Strain Gauge/Bridge Converter Isolated DAT5025 programmable.
GENERAL DESCRIPTION
The strain gauge converter DAT5025 is designed to provide a voltage or current output linear and proportional with the input voltage coming from the output of a strain gauge or bridge transducer.
The user can program the bridge excitation voltage value, the input and the output ranges by the DIP-switches located on the side of device.
The regulation of Zero and Span values is made by the ZERO and SPAN potentiometers located on the top of device.
The 2000 Vac isolation between input, power supply and output eliminates the effects of all ground loops eventually existing and allows the use of the converter
in heavy environmental conditions found in industrial applications.
The DAT5025 provides on the output side an auxiliary supply source to connect both active and passive loads.
It has been made in compliance with the EEC/336/89 standard on the Electromagnetic Compatibility.
It is housed in a plastic enclosure of 12.5 mm thickness suitable for DIN rail mounting in according to EN-50022 and EN-50035 standards .
USER INSTRUCTIONS
The converter DAT5025 must be powered by a direct voltage included in the 18 V to 30 V range. The power supply must be applied between the terminals Q (+Vdc) and R (GND1).
The output connections must be made as shown in the section "Output connections".
Voltage output: between the terminals N (Out V) and M (GND2); passive current output: between the terminals P (Out I) and M (GND2) for the sink currents; active current output : between the terminals O (Vaux) and P (Out I) for the source currents.
The input connections must be made as shown in the section "Input connections".
The bridge transducer must be powered between the terminals E (+EXC) and F(-EXC); the bridge's output voltage signal must be connected between the terminals G or H(+ IN) I or L (- IN).
The configuration of the bridge excitation voltage, the input and output ranges values is made by DIP-switches (refer to the section “Input ranges table” and “Output ranges table”).
After the converter configuration, it is necessary to calibrate it using the ZERO and SPAN regulations; this operation is illustrated in the section “DAT 5025: Configuration and calibration”.
To install the device refer to the section “Installation instructions”.
TECHNICAL SPECIFICATIONS
INSTALLATION INSTRUCTIONS
The DAT5025 device is suitable for fitting to DIN rails in the vertical position. For optimum operation and long life follow these instructions:
When the devices are installed side by side it may be necessary to separate them by at least 5 mm in the following case:
- If panel temperature exceeds 45°C and at least one of the overload conditions exists.
-if panel temperature exceeds 35°C and both the overload conditions exist.
Overload conditions:
- Use of the current output (terminal P).
-
Use of output auxiliary supply (terminal O ).
Make sure that sufficient air flow is provided for the device avoiding to place raceways or other objects which could obstruct the ventilation slits.
Moreover it is suggested to avoid that devices are mounted above appliances generating heat; their ideal place should be in the lower part of the panel. Install the device in a place without vibrations.
Moreover it is suggested to avoid routing conductors near power signal cables (motors, induction ovens, inverters, etc...) and to use shielded cable for connecting signals.
DIMENSIONS (mm)
PROGRAMMING
1) Refer to the “Input ranges table”, determine in the column " Input " the position of the input value.
Refer to the “ Output ranges table " and determine in the column " Output" the position of the output value. In the correspondent lines is shown how to set the DIP-switches .
2) Set the DIP-switches as indicated .
3) Set the minimum value of the input range .
4) By the ZERO potentiometer calibrate the output at the minimum value .
5) Set the maximum value of the input range .
6) By the SPAN potentiometer calibrate the output at the maximum value .
7) Repeat the operation from the step 4 to the step 7 until the output value will be correct ( 3 attempts typically required).
Configuration ex. : in: 0÷10 mV, Vexc = 10 Vdc, out 0÷10 Vdc
Input switches configuration (SW1): On, On, On, On, Off, Off(*).
Output switches configuration (SW2): Off, Off, Off, On
(*) = switch for the configuration of the Bridge excitation voltage value .
CONNECTIONS
LOAD CHARACTERISTIC
ISOLATION STRUCTURE
