aci eRCM Express, Manual

Page: 72 / 97

mCore Firmware Ver 01.10 Ver 2019-Oct-29 Page 72 of 97
IF CurrentLoadStep > 0 THEN
IMPLEMENT_LoadStep // Call routine to physically implement current load step
ELSE
MSG “CRITICAL ISSUE: No safe load steps found for Start Up. Shut Down!”
EXIT
END IF
// =======================================
The code below is relevant to AFTER the unit is online.
// =======================================
// Compressor is now online
– Bypass Fully Closed.
// =======================================
// Now, pass data to eRCM, get results back and take actions accordingly
// Pass the current operating data
Modbus.NumberOfDataValues = eRCM_CommonWritesLen
Modbus.Address = eRCM_CommonWritesStart
Modbus.Data(1) =
UnitABC.CurrentLoadStep
Modbus.Data(2) = UnitABC.Stage1.Ps_PSIG
Modbus.Data(3) = UnitABC.Stage2.Pd_PSIG
Modbus.Data(4) = UnitABC.Driver.CurrentRPM
Modbus.Data(5) = UnitABC.Stage1.Ts_F
Modbus.Data(6) = UnitABC.Stage2.Ts_F
Modbus.Data(7) = 0
Modbus.Data(8) = 0
Modbus.Data(9) = 0
Modbus.Data(10) = 0
Modbus.Write()
Modbus.NumberOfDataValues = eRCM_ForceCalcsLen
Modbus.Address = eRCM_ForceCalcsStart
Modbus.Data(1) =
1 // Force a calculation of the compressor model
Modbus.Write()
// Wait for eRCM Express to finish calculation (Choose one of two options)
Sleep 150 ms // May need to be set higher (i.e. 250-350 ms for some models)
// Get results back
Modbus.NumberOfDataValues = eRCM_CommonReadsLen
Modbus.Address = eRCM_CommonReadsStart
Modbus.Read()
UnitABC.NSU = Modbus.ReadData(2)
UnitABC.NSD = Modbus.ReadData(3)
UnitABC.NSU_Perc = Modbus.ReadData(4)
UnitABC.NSD_Perc = Modbus.ReadData(5)
UnitABC.MinSpeedCurrLS = Modbus.ReadData(6)
UnitABC.MaxSpeedCurrLS = Modbus.ReadData(7)
UnitABC.MinPsCurrLS = Modbus.ReadData(8)
UnitABC.MaxPsCurrLS = Modbus.ReadData(9)
UnitABC.OptimalLS = Modbus.ReadData(10)
UnitABC.CurrTorq_Perc = Modbus.ReadData(11)
UnitABC.UnitEff_Perf = Modbus.ReadData(12)