IM3G-VX
Doc. N° MO-0068-ING
Rev.
1
Pag.
15
of
36
Copyright 2010 - Microener
a) - The user programmable relays (All but R5
– RDIAG) are normally deenergized (energised on trip).
One relay eventually associated to the instantaneous element of one of the functions, after pick-up
normally drops-out as soon as the tripping cause disappears.
If the cause remains longer than the time delay programmed for the delayed element of the same
function, the drop-out of the instantaneous relay is anyhow forced after an adjustable waiting time
[tBF].(Disactivation of the blocking output eventually used to block a relay upstream in the
distribution system).
Moreover any of the programmable relays can be programmed to be energised at the end of the
delay tBF(Breaker Failure function)
Reset of the output relays associated to any time delayed function can be programmed to take
place “Automatically” (tFRes= A) as soon as the tripping cause has disappeared, or “Manually”
(tFRes= M) by operating the ENTER/RESET k
ey on relay’s front or via the serial bus.
b) - The relays R5, R DIAG, are not user programmable; they are normally energized and get
deenergized on :
- internal fault of IM3G-VX
- Internal fault of REX-8
R5
- IM3G-VX power supply failure
R DIAG
- REX-8 power supply failure
- during the programming
- Interruption/fault on the serial
control communication
6. SERIAL COMMUNICATION
The relays fitted with the serial communication option can be connected via a cable bus a fiber optic bus
for interfacing with a Personal Computer (type IBM or compatible).
All the functionalities that can be operated locally (for example reading of input measurement and
changing of relay’s settings) are also possible via the serial communication interface.
Furthermore the serial port allows the user to read event recording and stored data.
The unit has a RS232 / RS485 interface and can be connected either directly to a P.C. via a dedicated
cable or to a RS485 serial bus, allowing having many relays to exchange data with a single master P.C.
using the same physical serial line. A RS485/232 converter is available on request.
The communication protocol is MODBUS RTU (only functions 3, 4 and 16 are implemented).
Each relay is identified by its programmable address code (NodeAd) and can be called from the P.C.
A dedicated communication software (MSCOM) for Windows 95/98/NT4 SP3 (or later) is available.
Please refer to the MSCOM instruction manual for more information Microelettrica Scientifica.
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