MM30-DK
Doc. N° MO-0050-ING
Rev.
2
Pag.
7
of
36
Copyright - 2010 - Microener
2.2.3
– Functions and Settings
2.2.3.1
– F49 – Thermal Image (See curves § 20)
The current “
I
“ producing motor warming-up is computed as a conventional composition of
Positive Sequence “
Id
“ and Negative Sequence “
Is
“ components of the motor current.
-
Computed current:
-
Allowed overloading time
(See Curve § 19)
The trip time delay “
t
“ of the thermal element, depends on the warming-up time constant
“
tm
“ of the motor, on the previous thermal status (Ip), on the admissible continuous overload
(Ib) and, of course, on the actual load (I)
tm
=
(1-60)min.
I
=
computed current
Ip
=
preheating current
Ib
=
continuously admissible current
(1-1.3)Im, step 0.01Im
Im
=
motor rated current
(0.1-1.5)In, step 0.1In
- Steady motor
cooling-down
time constant:
to
= (1-10)tm, step 1tm
The cooling-
down time constant of the motor when running is “
tm
”; it is automatically changed
to "
to
" when the motor current drops below 0.1 lm (running/steady motor discrimination
level).
-
Thermal prealarm
:
Ta/n
= (50-110)%Tn, step 1%Tn
An alarm signal is issued when the simulated warming exceeds the set percentage of the
motor rated temperature Tn.
Automatic 1% drop out percentage.
-
Restart inhibition
:
Ts/n
= (40-100)%Tn, step 1%Tn
To inhibit a new motor starting before cooling down to 99% Ts/n, reset after tripping of the
thermal element takes places when T< 0.99[Ts].
2
2
3Is
Id
I
2
2
2
2
(Ib/Im)
(I/Im)
(Ip/Im)
(I/Im)
In
tm
t
Содержание MM30-DK
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