GHM Martens TV125L, Руководство по эксплуатации

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Universal isolating amplifier TV125L
Product description
Isolating amplifiers of the series TV125L are suitable for potential isolation or for conversion of unit signals. The
universal configuration of the inputs and the output limit the number of types to one version.
The input measuring ranges can be switched between 0 … 20 mA and 4 … 20 mA or 0 … 10 V and 2 … 10 V
with a DIP switch on the front. The input measuring ranges can be switched between 0 … 20 mA and 4 … 20
mA with a DIP switch on the front.
With the microprocessor-controlled measurement logging, undercutting and exceeding of the measurement
range are detected and indicated via a two-colour status LED on the front side. Then the current output is also
set to a defined starting or final value.
The current input is protected with an automatically resetting fuse (PTC) against static overvoltages up to 32 V
AC/DC.
2.1 Scope of Delivery
- TV125, according to ordering code
- Power Rail DIN rail adapter (available for LP version, only)
- this operating manual
- further document if applicable
2.2 Principle of operation
The input signals are amplified in the input stage, with amplitude limiting and band limiting with an analogue
filter. The filtered signal is digitalised by the analogue-digital converter of the microprocessor with a resolution
of 14 bits. After scaling and a measurement range check, the signal is transmitted by an optocoupler to the
output stage by means of pulse width modulation. The output stage converts the PWM signal into a proportional
analogue value at which the current output is emitted. The output current is limited to a defined starting and end
value.
The three circuits: Inputs, outputs, and auxiliary voltage, are galvanically separated with amplified isolation.
2.3 Layout of the measuring system
①
Terminals for auxiliary voltage
②
Terminals for current output
③
Type plate
④
Status-LED
⑤
DIP swiches for configuration
⑥
Terminals for voltage input
⑦
Terminals for current input
Figure 1 Isolating Amplifier TV125L