详细说明 标准信号隔离分配器 VariTrans® A 20300 knick

VariTrans® A 20300 Signal doublers with two calibrated switchable outputs in a 6-mm housing, also for applications with high-level output loads.   Product description   Image Typical applications   Facts   Product Line   Dimension drawings   Schematic diagram   Specifications   Downloads

The Task Isolation and transmission of 0(4) ... 20 mA and 0 ... 10 V standard signals in two 0(4) ... 20 mA output channels with galvanic isolation between input, output and power supply. The Problems Measuring and control engineering frequently requires an analog standard signal to be processed at two points, i. e. by two devices, whereby both devices are to recognize the signal. To prevent falsified signals and interaction or even damage, in particular in the event of errors, it makes sense to isolate signals and devices galvanically from one another. The Solution The VariTrans® A 20300 signal doubler is an extremely compact product which allows cost-efficient solutions. Using this unit, input, both outputs and power supply are decoupled from one another (4-port isolation). The Housing Measuring only 6 mm, the ultra-slim, 8-pin modular housing of the VariTrans® A 20300 takes up only a little space on the top-hat rail and, if necessary, can be installed at a later date. The Advantages As a signal doubler: In addition to “doubling” the analog signal, the VariTrans® A 20300 can also convert signals if required. For example, if the signal source has only one voltage output but the installation uses current signals, the signal doubler converts the voltage signal (0 … 10 V) proportionally into the required current signals (0 ... 20 mA or 4 ... 20 mA). An adjustment from “Dead Zero“ (0 ... 20 mA) to “Live Zero“ (4 ... 20 mA ) is also possible. The corresponding input and output signals are calibrated and can be selected using DIP switches with the two outputs being switched over together. For load increase: The VariTrans® A 20300 may also be used when a particularly high output load is required. Standard-signal sources can often drive a load of up to 500 ohms, i. e. supply 10 V at 20 mA. Sometimes certain devices – e. g. actuators – require a higher voltage, i. e. their input resistance is higher. Likewise in this case, the signal doubler can solve the problem: both output signals are now not used separately but are connected in series to form one signal. The available voltage is then doubled allowing an increased load up to 1000 ohms (20 V at 20 mA). Of course, the current which determines the 0/4 to 20 mA signal is not changed. The Technology To implement the high functionality of an A 20300 in the smallest of spaces – in a 6-mm-wide modular housing with correspondingly small volume – a patent-pending circuit design is used. The energy balance (2 active outputs) in particular must be optimized for all operating conditions. An application for patent has been filed for the circuit principles of the VariTrans® A 20300. Like all products in the VariTrans® A 20XXX series, the signal doubler also provides protective separation according to EN 61140 to ensure high-level protection of persons and installations. This is achieved by means of increased insulation in compliance with EN 61010-1. In spite of being only 6 mm wide, the VariTrans® A 20300 makes no compromises regarding its insulation properties.

Application examples

Facts:

Safety in the smallest space 4-port isolation in a 6-mm modular housing Signal doubling combined with signal conversion Load increase up to 1000 ohms possible for inputs with high input impedances Personal protection through protective separation according to EN 61140 Flexible use with DIP switches accessible from the outside Calibrated range selection without complicated adjustments Low-cost solution Only one compact, low-cost device is required instead of 2 conventional isolators International use UL / CSA approvals 5-year warranty

Product line   Devices Input 2 outputs Order no. VariTrans® A 20300 0 ... 20 mA, 0 ... 20 mA, 10 V A 20300 P0 calibrated switching (both 4 ... 20 mA, 4 ... 20 mA, 10 V outputs simultaneously) 0 ... 10 V   Power supply     24 V DC   Accessories       DIN-rail bus connector Power supply routing for 2 A 20XXX P0 isolators each   ZU 0628 IsoPower® A 20900 Power supply 24 V DC, 1 A   A 20900 H4 Power supply unit Power terminal block For connecting the supply voltage to   ZU 0677   DIN-rail bus connectors (ZU 0628 or ZU 0678)

Dimension drawings and terminal assignments

Schematic diagram

Specifications
Input data
Inputs	0 ... 20 mA	Calibrated selection (factory setting 0 ... 20 mA)
	4 ... 20 mA
	0 ... 10 V
Input resistance	Current input:	Voltage drop ≤0.1 V at 20 mA
		(approx. 350 mV during power failure)
	Voltage input:	Approx. 100 kohms
Overload	Current input:	Self-resetting overcurrent protection (PTC characteristic)
	Voltage input:	Voltage limited to 30 V by suppressor diode,
		max. permitted continuous current 3 mA
Output data
Outputs 1 and 2	0 ... 20 mA	Common selection (factory setting 0 ... 20 mA)
	4 ... 20 mA
Load	≤10 V (≤500 ohms at 20 mA), ≤ 20 V (both outputs in series)
Offset	<30 µA
Residual ripple	<10 mVrms (at 500 ohm load)
Cut-off frequency	>100 Hz
Transmission behavior
Gain error1)	<0.2 % meas. val. with direct 1:1 current transmission
	<0.3 % meas. val. with voltage input
Temperature coefficient2)	<0.01 %/K full scale (reference temperature 23 ºC)
Power supply
Power supply	24 V DC (±15 %), approx. 0.6 W
	Power supply can be routed from one device to another via DIN-rail bus connectors.
Isolation
Galvanic isolation	4-port isolation between input, outputs, and power supply
Test voltage	1.5 kV AC, 50 Hz: Power supply against input
	2.5 kV AC, 50 Hz: Outputs against each other and against input / power supply
Working voltage	Up to 300 V accross all circuits with overvoltage category II and pollution degree 2.
(basic insulation)	For applications with high working voltages, you should ensure there is sufficient spacing
	or isolation from neighboring devices and protection against electric shocks.
Protection against	Protective separation as per EN 61140 by reinforced insulation according to EN 61010-1.
electric shock	Working voltage up to 300 V AC/DC across each output and all other circuits with
	overvoltage category II and pollution degree 2.
	For applications with high working voltages, you should ensure there is sufficient spacing
	or isolation from neighboring devices and protection against electric shocks.
Standards and Approvals
EMC3)	Product standard:	EN 61326
	Emitted interference:	Class B
	Immunity to interference:	Industry
Approvals	cURus, File No. E 220033, Standards: UL 508 and CAN/CSA 22.2 No. 14-95
Other data
MTBF4)	Approx. 243 years
Ambient temperature	Operation:	0 ... +55 ºC when mounted in row
	Transport and storage:	–25 ... +85 ºC
Design	Modular housing with screw terminals, 6.2 mm wide,
	see dimension drawing
Protection class	IP 20
Mounting	For 35 mm top-hat rail to EN 60715
Weight	Approx. 50 g
1) Additional error in live-zero operation 20 µA or 10 mV
2) Average TC in specified operating temperature range 0 ºC ... +55 ºC
3) Slight deviations are possible during interference
4) Mean Time Between Failures - MTBF - to EN 61709 (SN 29500). Conditions: stationary operation in well-tended rooms, average     ambient temperature 40 °C, no ventilation, continuous operation