1. General Introduction
Digital signals are superimposed on the analog values at thefield or control side and are transferred bi-directionally. Current transferred across the DC/DC converter is repeated at terminals 1 and 2. An open field circuit presents a high input impedance to the control side to allow lead breakage monitoring by control system. If the loop resistance for the digital communication is too low, an internal resistor of 250 Ω between terminals 6 and 8 is available, which may be used as the HART communication resistor. Sockets for the connection of a HART communicator are integrated into the terminals of the device.
2. General Specification for KCD2-SCD-EX1
Model | KCD2-SCD-EX1 |
General specifications | |
Signal type | Analog output |
Functional safety related parameters | |
Safety Integrity Level (SIL) | SIL 2 |
Supply | |
Connection | Power Rail or terminals 9+, 10- |
Rated voltage Ur | 19 ... 30 V DC |
Ripple | ≤10 % |
Rated current Ir | ≤30 mA |
Power dissipation | ≤600 mW |
Power consumption | ≤700 mW |
Input | |
Connection side | control side |
Connection | terminals 5-, 6+ |
Input signal | 4 ... 20 mA limited to approx. 30 mA |
Input voltage | depending on switch configuration open loop voltage of the control system < 23 V open loop voltage of the control system < 27 V |
Voltage drop | depending on switch configuration open loop voltage of the control system < 23 V: approx. 6 V at 20 mA open loop voltage of the control system < 27 V: approx. 10 V at 20 mA |
Input resistance | > 100 k, with field wiring open |
Output | |
Connection side | field side |
Connection | terminals 1+, 2- |
Current | 4 ... 20 mA |
Load | 0 ... 650 |
Voltage | ≥13 V at 20 mA |
Ripple | 20 mV rms |
Transfer characteristics | |
Accuracy | 0.1 % |
Deviation | Deviation |
Influence of ambient temperature | < 2 A/K (0 ... 60 °C (32 ... 140 °F)); < 4 A/K (-20 ... 0 °C (-4 ... 32 °F)) |
Frequency range | field side into the control side: bandwidth with 0.5 Vpp signal 0 ... 3 kHz (-3 dB) control side into the field side: bandwidth with 0.5 Vpp signal 0 ... 3 kHz (-3 dB) |
Rise time | 10 to 90 % ≤100 ms |
Galvanic isolation | |
Input/Output | reinforced insulation acc. to EN 50178, rated insulation voltage 300 Veff |
Input/power supply | reinforced insulation acc. to EN 50178, rated insulation voltage 300 Veff |
Output/power supply | reinforced insulation acc. to EN 50178, rated insulation voltage 300 Veff |
Indicators/settings | |
Display elements | LED |
Control elements | DIP-switch |
Configuration | via DIP switches |
Labeling | space for labeling at the front |
Directive conformity | |
Electromagnetic compatibility | |
Directive 2014/30/EU | EN 61326-1:2013 (industrial locations) |
Conformity | |
Electromagnetic compatibility | NE 21:2006 |
Degree of protection | IEC 60529 |
Ambient conditions | |
Ambient temperature | -20 ... 60 °C (-4 ... 140 °F) |
3. Assembly
4. Connection
