NoVus TxIsoLoop 1 Loop Powered Isolators User Guide
- September 6, 2024
- Novus
Table of Contents
NoVus TxIsoLoop 1 Loop Powered Isolators
Product Usage Instructions
Electrical Installation
Electrical Connections
Follow the wiring diagram provided in the manual to make proper electrical
connections.
Active Current Signal
If using an active current signal, ensure proper setup and calibration
according to the device specifications.
Installation Recommendations
Follow the installation recommendations provided to ensure optimal performance
and safety.
Mechanical Installation
Mount the isolator securely in a suitable location following the mechanical
installation guidelines provided in the manual.
Warranty
Refer to the warranty section in the manual for information on warranty
coverage and terms.
FAQ (Frequently Asked Questions)
Q: What should I do if I encounter an electrical issue after
installation?
A: If you encounter any electrical issues after installation,first ensure
that all connections are secure and correct. If problems persist, refer to the
troubleshooting section of the manual or contact customer support for
assistance.
Q: Can the isolator be used in outdoor environments?
A: The work environment specifications provided in the manual will
indicate whether the isolator is suitable for outdoor use.
Always adhere to the specified environmental conditions for optimal
performance and longevity of the product.
TxIsoLoop-1
TxIsoLoop-2
Loop-Powered Isolators
USER GUIDE – V1.0x I
SAFETY ALERTS
The symbols below are used in the device and throughout this manual to draw the user’s attention to valuable information related to device safety and use.
All safety recommendations appearing in this manual must be followed to ensure personal safety and prevent damage to the instrument or system. If the instrument is used in a manner other than that specified in this manual, the device’s safety protections may not be effective.
INTRODUCTION
TxIsoLoop-1 and TxIsoLoop-2 galvanic isolators are devices used for electrical
isolation of 0(4)-20 mA current signals. Its purpose is to avoid measurement
errors typically found in installations that have problems with electrical
potential difference and ground loops
These isolators do NOT require an electrical power supply. The energy obtained
by passing the electric current through the insulator input actively generates
the output current.
Features
- Galvanic isolation between input and output.
- Models with one or two input/output channels.
- The device does not require a power supply.
- High accuracy.
SPECIFICATIONS
Table 1 Technical specifications
| FEATURES | TXISOLOOP |
|---|---|
| Input signal | 0(4) to 20 mA (Check minimum current for proper operation) |
Voltage drop − Input/output
without protection (Vdrop)
| < 3 Vdc
Voltage drop − Input/output with
protection (Vdrop)
| < 5 Vdc
Output signal| 0(4) to 20 mA
Max. load (RL)| 1450 R
Total accuracy| · 0.2 % @ 0 to 60 °C / RL = 250 R
· 0.3 % @ -20 to 75 °C / RL = 250 R
Minimum operating current| > 0.1 mA
Maximum input current| < 40 mA
Response time| 2 ms @ RL= 250 R
Current limit| 31 mA
Electrical isolation| · 3000 Vac / 10 seconds
· 240 Vac continuous
EMC| EN 61326-1 (without performance degradation)
Work environment| · Temperature: -20 to 75 °C
· Relative humidity: 20 to 90 %
Housing| ABS (60 %) + PC (40 %)
Protection index| IP40
Wire gauge for connections| 0.14 a 1.5 mm²
Recommended torque| 0.8 Nm
Terminal enclosure| Polyamide
ELECTRICAL INSTALLATION
To ensure perfect operation of the TxIsoLoop isolator, the circuit where the isolator input is connected must provide a minimum electrical voltage (V1).
You can supply the electrical voltage in two ways:
-
The device that generates the current signal is of the active type (source), where it provides the necessary electrical voltage itself.
With type source devices (transmitters, controllers, etc.), this voltage is provided by the device itself).
The minimum voltage value to be supplied by the generator can be calculated using the formula below: -
With sink type devices (2-wire transmitters), the energy is provided by an external power supply in series in the loop, as shown in Figure 2.
In this option, the inserted source must provide enough voltage to meet the needs of the current generating device (generator, transmitter, controller, etc.) and the isolator.
The minimum voltage value to be supplied by the power supply can be calculated using the formula below:
ELECTRICAL CONNECTIONS
To configure TxIsoLoop-1, use the following wiring diagram:
To configure TxIsoLoop-2, use the following wiring diagram:
TXISOLOOP-2 – SIGNAL SPLITTER FUNCTION
If needed, TxIsoLoop-2 can be used as a 4-20 mA signal splitter, as shown in
the figures below:
ACTIVE CURRENT SIGNAL
PASSIVE CURRENT SIGNAL
To duplicate the signal, the two outputs of the device must be connected to a load.
INSTALLATION RECOMMENDATIONS
- Input signal conductors must run through the plant separately from the supply and output conductors. If possible, in grounded conduits.
- The power supply for the electronic instruments must come from a proper instrumentation network.
- In control applications, it is essential to consider what can happen when any part of the system fails.
- It is recommended to use RC FILTERS (noise suppressors) at contactor coils, solenoids, etc.
MECHANICAL INSTALLATION
The transmitter is intended for a 35 mm DIN rail mounting.
WARRANTY
Warranty conditions are available on our website www.novusautomation.com/warranty.
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