AS NZS IEC 60947.5.6:2015 pdf download.Low-voltage switchgear and controlgear Part 5.6: Control circuit devices and switching elements- DC interface for proximity sensors and switching amplifiers (NAMUR).
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 60079-11:1999, Electrical apparatus for explosive gas atmospheres — Part 11: Intrinsic safety “i” IEC 60947-1:1999, Low-voltage switchgear and controlgear — Part 1. General rules IEC 60947-5-2:1999, Low-voltage switchgear and controlgear — Part 5-2: Control circuit devices and switching elements — Proximity switches
3 Definitions
For the purpose of this International Standard the following definitions apply.
3.1 proximity sensor device which converts the travel of an influencing body relative to it into an output signal NOTE 1 The proximity sensor is preferably contactless (e.g. inductive, capacitive, magnetic, photoelectric). NOTE 2 The proximity sensor may be operated with or without mechanical contact.
3.2 switching amplifier device which converts the signal from the proximity sensor presented at the control input into a binary output signal which may be produced e.g. by an electromagnetic relay or a semiconductor switching element
3.3 control circuit system comprising the proximity sensor, the control input of the switching amplifier and the two-wire connecting cable
3.4 output signal of the proximity sensor output current as a function of the variable internal resistance
3.5 distance/current characteristic of the proximity sensor relationship of the output signal (the current value) in the steady state to the distance of the influencing body relative to the sensor. Both continuous and discontinuous characteristics are permitted (see 5.3 and 5.4, and figures 1 and 2)
3.6 actuating range (M1) range defined by four straight lines in the current-voltage graph of the control input of the switching amplifier to which is assigned a switching function of the switching amplifier. There are three actuating ranges covered by the current-voltage characteristic of the control input (see figure 3, a, b and d)
3.7 slope change in the continuous characteristic of a proximity sensor in the actuating range (Mi) (see figure 1) NOTE The slope can assume different values within the control span.
3.8 maximum-operating frequency of the proximity sensor maximum switching frequency achieved through periodic influencing at which the limits of the actuating range (M1) are reached (see figures 1 and 2)
3.9 switching current difference change in control current within the actuating range (\I) at which the switching amplifier changes its output signal (see figures 1, 2 and 3)
3.10 switching travel difference travel of the influencing body which changes the output signal of the switching amplifier. With a discontinuous characteristic of the proximity sensor, the switching travel difference is identical to the control span s line resistance effective resistance of the two-wire connecting cable between the switching amplifier and the proximity sensor
3.12 insulation resistance effective resistance between the wires of the two-wire cable connecting the switching amplifier to the proximity sensor
3.13 time delay before availability (tv) time between the switching on of the supply voltage and the instant at which the proximity sensor becomes ready to operate correctly
3.14 control span (Es) travel of the influencing body in which the actuating range (M1) is operative. With a discontinuous characteristic, the control span is identical to the switching travel difference (see figures 1 and 2)
4 Classification
Proximity switches are classified according to various general characteristics as shown in table 1. The ability to fulfil the requirements of the present standard is designated by a capital letter N placed in the eighth position.
5 Characteristics
5.1 Control input of the switching amplifier The binary output signal of the switching amplifier shall only change when the operating point of the control circuit is within the relevant actuating range (see figure 3).
5.2 Interaction between proximity sensor and switching amplifier The proximity sensor shall be designed in such a way, that when actuated by the intended influence the current-voltage characteristic reliably reaches the “high impedance” and “low impedance” states. The “high impedance” state is shown in figure 4 and the “low impedance” state in figure 5. NOTE The limits for the permitted characteristic range of the proximity sensor and the switching amplifier have been selected so as to provide a safety margin.
5.3 Continuous characteristic Within the actuating range (Aui): a) the output signal of the proximity sensor shall be adjustable; b) the slope of the characteristic shall be either positive or negative and there shall be no hysteresis (see the example in figure 1).AS NZS IEC 60947.5.6 pdf download.