Sulzer ABS PC 441 - Max Number Of Pumps Running

81307063I
EN
38
Value
• Sparepumpingoodconditionwhenmainpump/sbreaksdown
• Extendtheserviceintervalsandlowerthemaintenancecosts
• Reducestheriskforoverow!
• Increasedavailability
Pump 1 Pump 2 Pump 3 Pump 4
Start
Sequence
1 2 3
4 5 6 7
8 9 10
11 12 13 14
3. Runtime alternation
Inadditiontoabove,pumpcanbealternateddependentonthereruntime.Atexceededmaximumruntimethe
pumpwillstopandanalternativepumpwillbestarted.Thepumpwillonlystopifthereisatleastonealterna-
tivepumpthatisreadytorun.
3. 4.1 Max number of pumps running
Ifthepipingsystemcannottakethepressurewhenallpumpsarerunningthereisthepossibilitytosetthemax
number of pumps that are allowed to run at the same time. This feature could also be used when there is a
limit for the power load in the station.
Ifmaxnumberofpumpsarerunningthesystemwillnotallowanyotherpumpstostart
Apumpisrunningwhentherelayofthepumpisactivatedorthereisarunconrmationfromthepump.
Ifmaxnumbersofpumpsarerunningandtherunconrmationislostorsomeothererrorsthatblockthepump
occur. The following will happen.
• Alarm for the error will be indicated.
• Thefaultypumpwillbestopped.
• Ifalternationisactive,afteradelayanewpumpwillbestarted.
• Ifalternationisnotactiveanewpumpwillstartatthenextstartlevel.
If Start Level Tracking is activated the pump controller uses the start levels of the pumps to decide which
pumptostart.Thepumpwiththehigheststartlevelexceededhashighestpriorityandwillbestartedrst.
Alternatingpumpshavethesamepriorityandalternateasusual.
Abovecanbeusedifthepumpshavedi󰀨erentcapacitiesandonepumpwithhighcapacityshallpumpaloneat
highpitlevelsandapumpwithlowcapacityatlowerlevels.
Example 1 Startleveltracking=On
Alternation=O󰀨
MaxPumpRunning=1
Startlevelpump1=1.0m
Startlevelpump2=2.0m
Startlevelpump3=3.0m
At level 1.0 m pump 1 start.
At level 2.0 m pump 1 stop and pump 2 starts
At level 3.0 m pump 2 stop and pump 3 starts
Aboveisvalidforpumpsthatemptythepit.Ifthepumpsarellingthepitthefunctionisinverted.
Example 2 Startleveltracking=On.
 MaxPumpRunning=1
Startlevelpump1=1.0mAlternationOn
Startlevelpump2=2.0mAlternationOn
Startlevelpump3=3.0mAlternationO󰀨
Atlevel1.0mpump1orpump2startsdependingofwhichonestartedlastpumpcycle.
At level 2.0 m nothing happens.
At level 3.0 m pump 1 or pump 2 stop (the one running) and pump 3 starts.
Thisexampleshowthepossibilitytohaveanumberofpumpalternatingatlowinowsandtostartapowerful
pumpwhentheinowishigh