Emerson Rosemount 3490 Series Reference Manual page 103

Reference Manual
00809-0100-4841
Figure 4-27: Pump 1 is On (Rising Level above 5 m)
F
A. Level in m
B. 8.0 m (P421)
C. 5.0 m (P411)
D. 3.5 m (P422)
E. 2.0 m (P412)
F. Pump 1
G. Pump 2
When the level exceeds 8 m (On Point, P421), relay RL2 is energized to start Pump 2 and
assist Pump 1. Relay RL1 stays energized to keep Pump 1 pumping
Figure 4-28: Pump 1 and Pump 2 are On (Rising Level above 8 m)
F
A. Level in m
B. 8.0 m (P421)
C. 5.0 m (P411)
D. 3.5 m (P422)
E. 2.0 m (P412)
F. Pump 1
G. Pump 2
When the level falls to below 3.5 m (Off point, P422), relay RL2 de-energizes to switch off
Pump 2
Emerson.com/Rosemount
A
B
C
D
E
G
A
B
C
D
E
G
(Figure 4-29).
Getting started
January 2021
(Figure 4-28).
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