DRN-ST
STRAIN INPUT SIGNAL CONDITIONER
Made in the USA
INFINITY
Electromagentic Compatibility
Year 2000 Compliant

The DRN Series of DIN rail-mountable signal conditioners are available for Thermocouple, RTD, Strain, Process, AC Voltage, AC Current and Pulse/Totalizer input types. The factory calibrated signal conditioners are ideal for all process and power monitoring applications, they feature 3-way isolation, high accuracy input, programmable outputs, and are excellent front end interfaces for programmable logic controllers or data acquisition systems. For maximum user configurability the signal conditioners allow complete input-output scaling via a RS-232 connection to any PC or PLC.

Software Description
The signal conditioner configuration program is a MS DOS/Windows program (this manual is for the Windows version). It is designed especially for the DRN Series Signal Conditioner. This program will run on any PC with Windows application and will start automatically.
What You need:
ò Your choice of the signal conditioner
ò IBM PC or compatible
ò Windows 3.1 or higher, or Windows 95
ò RJ12 connector with telephone cable
ò Adapter (DB9/25 to RJ12)
SETTING UP YOUR SYSTEM
DRN Computer Connection
INPUT RANGES
▒30mV/ ▒100mV / Ratiometric or nonratiometric

EXCITATION
10V @ 30mA or external

INPUT IMPEDANCE
More than 1Mohm

ISOLATION
Three way isolation up to 1800 V Peak for 1 minute, 354 V Peak continuous per IEC spacing. Common mode rejection 100dB

INPUT OVER-RANGE PROTECTION
Voltage input: From -10 to +20V

ANALOG TO DIGITAL TECHNIQUE
Multiple slopes

READ RATE
8 readings/second, automatic polarity

ACCURACY AT 25 ░C
▒0.2% of FS ▒ 2 counts

TEMPERATURE STABILITY
75 ppm/░C typical

STEP RESPONSE FOR RS232 OUTPUT
2 seconds to 99% of the final value (Filter time constant = 64)

RESPONSE TIME
To verify the response time, check the carriage return <CR>, it will be sent at the end of the response. You can send another command after you receive the <CR>. i.e. send: *X01 / response: X01 <DATA><CR>

WARM UP TO RATED ACCURACY
30 minutes

ANALOG OUTPUT SIGNAL TYPE
Voltage: 0-10 Volt, maximum current 10mA

Current
0-20 mA or 4-20 mA, maximum compliance voltage 10 Volts (maximum loop resistance 500ohm)

ANALOG OUTPUT LINEARITY
0.1% of FS

ANALOG OUTPUT STEP RESPONSE TIME
2 seconds to 99% of the final value

INPUT POWER
10 to 32 Volt DC

POWER CONSUMPTION
3 Watts (125mA at 24V DC)

OPERATING AMBIENT
-5 to +55 ░C

STORAGE TEMPERATURE
-40 to +85 ░C

RELATIVE HUMIDITY
90% at 40 ░C non-condensing

INTRODUCTION
The Strain input signal conditioners are high performance instruments that measure bridge/voltages in 2 ranges, ▒30mV/▒100mV ratiometric or nonratiometric measurement, internal 10V excitation which may be disabled to use an external excitation. Key features scalable analog output and a simple RS232 interface for scaling analog output and range selection. The RS232 interfaces may also be used for digital transmission of input signal to a computer or a PLC. Additional features include three way isolation between DC power, signal input and analog output/RS232.
Signal Conditioner

POWER INPUT and ANALOG OUTPUT SETUP
DRN-ST
To connect the signal input proceed as follows:
1. Connect a DC power supply with an output voltage between 10 to 32Volt DC to the signal conditioner (J1). Note: If power supply used has current limiting, it may not be able to power the signal conditioners if the available output voltage is around 10Volt, since the peak current may reach 1 to 5 amp for a few milliseconds.

2. Determine the maximum voltage to be measured.

3. Determine the appropriate input signal range, i.e. ▒30 or ▒100mV.

4. Ensure that if the selected range is different from the default then change the internal range which is controlled by the software by using serial communication explained later in this manual.

5. Connect the signal input to screw terminal, and ensure that the screws are tight. Note: When ratiometric measurement with external excitation is needed, disable 10 V interval excitation and connect external excitation to ▒ EXC input.

6. To verify that the set up is correct, you may connect a DVM to the analog output. Once connected, power the signal conditioner and apply a known voltage from a DC source to input. Measure and compare with expected values. To custom scale the analog output proceed to the next step.

7. To view/change the scaling that relates the analog output to signal input: connect the RS232 output of the signal conditioner to an available serial port of a computer. The cable and the DB9 or DB25 connectors are available as an option.

8. Turn on the computer, start Windows 3.0 or higher and run the Signal Conditioner Configuration Setup Program. If the program has not been installed, then insert the 3.5ö floppy disk in either drive A or B. From the Program Manager choose File, Run; in the command box type either A: setup or B: setup according to your drive designation. The program will create an icon for the signal conditioner. You may start the program by clicking on this icon.

9. Start the configuration program, you need to indicate which serial port is to be used for serial communication by checking the appropriate check box on the opening menu. Note: It is not necessary to know the serial communication protocol (baud rate, parity, 7/8 data bit and stop bit). The program will determine this information automatically. However, it is good practice to mark the protocols used on the signal conditioner label if different from default.

10. Once the program starts it will automatically detect the signal conditioner configuration and will display a window of available options. To view the signal input click on the display on/off.

11. To change analog output scaling choose analog output scaling and enter the desired values.

12. Once the custom scaling is finished, ensure that Send Configuration is clicked, otherwise the changes will not take effect.

13. The input/output scaling may be fine tuned, while both communication and analog output are active. You may make a change to the analog output in the configuration program, and watch the DVM connected to analog output of the signal conditioner follow the new settings.

14. You may save or print a particular configuration by selecting the file menu. ItÆs always a good practice to both print and save the scaling of each signal conditioner.

15. If the program is not able to establish communication then an error message is displayed. This happens either when the wrong serial port is specified or when the cable is accidentally disconnected.

Hazard This device is marked with the international hazard symbol. It is important to read the Setup Guide before installing or commissioning this device as it contains important information relating to safety and EMC.

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