ISA DRTS.3 PLUS - 3 Characteristics of the Unit; General

Doc. SIE62153 Rev. 1 Page 7/24
3 CHARACTERISTICS OF THE UNIT
3.1 General
This section resumes the characteristic and the performances of the instrument. Listed
characteristics are all used when the instrument is connected to a computer, with the corresponding
commands.
In separate documents are described:
- The DRTS.3 PLUS user's guide;
- The resident program FWH6;
- The software TDMS.
On the instrument the following connections are available:
- Mains power supply (2 phase with ground);
- Four voltage outputs V1-V4, with a common neutral point;
- Three current outputs I1-I3, with a common neutral point;
- Ten input trip contacts, divided in two groups C1-C4+IMP1 and C5-C8+IMP2, with two
zero references;
- Four auxiliary output contacts A1-A4, without a common point;
- Serial interface RS232 and USB interface;
- Ethernet connector, for the IEC61850 option;
- Four measurement inputs: two for currents (low and high) and two for voltages (low and
high), for the optional board;
- The EXT. AMPL. female connector with low-power analog signals output, for external
booster or zero-power mode.
Note: connectors are always present even if the optional circuits aren’t present into the module.
Besides, on the front panel are available :
- Power-on switch;
- Four lights indicating the status of the instrument;
- Eight lights for the status of trip input (turn on when closed);
- Four lights for the status of auxiliary outputs (turn on when closed);
- One light per voltage and current output, that turns on when it is active.
When the instrument is turned on it performs a self-diagnostic check of all of the logic and analog
circuits. During the use, the instrument watches continuously the outputs, checking that they do not
deviate from the nominal.
The principal operation are as follows:
- Connect DRTS.3 PLUS to the portable PC, using the supplied cable;
- Connect DRTS.3 PLUS to the relay that is to be tested. The input trip contacts can be either
clean or with voltage, polarized using the optional DC voltage output, or the DC voltage of
the site;
- Execute the test;
- Test results are examined one at a time on the screen of the PC, and printed later on, after
they have been saved.
In the user manual, furnished with the instrument, are contained the following information:
- User's guide;