5 Installation at Site
23 of 56
Ama-Drainer 80/100
2331.823/07-EN
5.5.2 Setting the switching points for the level control system (for Ama-Drainer ... S
only)
CAUTION
Fluid level below the specified minimum
Damage to the pump set by cavitation!
▷
Never allow the fluid level to drop below the specified minimum.
NOTE
The pump set is switched ON/OFF with the float switch at an UPWARD/
DOWNWARD slant of approximately 40° of the float housing (clearly audible
switching noise in the float housing).
A
B
Fig. 4:
Setting the switching points for the level control system
A Fastening point (example)
B Antikink bush
Level control system for one pump set
General information:
▪
The pump set must stop before the water level falls to the level of the pump
foot's suction openings.
▪
The pump set must start up before the water level reaches the upper edge of the
tank.
▪
The float switch must be able to move freely; it must not rest at the bottom or
bump against anything at the top.
ü
The minimum level of fluid handled is observed. (
1. Choose an appropriate height for attaching the float switch cable.
2. Fasten the float switch cable to the discharge line or another suitable point. The
distance between fastening point (A) and antikink bush (B) must be 100 mm as a
minimum.
Level control system for two pump sets with control unit for dual-pump stations
General information:
▪
When two pump sets are used, Ama-Drainer 80 ... N and two float switches must
be used.
▪
Arrange the two float switches in a cascade. This configuration permits the
following switching functions:
– Alternating start-up of the two pump sets at each switching cycle.
– Additional start-up of the stand-by pump at peak load.
– Start-up of the stand-by pump should the duty pump fail.
▪
The pump set must stop before the water level falls to the level of the pump
foot's suction openings.
▪
The pump set must start up before the water level reaches the upper edge of the
tank.
▪
The float switch must be able to move freely; it must not rest at the bottom or
bump against anything at the top.
Содержание Ama-Drainer 80
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