aci eRCM Express, Manual

Page: 53 / 97

mCore Firmware Ver 01.10 Ver 2019-Oct-29 Page 53 of 97
AB Tag Register Units Description/Use Common Tag Name
ACI_Misc[0]
40325 %
Returns Minimum Percent of Load (or flow depending on
Load Step Selection Mode) to consider when looking for
Next Step Up or Down.
MinLoadFlowPercChange
ACI_Misc[1]
40327 %
Returns the Maximum Percent of Load Change allowed
when determining Next Step Up or Down.
MaxLoadPercChange
ACI_Misc[2]
40329 #
Use CheckSafeStartup to force a calculation of this
item. If value= -1, then there is no safe load step for
which to start unit.
LStoSetforSU
ACI_Misc[3]
40331 HP
Returns the Auxiliary Load plus any Frame Friction Load.
AuxLoad
ACI_Misc[4]
40333 HP
Returns the driver’s maximum Power.
BHPMax
ACI_Misc[5]
40335 HP
Returns current Max Allowed Load (HP) based on current
torque setting, rated load, current speed and T-Amb (if
engine is ambient rated).
BHPMax at TorqSP
ACI_Misc[6]
40337 ft
Returns the elevation used for compressor modeling.
Elevation
ACI_Misc[7]
40339 psiA
Returns Atmospheric Pressure.
AtmPress
ACI_Misc[8]
40341 #
Returns number of cylinders modeled in the current
model.
NumCyls
ACI_Misc[9]
40343 #
Returns number of load steps defined in the model.
NumLSs
ACI_Misc[10]
40345 #
Returns number of compression stages used in the
current model.
NumStgs
ACI_Misc[11]
40347 #
Returns number of throws modeled in the current model.
NumThrws
ACI_Misc[12]
40349 #
Returns ID Number indicating the OEM of the frame/unit
being modeled. (See eRCM Software for list of OEM IDs.)
OEM ID
ACI_Misc[13]
40351 #
Returns mechanical efficiency used to convert indicated
horsepower to brake horsepower.
MechEff
ACI_Misc[14]
40353 DegF
Returns the average Maximum Discharge Temperature
allowed for all modeled cylinders on the unit.
MaxDischF
ACI_Misc[15]
40355 %
Returns Relative Percent Humidity of Initial Inlet Gas
being modeled, from 0 to 100 (%).
RelHumid
AB Tag Register Units Description/Use Common Tag Name
ACI_ErrorArray
[0..99]
40445…
40643
#, INT
Only read as many as needed. Then look at bits of 32-bit
Integers for specific errors encountered per load step.
Any item with a non-zero value indicates that that load step
is unsafe to use!
ErrorArray()
AB Tag Register Units Description/Use Common Tag Name
ACI_LoadArray
[0..99]
40645…
40843
HP
Only read as many as needed. Then look at values of 32-
bit Floats to see if any are too high (overloaded) or too low
(under loaded) for driver. If any, drop them.
Overloading and underloading are driver (engine/motor)
related issues rather than compressor-related issues. Thus,
if limiting load more than via the Max and Min allowed torque
settings allow, then that will need to be handled via the PLC.
LoadArray()
AB Tag Register Units Description/Use Common Tag Name
ACI_FlowArray
[0..99]
40845…
41043
MMscfd Only read as many as needed. FlowArray()