Siemens 200 Other Pump Controls MR, Service Ratio Duty Backup P111 = 55 MR, Pump by Rate P121 MR

Service Ratio Duty Backup (P111 = 55) [MR 200]

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.

Please note that this feature applies to the MultiRanger 200 only.

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.

First In First Out (FIFO) (P111 = 56) [MR 200]

Selects the lead pump based on the Alternate duty but uses staggered off setpoints and shuts down pumps based on the first in, first out rule.

Please note that this feature applies to the MultiRanger 200 only.

This algorithm starts pumps in the same way as Alternate Duty Assist but uses staggered OFF setpoints to shut the pumps down. When the first OFF setpoint is reached the FIFO rule shuts down the first pump started. If the pumps started in sequence 2,3,1 then they would be shut down in sequence 2,3,1.

Pump by Rate (P121) [MR 200]

Starts pumps until the level is changing at the rate specified in P702 or P703.

Please note that this feature applies to the MultiRanger 200 only.

Pumping costs can be less because only the highest ON setpoint needs to be programmed and this results in a lower difference in head to the next wet well which, in turn, results in less energy being used to pump out the well.

Other Pump Controls [MR 200]

Please note that these features apply to the MultiRanger 200 only.

There are a number of other controls available to modify pump behaviour.

Pump Run-On (P130, P131)

Extends the RUN period for a pump based on a set time interval. This allows for the wet well to be pumped lower than usual and reduces sludge build-up on the well bottom.

Wall Cling Reduction (P136)

Varies the ON and OFF setpoints to keep a fat ring from forming around the walls of the wet well.

Pump Group (P137)

Allows for two different Alternate Duty Assist or Alternate Duty Backup pump groups in the same application.

Appendix D: Pump Control

7ML19981FB06 MultiRanger 100/200 – INSTRUCTION MANUAL Page 243