SEL EX

Features

KIEPE belt misalignment switches type SEL EX are used to monitor the misalignment of conveyor belt systems in accordance with the requirements of EN 620. They are used to protect the system from damage or destruction in the event of belt misalignment and are installed in pairs on both sides of the upper or lower run in areas at risk. The ball-bearing roller lever made of alloy steel and with a large roller diameter is resistant to wear that occurs when the moving belt touches the roller.The KIEPE misalignment switches Type SEL EX are suited for use in explosive atmosphere with conductive dust, Group II, category 2 , in zone 21 and 22 (Type SEL EX 2D) or categorie 3, only in zone 22 (Type SEL EX 3D).The Kiepe misalignment switch Type SEL EX complies with the ATEX Directive 2014/34/EU and meets the safety objectives of the Low Vol-tage Directive 2014/35/EU and IECEx.KIEPE Misalignment switch Type SEL EX features a robust cast iron housing and is equipped with up to 4 force-actuated changeover contacts with snap-action function with two settable switching points.

Note: The misalignment switch must only be used in electrical control circuits.

Corrosive

Powder
Gravel
Rubble

Non-Corrosive

Powder
Gravel
Rubble

The misalignment switch type SEL EX switches when the actuating roller is approached and deflected by the misaligned conveyor belt in the direction of rotation of the roller lever. The stainless steel roller lever is mounted on ball bearings, making it better able to absorb lateral forces and impacts. The switching angle can be set for each switching contact using an adjustable roller. In addition to the safety cut-out, this also enables an advance warning to be realized. When the belt is running correctly, the roller lever resets itself automatically.

Designation	Misalignment Switch Type SEL EX
Type of actuation	Bidirectional (double-side) via roller lever
Complies with	EN 60947-5-1; EN 60079-31; (EN IEC 60079-0)
Suited for	Control units in accordance with DIN EN 60204-1

General

Device group / device category	II / 2D, 3D; flammable, conductive dust
Type of protection	Protection through housing
for Zone 21, 22 SEL EX II 2D	II 2D Ex tb IIIC T85°C Db IP67
for Zone 22 SEL EX II 3D	II 3D Ex tc IIIC T85°C Dc IP67
Certificates	EPS 12 ATEX 1 479 X, IECEx EPS 14.0040X

ATEX/IECEx

Enclosure	Cast iron
Coating	PU 2K-paint; Enclosure – yellow (RAL 1004), release lever – red (RAL 3000), reset lever – blue (RAL 5010)
Actuating lever	Stainless steel; ∅ 50 mm, ball-beared roller
Deflection of roller lever (max.)	+/- 75°
Mounting	2 x M10
Weight	4.5 kg

Mechanics

Switching system (max.)	4 SPDT (snap action) positive-opening switches
Switching range	2x 12,5°, adjustable +/-10° 2x 18°, fix
Cable entry (included in scope of delivery)	2 x M25 x 1,5 with red transport lock 1x screwed cable gland: sealing area ∅ 10 mm to ∅ 17 mm; 1x dummy screw
Utilization category	AC-15: 230V ; 1,5A DC-13: 60V; 0,5A DC-13: 24V; 2A
Connection cross section (max.)	2,5 mm2
Protective conductor connection	Protection Class I / protective earthing
Potential equalization connection	Enclosure / Cover
Rated insulation voltage Ui	250 V
Rated impulse withstand voltage Uimp	2,5 kV, Overvoltage category II, degree of polution 3
Conventional thermal current Ith	6A

Electrical system

Permissible ambient temperature	–25 °C …+60 °C
Protection rating (according to EN 60529)	IP65 / IP67

Ambient conditions according to DIN EN 60947-5-5

Contact reliability at AC-15 230V, 1.5 A	>30.000 operations at 100% Ie

Reliability

The misalignment switch type SEL EX 1 is fastened to a substructure in the installation position with 2 M10 screws each. In the event of misalignment, the belt 2 must not leave the guide rollers. The actuating roller of the roller lever should preferably be approached vertically by the belt 2 in the event of misalignment. During normal operation, the actuating roller of the misalignment switch is not touched. The roller lever is replaceable and can be variable fixed on the switch axis. The electrical connection is made when the device is open via the cable gland included in the scope of delivery directly to the connection glands of the switching elements.

Note: For protection against electrostatic discharge SEL EX is provided with conductive compounds and external potential equalization connections, to which a minimum of 4 mm2 potential equalization cable must be connected directly to the system. All connections must be checked regularly in accordance with the operation instructions.