HD978TR_1
HD978TR_2

HD 978TR3, HD 978TR4, HD 978TR5, HD 978TR6 – Signal Converters / Amplifiers with 4÷20mA or 0÷10Vcc Output Configurable with HD788-TCAL by PC Through RS232C

Configurable signal converters/amplifiers with current or voltage output.
HD978TR3, HD978TR4,HD978TR5 and HD978TR6 are signal converters/
amplifiers configurable with mV input. The mV input signal range can be
configured from -10mV to +60mV through a button, by using the HD778-TCAL
simulator and DeltaLog7 software or a tension calibrator with mV output.
HD978TR3 and HD978TR5 have 4…20mA current output. HD978TR4 and
HD978TR6 have 0…10Vdc voltage output.
0…1Vdc, 0…5Vdc and 1…5Vdc outputs are available on request.

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Product Description

Configurable signal converters/amplifiers with current or voltage output.
HD978TR3, HD978TR4,HD978TR5 and HD978TR6 are signal converters/
amplifiers configurable with mV input. The mV input signal range can be
configured from -10mV to +60mV through a button, by using the HD778-TCAL
simulator and DeltaLog7 software or a tension calibrator with mV output.
HD978TR3 and HD978TR5 have 4…20mA current output. HD978TR4 and
HD978TR6 have 0…10Vdc voltage output.
0…1Vdc, 0…5Vdc and 1…5Vdc outputs are available on request.
A led indicates the alarm situation and it helps user during the programming.
The instrument is also protected against polarity inversions.
Input and output are galvanically isolated between them: this is necessary
to eliminate problems due to the mutual influence of the devices originated by
disturbs caused by the different mass paths.
The instrument is housed in a 2 modules Din (Width 35mm) container with
standard connection for 35mm omega bar for the models HD978TR3 and
HD978TR4; a wall container for the models HD978TR5 and HD978TR6.
The 4…20mA current output stage of HD978TR3 and HD978TR5 is a passive
two-wire and it supplies power to the converter through the current loop.
Fig.1 shows the mechanical dimensions of the HD978TR3 and TR4: the width
of the container is a 2 modules DIN (35mm). Fig.5 reports the wiring diagrams
of the HD978TR3 and a DeltaOhm pyranometer. Fig.6 indicates the typical
connection of the HD978TR4.
In order to obtain the maximum precision, the connection to the thermocouple
should not exceed 3 meters long and should be performed with a shielded cable.
It is also recommended not to pass wiring near cable for power signals (electric
motors, induction furnaces, inverter etc.). The working temperature should be
included in declared operating temperature.
In the diagrams reported, the RL (Load) symbol represents any device introduced

in the current loop, that is to say any indicator, controller, data logger or recorder.
The two terminals reporting EARTH are connected internally between them and
they are necessary to connect the ground terminal coming, for instance, by a
pyranometer to the grounded, as you can see from the diagrams.
The response curves of the instruments are reported in figures 2 (current
output of HD978TR3 and HD978TR5) and 3 (voltage output of HD978TR4 and
HD978TR6).
Fig.7 reports, as an example, the connection to be performed for reading the
voltage measured on a shunt DC: the converter assures the galvanic isolation
between device and voltage or current output; also configurability allows to
obtain the best correlation between read and amplified output voltage. We
recommend that you pick up the signal by using a sheltered cable and by
connecting the screen (shield) to terminal 9.
Programming of the operating range
Converters HD978TR3, HD978TR4, HD978TR5 are HD978TR6 are supplied
by default with range 0…20mV. The user can set a different range according
to his requirements with a minimum span of 2mV. The correspondence
between the read voltage and current or voltage output can be directed (for ex.
0mV / 4mA and 20mV / 20mA) or reverse (for ex. 20mV / 20mA and 0mV / 4mA).
Acquire the following tools for programming:
• source constant supply of suitable value (please see the specifications table),
• calibrator con mV output,
• connection cables,
• precision ammeter with 0…25 mA minimum range or 0…10Vdc voltmeter.
The setting must be done with the instrument already powered.
Set the calibrator so that it generates the voltage corresponding to the output of
the initial scale of the converter (4mA or 0V according to the model), by paying
attention to polarity. Wait 30 seconds for the voltage to stabilize.

Press and hold the button until the led starts flashing. Release the button. The
instrument has acquired the first value of the transmitter working range, the led
keeps on flashing. The instrument is now awaiting the second data of the full
scale range.
Set the calibrator in order to generate a voltage corresponding to the output of
the full scale (20mA or 10Vdc).
Press and hold the button until the led stops flashing.
Release the button and wait 20 seconds, without changing the calibrator’s
data, so that the converter saves the calibration data and is ready for working
normally. The operation ends with a flashing of the led.
The instrument has acquired the second point corresponding to the range you
want to set and is working normally.
The minimum value accepted by the instrument is 2mV. If after having
inserted the first range value V1 the user tries to insert a second value V2 with:
V2-V1 lower than 2mV, the instrument does not accept it and remains in standby
while the led flashing continuously.

Note: in place of the current/voltage calibrator, you can use the Delta Ohm
HD778-TCAL. This instrument has to be connected to a serial port of the PC and,
by means of the proper DELTALOG7 software, automates all the steps described
above for programming the operating range.
The HD778-TCAL is supplied with its software. Connected to the HD778-TCAL
serial output of a PC, the user can configure the HD978TR3 and HD978TR5
(4…20mA or 20…4mA current) or the HD978TR4 and HD978TR6 (0…10Vdc or
10…0Vdc voltage) by following the instructions on the screen.

ORDERING CODES
HD978TR3: Configurable signal converter amplifier with 4÷20mA (20÷4mA)
output, for DIN bar
Input measuring range –10..+60mV. Default setting 0÷20mV.
Minimum measuring range 2mV.
HD978TR4: Configurable signal converter amplifier with 0÷10Vdc (10÷0Vdc)
output, for DIN bar
Input measuring range –10..+60mV. Default setting 0÷20mV.
Minimum measuring range 2mV.
HD978TR5: Wall mounting configurable signal converter amplifier with 4÷20mA
(20÷4mA) output.
Input measuring range –10..+60mV. Default setting 0÷20mV.
Minimum measuring range 2mV.
HD978TR6: Wall mounting configurable signal converter amplifier with 0÷10Vdc
(10÷0Vdc) output.
Input measuring range –10..+60mV. Default setting 0÷20mV.
Minimum measuring range 2mV.
HD778-TCAL: power generator in the range -60mV…+60mV, regulated by PC
through RS232C serial port, DELTALOG7 software for setting K, J, T and N
thermocouple transmitters.

 

Download

Manuals and Brochures here.  

HD978TR3_4_5_6.pdf

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