Operating instructions
Magnetic reed switches
BN 20
2.3 Purpose
The magnetic reed switches BN 20 with two contacts are designed to
monitor the position of movable safety guards according to ISO 14119.
The magnetic reed switch is classified as uncoded switchgear
type 3 in accordance with ISO 14119.
Operating instructions. . . . . . . . . . . . .pages 1 to 2
EN
Original
1. About this document
1.1 Function
This operating instructions manual provides all the information required
for the mounting, set-up and commissioning to ensure the safe operation and disassembly of the safety switchgear. The operating instructions must be available in a legible condition and a complete version in
the vicinity of the device.
1.2 Target group: authorised qualified personnel
All operations described in this operating instructions manual must
be carried out by trained specialist personnel, authorised by the plant
operator only.
1.3 Exclusion of liability
For safety reasons, invasive work on the device as well as arbitrary
repairs, conversions and modifications to the device are strictly
forbidden; the manufacturer shall accept no liability for damages
resulting from such invasive work, arbitrary repairs, conversions and/or
modifications to the device.
1.4 General safety instructions
The user must observe the safety instructions in this operating
instructions manual, the country specific installation standards as well
as all prevailing safety regulations and accident prevention rules.
Only the listed magnets may be used for actuation of the magnetic reed
switch. Only these magnets can guarantee flawless function and repeat
accuracy. With suitable evaluation and concealed installation, the
requirements for safety applications up to PL e in accordance with
ISO 13849-1 can be satisfied.
2.4 Technical data
Standards: IEC 60947-5-1
Enclosure: AlSi 12 die-casting, painted
Protection class: IP67 to IEC 60529
Operating principle: magnetic
Cable entry: 2x M16
Connection: screw terminals
Switching voltage: max. 250 VAC/DC
Switching current: max. 3 A
Switching capacity: max. 120 VA/W
Dielectric strength: > 600 VAC (50 Hz)
Actuating speed: max. 18 m/s
Switching frequency: max. 300/s
Switching time “Close”: 0.3 ms … 1.5 ms
Switching time “Open”: max. 0.5 ms
Bounce duration: 0.3 ms … 0.6 ms
Ambient temperature: – 25 °C … + 90 ºC
Mechanical life: 109 operations
Electrical life: 106 … 109 operations, depending on load
Resistance to vibration: 50 g on sine wave oscillation
Switching point accuracy: ± 0.25 mm, T = constant
Resistance to shock: 30 g / 11 ms
Tightening force:
- Cover screws: min. 0.6 Nm
- Cable gland: min. 1.2 Nm
- Blocking screws: min. 1.2 Nm
B
to ISO 13849-1:
10D
- NC contacts (at 20 % contact load): 20,000,000
- NO contacts (at 20 % contact load): 20,000,000
Further technical information can be found in the Schmersal
catalogues or in the online catalogue on the Internet:
www.schmersal.net.
The information contained in this operating instructions manual is
provided without liability and is subject to technical modifications.
3. Mounting
2. Product description
3.1 General mounting instructions
2.1 Ordering code
This operating instructions manual applies to the following types:
BNS 20-➀Z
No. Option Description
01 1 NC
➀
02 2 NC
10 1 NO
20 2 NO
11 1 NC contact / 1 NO contact
R 1 bistable contact
2R 2 bistable contact
11R 2 bistable contact NC / NO
2.2 Special versions
For special versions, which are not listed in the order code below 2.1,
these specifications apply accordingly, provided that they correspond to
x.000 / 08.2018 / v.A. - 103027237-EN / A / 2018-08-22 / AE-Nr. -
the standard version.
Two elongated holes are available for fastening the enclosure.
Any mounting position, provided that the active surfaces are opposite
Magnetic reed switches and actuators
• Do not use as limit stops.
• Do not install in strong magnetic fields.
• Do not install on ferromagnetic material.
• Do not expose to strong vibrations or shocks.
• Inseparably fix to the safety guard.
The use of a protective ground wire is imperative.
Keep away from metal chips
EN
When mounting to protective equipment, the requirements of
standard ISO 14119 must be taken into account.
1
Operating instructions
24 80 120150 220 250 V
Magnetic reed switches
BN 20
3.2 Dimensions
All measurements in mm.
16
M 16x1,5
6,5
7,5
60
75
30
6,5
47
25
10
52
21,5
18
4. Electrical connection
4.1 General information for electrical connection
The electrical connection may only be carried out by
authorised personnel in a de-energised condition.
The contact labelling can be found in the wiring compartment of the
switch. Cable glands (included in delivery) are only authorised for
permanent cables. The constructor must provide for the necessary
strain relief. After wiring, dust and soiling must be removed from the
wiring compartment.
4.2 Contact variants and switch travel
104
In version -10 and -01: When the switches and actuators
come together, the colours must coincide: Red (S) to red (S)
and green (N) to green (N).
4.3 Switching capacity
A
1,3
1,2
1,1
1,0
0,9
0,8
0,7
0,6
0,5
0,4
0,3
0,2
0,1
5. Maintenance
5.1 Maintenance
In case of correct installation in accordance with the instructions
described above, the component requires little maintenance. For use in
extreme conditions, we recommend routine maintenance including the
following steps:
• Check the actuator and the magnetic reed switch for correct seating
• Remove particles of dust and soiling.
• Check that the cable glands are fitted in accordance with the
applicable operating instructions manual
1 NO contact BN 20-10Z
or
1 NC contact BN 20-01Z
with actuating magnet
BP 20
1 bistable contact BN 20-RZ
with actuating magnet
BP 20N
1 bistable contact BN 20-RZ
with actuating magnet
BP 20S
Do not open the device when live.
10
Damaged or defective components must be replaced.
6. Disassembly and disposal
3
+
-
3
17
+
-
17
10
3
+
-
6
3
+
-
6
10
6.1 Disassembly
The switch must be disassembled in a de-energised condition only.
6.2 Disposal
The switch must be disposed of in an appropriate manner in
accordance with the national prescriptions and legislations.
2
3
+
-
6
3
+
-
6
K.A. Schmersal GmbH & Co. KG
Möddinghofe 30, D - 42279 Wuppertal
Postfach 24 02 63, D - 42232 Wuppertal
Phone: +49 - (0)2 02 - 64 74 - 0
Telefax: +49 - (0)2 02 - 64 74 - 1 00
E-Mail: info@schmersal.com
Internet: http://www.schmersal.com
EN
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