Products and specifications subject to change without notice.
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Limit Switches – Technical Guide
Rules and regulations
Electrical characteristics
Environmental conditions
Construction
Our detectors are designed to conform to international IEC
recommendations and/or European standards (EN).
Proof that a detector conforms to these standards or recommendations
takes the form of a conformity declaration made by the manufacturer
(drafted as indicated in guidance document ISO/IEC 22 - EN 450-14).
Characteristics in line with the general requirements of standards NFC
63140, IEC 947.5.1 and EN 60947.5.1.
- Leakage paths and air gaps : IEC 664.1 - NFC 20-040.
Our position detectors which comply with IEC 947.5.1 can be fitted to
machine-tools and industrial machines complying with NFC 79130, IEC
204.1, EN60204 or VDE 113.
Temperature limits
When they are used in the temperature range quoted, the mechanical and
electrical characteristics of our position detectors will remain substantially
unchanged. If you intend to use them outside this range, please consult us.
Protective treatment
The treatment given to our position detectors is suitable in the vast
majority of applications.
Parts made of steel are zinc-coated or painted according to their
mechanical function. Further information is available on request.
This treatment allows our detectors to be used under the following
temperature and humidity conditions :
T °C 20 40 50
Relative humidity % 95 80 50
This treatment may thus be suitable for applications in tropical or equatorial
climates where the equipment concerned is in an interior location sheltered
from direct exposure to atmospheric conditions.
Other types of reinforced protection are possible for resistance to very severe
environments.
Please enquire.
Mounting requirements
Electric shock protection.
The user should observe the mounting instructions relating to the mode of
protection against electric shocks defined in the IEC 536.1, EN 60204.1 -
NFC 20030 standards :
Class I : earth circuit link. Protection via differential circuit-breaker.
Class II : double insulation.
Class III : very low safety voltage.
Screw tightening torque :
1 : Actuator tightening 1.2 to 1.5 Nm
Plastic Metal
body body
2 : Head fixing screw 0.7 to 0.8 Nm 0.8 to 1 Nm
3 : Body fixing screw 0.7 to 0.8 Nm 0.8 to 1 Nm
4 : Fixing screw 2 to 2.5 Nm
Adjustment of rotary heads with momentary action to right and left :
For series 83 850, 83 851, 83 861, 83 854, 83 855, 83 863
Degree of protection
Under the IEC 529 or NFC 20010 classification scheme, standards employ
an IP code to define the degree or class of protection which a position
detector provides against access to live components and against the entry
of solid foreign bodies and the entry of water.
Protection equipment provides
against the entry of solid
foreign bodies
0 (not protected)
4 diameter ≥1 mm
5 protected against dust
6 sealed against dust
0 (not protected)
4 splashed water
5 hosed water
6 high-pressure hosed water
7 temporary immersion
8 prolonged immersion
(not protected)
1 mm Ø wire
1 mm Ø wire
1 mm Ø wire
Protection for persons against
access to dangerous parts
Protection equipment provides against the entry of water
1
st
numeral
2
nd
numeral
Assigned working current (Ie):
- the current level adopted as a basis for the operating conditions quoted
for a detector, and for the life tests on it.
Thermal rating (Ith):
- the current the microswitch will withstand when not being operated
electrically, for a temperature rise of not more than 60 °C.
Assigned insulation voltage (Ui):
- the voltage adopted as a reference for the dielectric tests and leakage
paths. It must be equal to or greater than the assigned working voltage.
Categories of use (IEC 947.5.1):
- AC 15 for operating AC solenoids and electromagnets
- DC 13 for operating DC solenoids and electromagnets
Contact element designation
(IEC 947.5.1):
- a letter and number which define the use category and the assigned
working voltage and current
For example, A 300 means : in category AC 15, a maximum working
voltage of 300 V and 6 A at 120 V or 3 A at 240 V.
Contact block electrical wiring diagram
Form Za Form Zb
Both contacts have the The 2 contacts are
same polarity electrically isolated
Positive break contact operation (IEC 947-5-1, chapter 3)
For contacts used in safety applications, limit switches, emergency stop
devices, assurance that opening has occurred is essential (see IEC 204,
EN60204). After each attempt, contact opening is checked by an impulse
voltage test (2500 V).
What is meant by a "position detector" is any device which needs to be
operated by a member which exerts a physical force, in view of :
- either the form which its operating device takes
- or the considerable force needed to operate it
The distinguishing features of position detectors are :
- their high electrical performance capability
- their excellent resistance to accidental impact
- good protection against splashed or dripping water
- a wide range of operating devices to allow the detectors to be
adapted to a vast variety of mechanisms
EC Directives
Our detectors conform to the EC Low Voltage Technical Directive
73/23/EEC and can be used in accordance with the specifications of the
Machinery Directive 89/392/EEC.
Introduction
