowed to STOP as it is the highest priority compressor in
the sequencing. It will be running in Auto sequence with
minimum load.
D − 4
Compressor Sequencing Equipment List
The first page of the Compressor Sequencing menu al-
lows the operator to view and adjust settings that are
used for sequencing the compressors, see Figure D-1.
Equipment
• This label is updated depending on devices shown
in Devices List Page 3. This contains names of all the
compressors in the network communicating with the
compressor. Equipment name will be automatically
updated when new device added from page 3.
Examples of acceptable unique names:
• comp1, comp2, etc.
IP Address
• This label is updated depending on devices shown in
Devices List Page 3. This contains IP Address of all the
compressors in the network communicating with the
compressor. IP Address will be automatically updated
when new device added from page 3 or when new
fresh device is added the sequencing network .
Priority
• Options of this combo box are updated depending on
number of devices shown in Devices List Page 3. This
defines priorities of compressors on the network. This
priority will decide the sequence order in which com-
pressors will be turned on and off during sequence
cycle. The lower the priority number, the greater the
priority of the compressor. Operator should choose
the priorities of the compressors.
Example:
"1" is highest priority.
Compressor with priority "2" has higher priority than
compressor with priority "4".
The operator can configure all settings for a compres-
sor and set the priority to 0, so that it won't be a part of
sequencing steps. If the operator decides to enable this
compressor by setting nonzero, then it will be consid-
ered for the next load / unload cycle.
Setting a compressors priority to 0 while it is running
in auto sequencing mode puts the respective
compressor into local auto mode. This feature
is used to add / remove compressors to/from
sequence table when running in auto sequence
mode. The compressor can be put back into auto
sequence mode for sequencing by pressing Start-
MicroVission Controller • Operation and Service Manual • Emerson • 35391MV 1.3
NOTE
>Auto Seq again on the compressor.
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