aci eRCM Express, Manual

Page: 34 / 97

mCore Firmware Ver 01.10 Ver 2019-Oct-29 Page 34 of 97
If the above holds true, then the unit’s operating conditions have already been prechecked for safety, and unit is
safe to run in these areas.
•
Note: This method is only useful if the eRCM Express unit is set to calculate safe offline operating maps, and
this only happens when EnableSafeOfflinePressRangesCalcs
(ACI_Inputs[62]; Reg#40125)
is set to 1.
o
Before using this mode, make sure that when it is engaged it does not slow down your eRCM Express.
2. Adjustments to PLC Setpoints:
a.
Set the PLC’s Min Allowed Speed to
MinSpeedCurrentLS
b.
Set the PLC’s Max Allowed Speed to
MaxSpeedCurrentLS
c.
Set the PLC’s Min Allowed Suction Pressure to
MinSuctPressureCurrentLS
d.
Set the PLC’s Max Allowed Suction Pressure to
MaxSuctPressureCurrentLS
3. Controls:
a. If there is an active call for More Load (or more Flow),
then the PLC controls changing loading (sample device
preferences given here, but actual device preferences
determined by control logic in the PLC):
i. If Recycle Valve not closed, start to Close Recycle,
then
ii. If available, Unpinch Suction Throttle (up to
MaxSuctPressureCurrentLS), then
1. Ok for flow, use caution with power.
iii. If not at Max Allowed Speed, Increase Speed, then
iv. If NextLoadStepUp

-1, change load step to
NextLoadStepUp.
b. If there is an active call for Less Load (or less Flow), PLC
to change loading:
i. If not at Min Allowed Speed, Decrease Speed, then
Method II – Using Pre-checked Safe Operating Maps
1. IF ( CurrentPs ≥ OfflineMinSafePs1 AND CurentPs ≤ OfflineMaxSafePs1 AND
CurrentPd ≥ OfflineMinSafePd1 AND CurentPd ≤ OfflineMaxSafePd1 ) OR
( CurrentPs ≥ OfflineMinSafePs2 AND CurentPs ≤ OfflineMaxSafePs2 AND
CurrentPd ≥ OfflineMinSafePd2 AND CurentPd ≤ OfflineMaxSafePd2)
THEN Unit is Safe
ELSE Shut Down.