Dwyer FSW2 - Manual

When making the connections described above, ensure that the
maximum motor power does not exceed the values indicated on
the level switch. The power supply cable is an important part of the FSW2. Should
the cable appear to be damaged, discontinue use immediately and proceed to
replace the unit. The yellow/green wire found on some units is the ground wire and
must be connected to a suitable ground terminal with the dimension greater than
1mm
2. The terminal used must also be protected against accidental break.
The Series FSW2 Free-Floating Level Switch is a mercury-free self
counterweighted floating switch designed for the automation of pumps, specifically
filling and draining of tanks, wells, and reservoirs. The FSW2 body is free of any
irregularities making it ideal for use in sewage water applications. The
polypropylene body consists of a double airtight chamber with high-pressure melted
polypropylene re-injection sealing to ensure a perfect seal against infiltration. Cable
hangers are available to suit a variety of mounting applications. Featuring CE
approval and optional cables available that include higher chemical compatibility,
high temperature durability, oil resistance, and drinking water suitability. Contact
factory for piggyback plug option, and cable length options ranging from 10 to 70 ft
(3.04 to 21.34 m).
INSTALLATION
The basic operating principle of the FSW2 is very simple. As fluid level rises the
micro-switch located inside the FSW2 is counter-balanced in such a way that it
generates a flipping action in the position of the switch. When fluid level decreases
the float starts in an inverted state then positions correctly. This change in position
generates a signal that can be used to actuate a motor or signal an indicator alarm.
To ensure the proper function of the FSW2, it is necessary to secure the electric
cable inside the tank or well as illustrated in Figure 1. The length of the cable
measured between the fixture point and the body of the FSW2 should be a
minimum of 6 in (15 cm). It is essential to ensure that there are no obstructions in
the FSW2 operational area before operation. During operation, adjustments to
the FSW2 cable must not be made under any circumstances, due to the fact
that any unwanted cable connections made while the FSW2 is immersed in water
can lead to electric shock.
There is a hanging bracket accessory option available (A-459), for wire
arrangement. The bracket allows the cable of the FSW2 to be held in place at the
top of the tank.
Note: The Series FSW2 is self counterweighted and can be used without the need
of additional counterweight, clamp, or bracket. The previous are means to simplify
installation and aid in organizing the use of multiple float switches.
ELECTRICAL CONNECTIONS
The Series FSW2 features a variety of different cable options. One of these options
includes the selection between SPST and SPDT. SPST, single pole single throw,
allows a single operating function with the choice of operation on increasing level
(NC/filling) or operation on decreasing level (NO/ emptying), depending on the
model selection. SPDT, single pole double throw allows for operation of both
increasing and decreasing level, depending on the connections made between the
terminals of the micro-switch and the cable. SPDT, which is a four-conductor cable
(ground option) or a three-conductor cable (without ground option), has one lead
that is common, one that is normally open (NO), and the other that is normally
closed (NC), for the proper connections of these conductors please refer to the
wiring diagrams in Figures 2 to 9.
Series FSW2 Free-Floating Cable Float Switch
Specifications - Installation and Operating Instructions
Bulletin L-FSW2
DWYER INSTRUMENTS, INC.
Phone: 219/879-8000 www.dwyer-inst.com
P.O. BOX 373 • MICHIGAN CITY, INDIANA 46360, U.S.A. Fax: 219/872-9057 e-mail: [email protected]
SPECIFICATIONS
Service: Compatible liquids, slurries.
Wetted Materials:
Housing: Polypropylene;
Cable:
FSW2-XXNX-XX: Neoprene;
FSW2-XXPX-XX: PVC;
FSW2-XXTX-XX: Rubber compound EM7 quality;
FSW2-XXWX-XX: EPDM ethylene propylene;
Operating Temperature: 32 to 122°F (0 to 50°C).
Pressure Limits: 29 psi (2 bar).
Enclosure Rating: IP68.
Switch Type:
FSW2-0XXX-XX: SPST;
FSW2-CXXX-XX: SPST;
FSW2-DXXX-XX: SPDT.
Electrical Rating: 10 (3) A @ 250 VAC.
Mounting Orientation: Vertical.
Shipping Weight:
Housing: 2.4 lb (1100 g);
Cable: 0.77 oz (21.27 g) per foot.
Agency Approval: CE.
4-45/64
[119.50]
4-23/64
[110.83]
8-23/64
[212.50]
5/8
[16.00]
Figure 1: Installation
NOTICE