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ST-3050D — PARTS & OPERATION MANUAL — REV. 0 (11/18/02) — PAGE 11
ST-3050D SUBMERSIBLE PUMP — APPLICATION (FLOAT SWITCHES)
Float Switch Theory
There is a tilt-sensitive mercury switch hermetically sealed within
each float. As the liquid level (water) rises or falls, the float changes
its angle until the mercury switch makes (close) or breaks (open)
the circuit.
The length of cord between the float and point of attachment
determines the amount of water to be pumped.
Figure 2. Dual Float Control Switch
Float Switch (Dual)
Float switches (Figure 2) are used for the unattended operation
of the submersible pump. The ST-3050D pump requires the use
of a control box to perform this function. Shown in Figure 2 is an
example of a dual float control switch application.
The Model ST-3050D submersible pump requires one each of
the Model SW-1WOP float type mercury switches. These
switches have a pumping range level between 5.5~18 feet
(1.67~5.5 meters). All float switch connections are bare wire (no
plug). The ST-3050D submersible pump
must use the
CB 200
Control Box
when float switches are required for the job
application. The MCP102/104 control boxes
do not have float
switch capability.
Contact Multiquip sales department to order float switches.
SUBMERSIBLE
PUMP
AC
POWER
INPUT
FLOAT
SWITCH
INPUTS
CONTROL
BOX
AC
POWER
TO
PUMP
EXTERNAL 3-PHASE
(230 OR 460 VOLT)
POWER SOURCE
CIRCUIT
BREAKER
RED
WHITE
BLACK
L1
L2
L3
GREEN
GROUND
PUMP
ON
PUMP
OFF
FLOAT
SWITCHES
LIFTING
ROPE
SUPPORT
PLATFORM
3-INCH
DISCHARGE
HOSE
ON
RESET
MANUAL
OFF
AUTO
CAUTION!
HIGH
VOLTAGE!
CAUTION!
HIGH
VOLTAGE!
CB200