Motor protection
SIMOCODE pro
GWA 4NEB 631 6050-22 DS 03
3-5
3.2 Overload protection
Description
SIMOCODE pro protects three-phase and AC motors in compliance with
IEC 60947-4-1. The trip class can be set to 8 different settings, ranging from
Class 5 to Class 40. Thus, the tripping time can be adapted precisely to the
power-up behavior of the motor, improving performance. Additionally, the
"Thermal motor model" and time to overload trip are calculated and made
available to the control system. After an overload trip, the remaining cooling
down period is displayed (see Class). The motor current is saved in the case
of an overload trip.
Depending on the control function, the set current I
s
is separately
parameterizable for one or two speeds (I
s
1 and I
s
2).
The motor rated current is usually set with set current I
s
1. This value can be
found on the type plate of the motor. It is the basis for calculating the
overload trip characteristic curve.
Set current I
s
2 is only necessary for motors with 2 speeds so that adequate
overload protection for the higher speed is also ensured. Generally, I
s
2
should be set higher than I
s
1.
Set current I
s
1
Range: Depends upon the selected current measuring module or
current/voltage measuring module.
Transformation ratio - active
When using an interposing transformer, or if the main supply cable is looped
several times through the current measuring module or the current/voltage
measuring module, you can enter the transformation ratio of the interposing
transformer.
Activate the checkbox if you wish to use this option.
The parameterized set current thus continues to correspond to the actual
nominal motor current and does not have to be converted.
The transformation ratio is calculated from the ratio between nominal motor
current [A] and measuring current [A] or any multiple of this ratio.
Note
This parameter is only available when using basic unit 2 above version
*E03*.
Set current I
s
1: 0.3 A up to 3 A
2.4 A up to 25 A
10 A up to 100 A
20 A up to 200 A
63 A up to 630 A
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