aci eRCM Express, Manual

Page: 32 / 97

mCore Firmware Ver 01.10 Ver 2019-Oct-29 Page 32 of 97
i. Most all users just need to set this to 100%.
v. Force an eRCM Express calculation by putting the value of 1 into
•
If using Allen-Bradley protocol,
o
Set ACI_PLC_REQ[0] to 1.
▪
ACI_PLC_ACK[0] will go to a 1 when calculations have
started.
▪
ACI_PLC_ACK[1] will go to a 1 when calculations have
finished.
▪
Set ACI_PLC_REQ[0] to 0.
•
If using Modbus protocol: ForceERCMExpressCalculations
(ACI_Inputs[37]; REG#40273 or ACI_Inputs[136]; REG#40075)
.
o
Do not try to retrieve any performance data back from the eRCM
Express until the value in
IsKernelBusy (REG#40275) goes to
zero (0). This item changes to one (1) when eRCM Express starts
the compressor calculations and changes back to a zero (0) when
those calculations are complete. This happens very fast (less than
250 ms for most calls).
▪
NOTE: If polling the IsKernelBusy is not easily
achievable via the PLC or gateway, then next best option
is to just wait about 250 ms after writing the Write data
items. It will generally be finished by then.
vi. When calcualtions are compelte, then read the following items:
==========================================================
i. eRCMExpressWatchdogPulse
(ACI_Control[1]; REG#40277)
ii. NextLoadStepUp
(ACI_Control[2]; REG#40279)
iii. NextLoadStepDown
(ACI_Control[3]; REG#40281)
iv. NextLSUpPercentChange
(ACI_Control[4]; REG#40283)
v. NextLSDownPercentChange
(ACI_Control[5]; REG#40285)
vi. MinSpeedCurrentLS
(ACI_Control[6]; REG#40287)
vii. MaxSpeedCurrentLS
(ACI_Control[7]; REG#40289)
viii. MinSuctPressureCurrentLS
(ACI_Control[8]; REG#40291)
ix. MaxSuctPressureCurrentLS
(ACI_Control[9]; REG#40293)
x. FindOptimalLoadStep
(ACI_Control[10]; REG#40295)
xi. CurrentTorque
(ACI_Control[11]; REG#40297)
xii. IsentropicEfficiency
(ACI_Control[12]; REG#40299)
xiii. Fuel Rate
(ACI_Control[13]; REG#40301)