Siemens HydroRanger 200 Manuál s instrukcemi Strana 245

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7ML19981FC01 HydroRanger 200 – INSTRUCTION MANUAL Page 231
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Appendix D: Pump Control
Service Ratio Duty Assist (P111 = 54)
Selects the lead pump based on number of hours each pump has run and the specified
ratios that each pump requires. Multiple pumps can run at one time.
Relay Operation (for P118 = 2)
The setpoints associated with the relays are grouped so they can be redistributed based
on pump RUN time ratios. The next pump to start or stop is the one with the required time
to actual time ratio.
Over time the number of hours demanded of each pump will conform to the ratios
specified. Usually, the ratios are specified in percent values.
To create a grouping of pumps where two pumps make up 50% of the run time and the
third pump makes up the other 50%.
P122 is set to these values:
Service Ratio Duty Backup (P111 = 55)
Selects the lead pump based on number of hours each pump has RUN and the specified
ratios that each pump requires. Only one pump can RUN at a time.
This algorithm is the same as Service Ratio Duty Assist except that it will only RUN one
pump at a time. When the next pump in the sequence starts, the previous pump stops.
Cycle 3 Relays
123
Setpoints
On 3 Off On Off
On 2 On Off Off
On 1 Off Off On
Off 0 Off Off Off
P122 Index Value
125
2 25
350
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