TVA – 080 / 100 / 120 / 180 / 200 / 220
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Application
The active isolation amplifier of the series
TVA
is used, dependent on version, for galvanic isolation of electrical
standard signals 0..10V / 0..1V / -5..+5V / -0,5..+0,5V / 0..20mA / 4..20mA / -10..+10mA or a pulse frequency
modulated (PFM) current signal 90...520Hz or for convert it into another standard signal or to adjust the signals
in the zero value and/or end value resp. amplification.
A galvanic isolation is sometimes the only possibility at error generating ground loops, unwished signal
overlapping and potential problems.
Thus, a current flow between more signal current circuits that distort the signal is avoided.
The free configurable resp. fix signal conversion, dependent on version, allows the flexible adaption of different
systems among each other, e.g. for connection of a 2-wire-measurand transducer with a current signal 4...20mA
to the input 0...10V of a SPS control.
The adjustable version is suitable, if sections, e.g. 5...14mA of a standard signal 4...20mA at the input should
amplified to a complete standard signal e.g. 4...20mA or e.g. for zero value adjustment of a fix adjusted
measurand transducer e.g. because of a position dependent zero value shifting.
At the versions TVA – 200 – U0 / TVA – 220 – U0 in one device there can be two electrical signals simultaneous
transmitted separately or one electrical standard signal can be doubled into two separated electrical standard
signals by parallel or series connection.
The signal input for pulse frequency modulated (PFM) current signal 90...520 Hz in combination with
corresponding measurand transducer resp. signaling transmitter is especially suited for long transmission links
of several 1000 m. The special type of the signal makes in insensitive against the negative characteristics of
cables, that occurs only at higher length, like e.g. resistance and inductivity as well as error current through the
isolation.
Function
Measuring principle
Version TVA – 080 – U0 / TVA – 100 – U0 / TVA – 200 – U0 – adjustable version
The connected electrical standard signal 0..10V / 0..1V / -5..+5V / -0,5..+0,5V / 0..20mA / 4..20mA / -10..+10mA
is measured by the evaluation circuit, adjusted according to the front-sided trimmer and transmitted galvanically
isolated to the simultaneous output signals 0...10V and 0...20mA or 2...10V and 4...20mA according to the
settings of the internal configuration switches.
The respective current resp. voltage signals at the output can be used simultaneous. Therefore there are
simultaneous 2 output signals at the single channel versions TVA – 080 – U0 / TVA – 100 – U0 and
simultaneous 4 output signals at the double channel version TVA – 200 – U0 are available.
Examples:
TVA – 100 – U0 Input signal:
0...10V is converted to output signal:
0...10V / 0...20mA
TVA – 100 – U0 Input signal:
5...18mA is converted to output signal:
2...10V / 4...20mA
TVA – 200 – U0 Input signal 1:
0...10V is converted to output signal 1:
0...10V / 0...20mA and
Input signal 2:
4...18mA is converted to output signal 2:
2...10V / 4...20mA
Version TVA – 120 – U0 / TVA – 180 – U0 / TVA – 220 – U0 – fix adjusted version
The connected electrical standard signal 0..10V / 0..20mA / 4..20mA or the pulse frequency modulated (PFM)
current signal 90...520Hz (not for the version TVA – 220 – U0) is transmitted by the evaluation circuit
galvanically isolated to the output signal 0...10V or 0...20mA or 4...20mA.
Examples:
TVA – 120 – U0 Input signal:
0...10V is converted to output signal:
0...10V
TVA – 120 – U0 Input signal:
90...520Hz is converted to output signal:
4...20mA
TVA – 220 – U0 Input signal 1:
0...10V is converted to output signal 1:
0...10V and
Input signal 2:
4...20mA is converted to output signal 2:
0...20mA
Measurand transducer supply
Version TVA – 100 – U0 / TVA – 120 – U0 / TVA – 200 – U0 / TVA – 220 – U0
The integrated measurand transducer supply allows the direct connection and thus the supply of 2-wire and 3-
wire transmitter.
At the versions TVA – 200 – U0 / TVA – 220 – U0 the measurand transducer supply is two times available, one
for each channel separately.
Version TVA – 080 – U0 / TVA – 180 – U0
A measurand transducer supply is not available.
