NOVUS TxIsoLoop-1/TxIsoLoop-2 - Manual

NOVUS AUTOMATION 1/2
TxIsoLoop-1 / TxIsoLoop-2
LOOP-POWERED ISOLATORS - OPERATING MANUAL V1.0x D
INTRODUCTION
The TxIsoLoop-1 and TxIsoLoop-2 are 0(4)-20 mA signal isolators
with one and two channels respectively. They provide signal
protection by electrically isolating the input signal from the output.
The 4-20 mA input is measured and an identical isolated 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 (transmitters, controllers, 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 = Vin Where: Vin = Vdrop + ( Iout(máx) x RL )
Iin = Iout
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 used to isolate a 2-wire transmitter
In this arrangement, the power supply must provide enough voltage
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 +
Vin Where: V1= Power supply voltage
Vb= Voltage required by the 2-wire
transmitter
Vin = Vdrop + ( Iout(máx) x RL )
Iin = Iout