MM30-DK
Doc. N° MO-0050-ING
Rev.
2
Pag.
11
of
36
Copyright - 2010 - Microener
2.2.3.10 - Autosetting
The complexity of properly set a motor protection, frequently produces undesired tripping or
non-operation of some of the functions.
The relay MM30-DK can automatically select the best setting of the parameters according to motor
and system basic data. These data are:
-
System frequency
=
Fn
=
50 o 60
Hz
-
Rated primary current of phase C.Ts.
=
In
=
0-9999
A
step 1A
-
Rated primary current of earth fault C.
T =
On
=
0-9999
A
step 1A
-
Motor rated current
=
lm
=
0.1-1.5
In
step 0.01In
-
Motor starting current
=
lst
=
0.5-9.9
Im
step0.1 Im
-
Starting time
=
tst
=
1-120
s
step 1s
-
Transition current level
=
ITr
=
0.11
Ist
step 0.1 Ist
-
Transition time
=
tTr
=
0.5-50
s
step 0,1s
Once these settings have been programmed, the “AUTOSET” function can be activated by the key
"ENTER" and all the parameters are computed and automatically set at values suitable for a
normal duty of the motor.
Particularly the motor warming-
up time constant “tm” is computed so that the motor, when stopped
after having run continuously at Rated Power (Rated current Im), can be immediately restarted at
least one time.
The parameters can anyhow be manually modified if different setting is needed.
