NOVUS TxIsoLoop-1, TxIsoLoop-2 User Manual

Iin = I

Vb= Voltage required by the 2-wire Vin = V

+ ( I

x RL )

Iin = I

TxIsoLoop-1 / TxIsoLoop-2

LOOP-POWERED ISOLATORS - OPERATING MANUAL V1.0x D

INTRODUCTION

The TxIsoLoop-1 and TxIsoLoop-2 are 0(4)-20 mA s ignal isolators with one and two channels respectively. They provide signal protection by electrically i solating the input signal from the output. The 4-20 mA input is meas ured and an identical isol ated signal is produced at the output. Its power is obtained from the 0(4)-20 mA input loop, dropping the need for an external power supply.

CHARACTERISTICS

• Input/output galvanic isolation.

• Models for 1 or 2 channels.

• Don’t require power supply.

• High accuracy.

• Calibration free.

ESPECIFICAÇÕES

• Input Signal (INPUT): 0 to 20 mA; 4 to 20 mA (check minimum current for proper operation)

• Max. Input voltage (Vin max.): 32 Vdc

• Voltage drop input/output without protection (Vdrop): < 3 Vdc

• Voltage drop input/output with protection (Vdrop): < 5 Vdc

• Output Signal (OUTPUT): 0(4) to 20 mA

• Max. Load (RL): 1450 R

• Accuracy: 0.2 % FS @ 0 a 60 ºC / RL= 250 R

0.3 % FS @ -20 a 75 ºC / RL= 250 R

• Operating current: > 0,1 mA

• Overload: < 40 mA; < 32 Vdc

• Response time: 2 ms @ RL= 250 R

• Isolation: 3000 Vac / 10 s

240 Vac continuous

• EMC: EN 61326-1

• Ambient temperature range: -20 to + 75 ºC

• Humidity: 20 a 90 %

• Case: ABS (60 %) + PC (40 %). Protection: IP40

• Wire gauge for connections: 0.14 a 1.5 mm²

• Recommended torque: 0.8 Nm

• Terminal blocks injected in Polyamide.

ELECTRICAL INSTALLATION

For proper operation, the TxIsoLoop requires some minimum voltage in the input loop. This voltage can be found in two ways:

1. In type source devices (trans mitters, cont rollers, etc ), this voltage is provided by the device itself.

Fig. 1 – TxIsoLoop typical connections

The minimum operating voltage can be calculated by the equation below:

V1 = V

Where:

2. In sink type devices (2-wire transmitters ) the energy is provided by an external power supply in series in the loop, as shown in Fig. 2.

Fig. 2 – TxIsoLoop us ed to isolate a 2-wire transmitter

In this arrangement, the p ower sup ply must prov ide enough v oltage such as power both the 2-wire transmitter and the TxIsoLoop.

The minimum voltage required to allow proper operation can be obtained from the equation below:

V1 = Vb + V

Where:

Vin = V

V1= Power supply voltage

transmitter

drop

out

drop

out

+ ( I

out(máx)

x RL )

NOVUS AUTOMATION 1/2

ELECTRICAL WIRING

The figure below shows the wiring scheme.

Fig. 3 – TxIsoLoop-1 connections

SAFETY INFORMATION

Any control system design sh ould take into acc ount that any part of the system has the potential to fail. Thi s product is not a protection or safety device and its alar ms are not intended to protect against product failures. Independent safety devices should be always provided if personnel or property are at risk.

Product performance and specifications may be affected by its environment and installation. It’s user’s responsibility to assure proper grounding, shielding, cable routing and electrical noise filtering, in accordance with local regulations, EMC standards and good installation practices.

SUPPORT AND MAINTENANCE

This product contai ns no serviceable parts inside . Contact our local distributor in case you ne ed authorized service. For troubl eshooting, visit our FAQ at www.novusautomation.com

Fig. 4 – TxIsoLoop-2 connections

Fig. 5 – TxIsoLoop-1 a nd TxIsoLoop-2 connections with and wit hout pr otec t ion

RECOMENDATIONS FOR INSTALLATION

• Signal wires should be instal led in grounded conduits an d away from power or contactor wires.

• The instrument should have its own power supply wires, which should not be shared with electrical motors, coils, contactors, etc.

• Installing RC filters is strongly rec ommended at contac to r coi l s or any other inductors.

• System failure should always be taken into account when designing a control panel to avoid irreversible damage to equipment or people.

MECHANICAL INSTALLATION

The transmitter is intended for DIN rail mounting:

LIMITED WARRANTY AND LIMITATION OF LIABILITY

NOVUS warrants to the original purchaser that this product is free from defects in material and workmanship under normal use and service within one (1) ye ar from the date of shipm ent from factory or from its official sales channel to the original purchaser.

NOVUS liability under thi s warranty shall not in any case exceed the cost of correcting d efects in the product o r of supplying replaceme nt product as herein p rovided and upon the expirati on of the warranty period all such liability shall terminate.

For complete informati on on warranty and liability limitations, check appropriate section in our web site: www.novusautomation.com

Fig. 6 – Isolator dime nsions

NOVUS AUTOMATION 2/2