LOW-VOLTAGE SWITCHGEAR AND CONTROLGEAR - PART 5-6: CONTROL CIRCUIT DEVICES AND SWITCHING ELEMENTS - DC INTERFACE FOR PROXIMITY SENSORS AND SWITCHING AMPLIFIERS (NAMUR)
International Electrotechnical Committee
FOREWORD
1 Scope
2 Normative references
3 Definitions
4 Classification
5 Characteristics
5.1 Control input of the switching amplifier
5.2 Interaction between proximity sensor and
switching amplifier
5.3 Continuous characteristic
5.4 Discontinuous characteristic
5.5 Switching current difference
5.6 Line resistance
5.7 Insulation resistance
6 Product information
6.1 Proximity sensors
6.2 Switching amplifiers
7 Normal service, mounting and transport conditions
7.1 Normal service conditions
7.2 Connection identification and marking
7.3 Conditions during transport and storage
7.4 Electromagnetic compatibility (EMC)
8 Constructional and performance requirements
9 Tests
9.1 Switching amplifier
9.2 Proximity sensor
9.3 Results to be obtained
9.4 Verification of the electromagnetic
compatibility
Figure 1 - Example of a continuous characteristic of a
proximity sensor
Figure 2 - Example of a discontinuous characteristic of
a proximity sensor
Figure 3 - Control input of the switching amplifier
Figure 4 - Characteristics of proximity sensor in
the high impedance state
Figure 5 - Characteristics of proximity sensor in the
low impedance state
Table 1 - Classification of proximity switches
Table 2 - Connection and wiring identification
Applicable to proximity sensors connected for operation by a two-wire connecting cable to the control input of a switching amplifier. Contained in the switching amplifier is a d.c. source to supply the control circuit and is controlled by the variable internal resistance of the proximity sensor. In an explosive atmosphere, these devices can be used if they comply also with IEC 60079-11.
| Document Type | Standard |
| Status | Current |
| Publisher | International Electrotechnical Committee |
| Committee | SC 17B |
