Belt Sway Switch

FM2035

Application

The Belt Sway Switch functions in detecting any deviation

or sway in the conveyor belt and providing an auto-alarm

and sending out signal to stop the conveyor to avoid the

damage to the conveyor belt and prevent scatter of

conveyed materials because of the belt distortion. The Belt

Sway Switch is necessary in the safe conveying system,

widely used in the belt deviation detection of the belt

conveyor for coal, cement and building materials, mining,

electricity, port, metallurgy and chemical industries.

Operating principle ●The Belt Sway Switch functions in two levels: One for

auto-alarm, and the other for auto-stop.

●During the operation of the belt conveyor, when the belt

sways and touches the vertical roll, the roll turns on its axis;

When the belt sways abnormally, it will squeeze the

vertical roll and make it offset. When the vertical roll is at

20slant, the first level switch function may send the alarm

signal. When it continues to be at 35 slants, the second

level switches function works to send the stop signal.

●After the fault clearing, the belt departs from the vertical

roll and operate normally, the roll may reset automatically.

●The Belt Sway Switch of Fischer is constructed with

high reliability microswitches, lubricateless ball bearings, a

touch roller which is titled to 75 , and other parts; its

functions are designed with a large margin for sure action

and long life

Designation Misalignment Switch Type MF Type

Type of actuation Bidirectional

DIN EN 60204-1

Complies with DIN EN 60947-5-1

EN 620

Mechanics

Enclosure Aluminum ADC-12

Finish RAL5002

Actuating lever Stainless steel; ∅ 60mm, ball-bearded roller

Mounting 2 slotted holes for M8-screws Installation position

Deflection of roller lever Maximum +/-75°

Electric reliability micro switch > 500,000 actuations

Weight 2.2 kg

Electrical System

Switching system 2 changeover contacts (SPDT with snap action);

Switching range 20°…35°

Cable entry Threaded holes M20X1.5

AC-15: 230 V; 1.5 A

Utilization category DC-13: 60 V; 0.5 A

DC-13: 24 V; 2 A

Connection cross section 1 mm2 to 2,5 mm2

Protective conductor connection in the casing; M4; Class I: protective earthling

Rated insulation voltage Ui 250 V

Ambient conditions

Installation ambient temperature – 20C… +50°C

Employ ambient temperature – 20C… +50°C

Protection rating IP65 / IP67

Technology Date

Model Selection

Type Contact Ventilation Order number

configuration temperature range Membrane

SPDT – 40 °C …+70 °C

MF0235 2

MF0235 2

MF0235 2

Spare parts and accessories

Cable gland M25x1,5; sealing area ∅ 11mm to ∅ 16 mm

Name Height Belt Standard

Installation Bracket (Adjustment) H=200mm Belt Wide 650mm, 35°

Installation Bracket (Adjustment) H=260mm Belt Wide 650mm, 45° Belt Wide 800mm, 35°

Installation Bracket (Adjustment) H=325mm Belt Wide 800mm, 45° Belt Wide 1000mm, 35°

Installation Bracket (Adjustment) H=425mm Belt Wide 1000mm, 45° Belt Wide 1200mm, 35°

Installation Bracket (Adjustment) H=525mm Belt Wide 1200mm, 45° Belt Wide 1400mm, 35°

Installation Bracket (Adjustment) H=625mm Belt Wide 1400mm, 45° Belt Wide 1600mm, 35°

Installation Bracket (Adjustment) H=700mm Belt Wide 1600mm, 45°

Installation

●Prevention with slant on both sides of the switch should

be installed on the conveyor maintenance channel,

installation position should ensure that maintenance

personnel in the event of an emergency operation is

convenient

●Switch is located in the conveyor belt on both sides,

vertical roll with conveyor belt edge perpendicular to the

plane, and on both sides of the conveyor belt is located at

1/3 height of vertical roll.

●Switch and vertical roll conveyor belt normal position of

the appropriate spacing is 50 ~ 100 mm.

●Switch quantity should be according to the length of the

conveyor, types and arrangement for sure.

Should be in commonly conveyor head, tail, convex

segmental arc, concave segment and location in the middle

of the conveyor is set.

(Note: when the conveyor is longer, the position in the

middle of the conveyor can every 30~35 m set to 1)

●The partial switch should through the mounting bracket

and conveyor frame connection; switch bracket shall be

installed on the conveyor and conveyor frame welding,

after the completion of switch and switch bracket bolted

Appearance Dimension

Structure

Cable hole

Installation hole

Electric Diagrams

SB1 Stop Button KM EMI contactor E1 pull cord switch.1

SB2 Start Button QS. Air Switch E1 Pull cord switch 2

L1 pull cord switch E1 alarm display FU1 Fuse

L2 pull cord switchE2 alarm display FR thermal relay