aci eRCM Express, Руководство пользователя

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mCore Firmware Ver 01.10 Ver 2019-Oct-29 Page 30 of 97
1. When the PLC starts, if there is more than one potential eRCM Viewer model within
the eRCM Express, then the PLC needs to make sure that it loads in the correct
eRCM Viewer model.
i. If there is only one (1) eRCM Viewer model, then this step can be skipped.
ii. Otherwise, the best option is to identify which file to load (1 through 9) via
the
SetViewerFile
(ACI_Inputs[50]; REG#40101)
item – see Using Select
Features (Item #1) in this manual.
2. Next, if access to the Discharge Header Pressure (the discharge line pressure the
compressor will compress to
after the bypass valve is closed) is available, then
identification of the best safe load step to configure the unit before closing the bypass
valve (to prevent rod load and/or pin non-reversal issues during Start Up) can be
made. This is done by using the
CheckSafeStartup
(ACI_Inputs[53]; REG#40107)
and
the SafeLoadStepStartup
(ACI_Misc[2]; REG#40329)
registers – see Using Select
Features (Item #6) in this manual.
3. If not set by the PLC, the eRCM Express will use the default values assigned to each
of the following when the eRCM Viewer model was created. If different values are
preferred, set them now.
i. SetMinPercChange (%): Usually 1%-2%.
(ACI_Inputs[58]; REG#40117)
ii. SetMaxPercChange (%): Usually in the 15-20% range. Set lower if engine
cannot handle large step changes in load, set higher if engine can handle larger
step changes in load and those changes are needed in areas of the operating
map.
(ACI_Inputs[59]; REG#40119)
iii. LSSelectionMode : There is a variety of these, and the unit needs to be
reviewed to decide when one (or ones) are best suited for the unit. Units with
automated VVCPs are generally set to specific modes that cannot be changed
via the PLC.
(ACI_Inputs[52]; REG#40105)
i. See Addendum I for more details regarding LS Selection Modes.
4. If desired for an HMI screen, read the Ranges for key items and store them in the
PLC. These do not change until a new eRCM Model is loaded, so this set of registers
does not need to be continually read.
ACI_Ranges[0] to ACI_Ranges[24]; REG#s 43605
through 43647
.
5. Read the following set of items, and store in PLC. These do not change until a new
eRCM Model is loaded, so this set of registers does not need to be continually read.
i.
ACI_Misc[3]; REG#40331
, AuxLoad (HP)
ii.
ACI_Misc[4]; REG#40333
, BHPMax (HP)
iii.
ACI_Misc[6]; REG#40337
, Elevation (ft)