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7. SequerlQc the pullips auto I nati call y ON and OFF, to k4lowing staging or pumps to maijit9in <br />the discharge pressure seLpoial, through the ['it) control of the LEAD VFD. and monitoring <br />the perccol Speed of the LEAD VFD to determine when to STAGE ['11 or STAGE DOWN. <br />R. If the system DEMAND IS INCREASING, causing the LEAD VFD to increase speed to <br />above a progranimablc VaIUC(dciatTTiX72/6 speed), tlicn start a virtual timer which will be <br />reset if the speed over drops to below 92%, When a adjUstabIc time delay ,is set by <br />SCADMI[Mf (&f'aU117 is _S rajaIrtes) has elapsed, COMM011CC Willing ON or OFF the <br />appropriate Pumps to go to the next stage. Each STAGING UP control will have qdjU.'dable <br />timers for the affected pumps to "smooth out" the dynavnic change in pressure conditions <br />during the stage transition. It is the irlterit to have the LEAD VFD okvays be operation in an <br />"cfflcicnt range of Speed" while keeping the disohargo pressure stable under Pill <br />CONTROL, This will also facilitateareduetion in energy costs. <br />9. If the system DEMAND IS DECREASING, cawiing the T.FAD VFD to decrease speed to <br />below a programmable value (dell alt is 751/1* speed), then start a victual timer which will be <br />reset if the speed ever rises above 75% Wficii a adjustable tinic delay ns Sol by <br />SCADAIHMI (jefoult is 5 nkitlirbes) has clapsed, commencu turning ON or OFF the <br />appropriate pumps to go down to the next. stage. Each STAGING DO'kNN control will have <br />adjustable timers for the affected pumps to "smooth out" the dynamic change in pressure <br />conditions during the stage transition. <br />0 <br />Pumps On-lille Maximum pump HP <br />I <br />on -line <br />pumps <br />0 <br />j Lead variable Spec Pamp 200 <br />Lead variable speed putrip. <br />2 100 lip purnp (Pump 5) 300 <br />Lead variable speed purnp 1 <br />3 1 M lip pump (Pump 4) 350 <br />4 Load variable speed pump + <br />200 lip PUrall (PUM2 3) 400 <br />Load vadalltespeed purnp — <br />6 <br />C. HMI Functions <br />15 0 11p purnp (Pump 4) <br />1001-11) pump (Pump 5) <br />Lead variable speed pump 4- <br />100 lip pump (Pump 5) — <br />— 200HP Mann (Puilin 3) <br />450 <br />500 <br />1, Provide entry fields for Operator of all the Booster pump staging firriurs with operator level <br />access control to these parameters. Do not allow out ufrange values to be entered. The PLC <br />logic will Sol these entry limits.. <br />77Y 77 —Santa �Ana 1 � RFP43 7 7-5--70-5----- <br />2 6 <br />