MM30-DK
Doc. N° MO-0050-ING
Rev.
2
Pag.
19
of
36
Copyright - 2010 - Microener
7. DIGITAL INPUTS
The relay is fitted with three digital inputs activated when the relevant terminals are shorted by a cold
contact :
- R.T.
(terminals 1-2)
Remote Trip control.
Activation of the input R.T. (Terminals 1-2 shorted) produces the
following operation :
The output relay associated to the function R.T. is energized
The Trip Number Counter R.T. is incremented by 1 unit
The event recording is activated and shows “CAUSE: RT”
- S.p.C.
(terminals 1-3)
Switch speed Control.
The Speed Control input is connected to an external N/O contact which
closes as soon as the motor is running. If the contact does not close
within the set start time [tst] from the moment the motor is energised,
the Locked Rotor function is tripped. The relay and the signal led
associated to ILR are energised, the recording on Last Trip will show
cause SpC and trip N° LR will be increased.
If the Speed Control function is not used, it must be disactivated by
programming the variable [Spc] = OFF (see § 12.1)
- RTD
(terminals 1-14)
Thermal probe.
This function is enabled by programming the variable
[RTD] = ON (see § 12.1)
If the function is enabled, the input RTD is activated when the resistance
connected to the terminals 1-14 exceeds the limits 50
> R
1-14
> 2900
.
This limits respectively correspond to “Shorted Probe” (<50
) or to
“Overtemperature” (R>2900
)
The activation of the input 1-14 produces the following operation:
The relay associated to R.T. is energized
The Led T> is lit-on.
The counter of Trip Number of the function T> is incremented
LastTrip recording shows : "CAUSE RTD"
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 10 ms). 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.
