
AV-300i Version 2 User’s Guide
—————— Function Description ——————
Ch.1
37
N
OTE
!
In the 0...3 Hz output frequency range a faster I
2
t function is active. It is tuned to reduce the current
limit to I
CONT
if an overload equal to 1.36
.
I
CONT
is applied for a period longer than 2 seconds.
The current limit is reset when the fastest accumulator is at zero or when the output fre-
quency overcomes a 3 Hz value.
The current limits depend on the value of I
CONT
(I
2N
.
Derating factor) which is selected
according to the ambient temperature, the switching frequency and the main voltage.
N
OTE
!
the function can not be parameterized.
1.3.2.7.2 Motor Thermal Protection (Motor Protection)
This function is similar to the protection of the motor thermal relay controlled by the Drive. This protection states
the I2t typical behavior.
When the protection gets active, it is possible to generate an alarm condition.
N
OTE
!
Some motors have a motor current (Ic) higher than the rated one (In). The service factor
makes reference to the Ic/In ratio.
Description:
STARTUP
Startup config
Motor protection
Service factor
Motor OL factor
Motor OL time
Save config ?
Service factor
Service factor
Motor OL factor
Allowed motor overload factor referring to the Motor nominal current * Service factor.
Motor OL time
Allowed overload time with a current equal to Motor OL factor
The integrator state is given by:
Mot OL accum %
It gives the percentage state of the Rms current integration.
100 % = I
2
t alarm level
It is available as a digital signal
Mot OL trip
It states that the trip condition of I
2
t has been reached. Possible or non-possible overload.
The intervention time depends on the value of the motor current as follows:
(Motor nominal current * Service factor * Motor OL factor )^2* Motor OL time
Overload time = ———————————————————————————————
(Motor current)^2
Содержание AV-300i
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