IM3G-VX
Doc. N° MO-0068-ING
Rev.
1
Pag.
16
of
36
Copyright 2010 - Microener
7. DIGITAL INPUTS
Three inputs are provided: they are active when the relevant terminals are shorted
-
2
(terminals 1 - 2) : it blocks the operation of the relays associated to the time delayed elements
of the overcurrent functions (I>) or (I>>) or (I>+I>>).
-
3
(terminals 1 - 3) : it blocks the operation of the relays associated to time delayed elements
relevant of the functions Under Impedance of Reverse Power :
(Z<) or (Ir) or (Z<+Ir)
-
4
(terminals 1-14) : It blocks the operation of the relays associated to one or more of the functions
1U, 2U, 1f, 2f in any possible combination
When a function is blocked the pick-up of its output is inhibited. For input -2- programming allows to
have the inhibition either permanent as long as the blocking input is active (t
2
=OFF) or automatically
removed after the expiry of the set trip time delay of the function involved plus additional time 2tBF
(t
2
=2tBF). By proper interconnection of the blocking inputs and blocking outputs of different relays it is
possible to configurate very efficient arrangements of logic fault discrimination as well as to feature a
safe and quick breaker back-up protection.
8. TEST
Besides the normal "WATCHDOG" and "POWERFAIL" functions, a comprehensive program of self-test
and self-diagnostic provides:
Diagnostic and functional test, with checking of program routines and memory's content, run every
time the aux. power is switched-on: the display shows the type of relay and its version number.
Dynamic functional test run during normal operation every 15 min. (relay's operation is suspended
for less than
4ms). If any internal fault is detected, the display shows a fault message, the Led
"PROG/IRF" illuminates and the relay R5 is deenergized.
Complete test activated by the keyboard or via the communication bus either with or without tripping
of the output relays.
