Rotating Pumps By Service Ratio - Siemens HydroRanger 200 HMI Operating Instructions Manual

Rotating pumps by service ratio

Prerequisite: Set pump relays to a service ratio value (
Ratio Duty Assist or Service Ratio Duty Backup).
Parameter
2.8.1.12. Service Ratio
2.8.1.12. Service Ratio
2.8.1.12. Service Ratio
Notes:
• The HydroRanger 200 HMI will not sacrifice other pumping strategies to
ensure that the ratio is held true.
• If the pump relays are set to the same value, then the ratio equals 1:1 and all
pumps are used equally (preset).
When more than one pump is assigned a pump service ratio value (in any time units) and a
pump start is required (
respect to the assigned ratio values) starts.
Conversely, when a pump stop is required (
running hours (as compared to the assigned ratio values) stops.
Page 90 HydroRanger 200 HMI – OPERATING INSTRUCTIONS
Index Value Description
1
2
3
2.8. 1 .5. ON Setpoint
), the pump with the fewest running hours (with
2.8. 1 .6. OFF Setpoint
2.8.1.4. Relay Function
1 These values will start Pump 2 fifty
percent of the time, and Pumps 1 and
2
3 each, twenty-five percent of the
1
time.
), the pump with the most
= Service
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