Motor Thermal Protection (Motor Protection) - GE AV-300i User Manual

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OTE
In the 0...3 Hz output frequency range a faster I
limit to I
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
according to the ambient temperature, the switching frequency and the main voltage.
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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 I 2 t typical behavior.
When the protection gets active, it is possible to generate an alarm condition.
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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
Motor OL factor
Motor OL time
The integrator state is given by:
Mot OL accum % It gives the percentage state of the Rms current integration.
100 % = I
It is available as a digital signal
Mot OL trip It states that the trip condition of I
The intervention time depends on the value of the motor current as follows:
Overload time = ———————————————————————————————
AV-300i Version 2 User's Guide
if an overload equal to 1.36
CONT
Service factor
Allowed motor overload factor referring to the Motor nominal current * Service factor.
Allowed overload time with a current equal to Motor OL factor
2
t alarm level
(Motor nominal current * Service factor * Motor OL factor )^2* Motor OL time
(Motor current)^2
—————— Function Description ——————
2
t function is active. It is tuned to reduce the current
.
I is applied for a period longer than 2 seconds.
CONT
.
(I Derating factor) which is selected
CONT 2N
2 t has been reached. Possible or non-possible overload.
Ch.1
37