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AC CONVERTERS
AC24, ACN24 a ACN230 |
AC CURRENT & VOLTAGE TRUE R.M.S. VALUE CONVERTER
AC24 - powered via the 4 to 20mA output loop
ACN24 - auxiliary power supply 24V DC
ACN230 - auxiliary power supply 230V AC |
Models: |
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AC24 |
ACN24 |
ACN230 |
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- true R.M.S. value
- handling inputs with a crest factor of up to 5
- frequency range from 40 to 1000Hz
- input-to-output-to-power supply isolation: 4000Vr.m.s.
- measuring range 0 to 120% of rated input
- conversion accuracy < 0,5%
- compact design
- designed for DIN 35 rail mounting |
The converter has been designed to convert the true R.M.S. value of
an AC signal into a unified-range DC voltage/current. The converter input includes a measuring transformer. It isolates
the input circuit from the converter itself and converts the input signal into a voltage, which is suited for further
processing. After full-wave rectification, R.M.S. value calculation and subsequent smoothing out, a DC voltage is created
at the output. An optocoupler is used to isolate the voltage input. The R.M.S. value is calculated in a monolithic
converter made by Analog Devices. Both the input and the output circuit are overload-protected.
This converter is also suited for handling the inputs whose waveforms are heavily
distorted. It can even be applied in control systems including frequency converters or other non-linear control elements.
Mean value converters may generate errors amounting to several tens of percent when distorted waveform signals are measured.
The table below shows a comparison between the mean and true R.M.S. value measurements for waveforms showing various
distortion factors. |
| Signal waveform |
Distortion factor (Vmax / V R.M.S.) |
True R.M.S. value |
Mean value calibrated in corresponding sine wave r.m.s. value |
Error of mean value based measurements |
| Sine wave |
1,414 |
0,707 |
0,707 |
0% |
| Symmetrical square wave |
1,00 |
1,00 |
1,11 |
+11,0% |
| Triangular |
1,73 |
0,577 |
0,555 |
-3,8% |
| Gaussian noise |
3 |
0,333 |
0,295 |
-11,4% |
| Various mark-to-space ratio square waves |
2
10 |
0,5
0,1 |
0,278
0,011 |
-44%
-89% |
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Electrical specifications: |
| - operating temperature range: |
-25...+80°C |
| - storage temperature range: |
-40...+ 80°C |
| - supply voltage: |
24V DC± 30% |
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230V ± 15%, 50 - 60Hz, max.2VA |
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other options (80..300V DC, 60..250V AC) by arrangement |
| - protection: |
resettable thermal cut-out in primary circuit |
| - rated inputs: |
1A, 2,5A, 5A AC |
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57,7V, 100V, 110V, 220V, 230V, 380V, 400V, 500V AC |
| - voltage input current load: |
0,5mA |
| - input overload capacity |
voltage: |
2 Unom - 1s |
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current: |
2 Inom - 1min, 20 Inom - 1s |
| - standard measuring range: |
0...1,2 Inom ( Unom ) |
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other options available per order |
| - output: |
4-20mA, 0-20mA, 0-10V |
| - output current limit: |
typically 28mA (electronic cut-out) |
| - current output maximum load: |
15 / Iout (ohm) |
| - voltage output maximum load: |
10mA |
| - transfer function: |
linear |
| - transfer function maximum error: |
< 0,5% |
| - error for a crest factor of 5: |
2,5% |
| - temperature induced error: |
< 0,02%/°C |
| - test voltage: |
4000Vr.m.s. |
| - output signal settling time: |
300ms |
| - weight: |
120g |
| - enclosure: |
casing / terminal board: |
IP40 / IP10 |
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| Type tests: |
Standard type test:
EMC:
Safety: |
to CSN EN 60688
to CSN EN 61326-1
assessed acc. to CSN EN 61010-1 |
Terminal designation: |
AC24
ACN24, ACN230 |
1,2...input to be measured
3,4...output 4-20mA (power supply of the output loop: 4 is +)
1,2...input voltage to be measured
3,4...output terminals (4 is +)
5,6...power supply terminals, polarity insensitive |
Dimension sketch:
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Ordering instructions:
Your order should include:
- converter type
- rated input
- rated output
- non-standard options (different power supply, measuring range, frequency setting, etc. ... )
- quantity (No. of pieces) |
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Czech version 
Polska verze 