Operating
7.9 Pump control
HydroRanger 200 HMI
126
Operating Instructions, 06/2018, A5E36281317-AC
7.9.4.2
Rotating pumps by service ratio
Prerequisite: Set pump relays to a service ratio value [(Relay Function (2.8.1.4.) (Page 195)
= Service Ratio Duty Assist or Service Ratio Duty Backup].
Parameter
Index
Value
Description
(Page 200)
1
1
These values will start Pump 2 fifty
percent of the time, and Pumps 1
and 3 each, twenty-five percent of
the time.
(Page 200)
2
2
(Page 200)
3
1
Note
•
The device 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 [ON setpoint (2.8.1.5.) (Page 197)], the pump with the fewest running
hours (with respect to the assigned ratio values) starts. Conversely, when a pump stop is
required [OFF setpoint (2.8.1.6.) (Page 197)], the pump with the most running hours (as
compared to the assigned ratio values) stops.
Summary of Contents for HydroRanger 200 HMI
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Page 24: ...Safety notes HydroRanger 200 HMI 22 Operating Instructions 06 2018 A5E36281317 AC ...
Page 354: ...Updating software HydroRanger 200 HMI 352 Operating Instructions 06 2018 A5E36281317 AC ...
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