11
3.2.1
THE LEDS AND THE BUZZER INDICATIONS
The LEDs and the buzzer indications of the compact RTU are similar to the modular RTU.
However there is a special ticking sound that can only be heard in the compact RTU which
has digital inputs defined.
3.2.2
TESTING INPUTS AND OUTPUTS OF THE COMPACT RTU
The unit is equipped with tools for testing the inputs and outputs under field conditions. There
are 2 I/O test buttons, when number 1 is pushed the first input and output are tested, when
number 2 is pushed the second input and output are tested.
INPUT TEST
– The test begins by pushing the appropriate test button and it is indicated by a
long beep
.
Each change in the status of the selected input will generate a short beep of
the buzzer
.
OUTPUT TEST
– While being in INPUT TEST, push the appropriate test button again, this will terminate
the INPUT TEST and will start the OUTPUT TEST. An "open" command will be sent to the selected
output followed by a single beep
.
Another push of the test button generates a "close"
command followed by a double beep
.
Each push of the appropriate test button will switch the solenoid between "open" and "close"
positions.
The system will exit test mode and return to normal activity after 60 seconds without touching
the buttons.
3.2.3
SELECTING THE DESIRED ANALOG INPUT TYPE
The system can handle analog inputs of 4-20 mA or 0-2.5 volts. Next to the terminal block
there is a jumper JP7 that when inserted as shown in the picture above makes the analog
input to accept 4-20 mA signals. When the jumper is removed the accepted signal will be 0-
2.5 v
3.3
TECHNICAL INFORMATION
The 2W interface
Power supply
12v DC 2.5 A
Minimal supply voltage
10.5v DC
Load free consumption
115-120 mA
Consumption contributed by each RTU
1.5 - 2.2 mA
Output voltage
***
36v DC
***
Main fuse
8A
Line fuses
2 x 1A
The 2W RTU
Typical supply voltage
***
36v DC
***
Minimal supply voltage
***
20v DC
***
Consumption measured by 2W tester
Test voltage 8v DC
14v DC
36v DC
Compact RTU
Economical RTU
0 mA
0 mA
-
0.75 mA
0.5 mA
0.75 mA
Output voltage
12-17v DC latch
–
pulse width 70 ms
Digital inputs
Dry contact
Analog inputs
4-20 mA or 0-2.5v externally energized
*** in normal operation mode the output voltage of the 2W interface is varying in a high
frequency and can not be measured by regular volt meters. The output voltage of 36v DC can
only measured under special test mode. To put the 2W interface in special test mode, set the
address switch to 000000 and press the RESET button.
