Functional Description .
50 | ECW500
■ low level (parameter 30130), with delayed action.
So, if the terminal current exceeds the value set as high level, the limiter will act immediately to keep the current
at this level. But if the terminal current is above the low level and below the high level, the LTOC will lead the
terminal current to the value defined by parameter 30130 after reaching the integral limit (Ixt), that is defined by
the following equation:
In which:
parameter 30128.
Once the condition of application allows machine operation below the low level, the limiter will turn off and
returns to the previously active mode control.
Figure 6.20 Behavior of integral actuation for the terminal overcurrent limiter (LTOC)
NOTE!
As a first adjust for this protection, set the low level with the same value of the machine rated
current (30060) and the high level to 10% above the low level. The LTOC time can be maintained
at default value (15s).
NOTE!
The terminal overcurrent limiter operates in all operating modes, except in the MECC mode.
LTOC can be disabled using the 30124 parameter and a relay can be configured to indicate its
operations.
6.7 PROTECTIONS
The ECW500 has ten protections for several events that may happen during the operation. The main objective
of the protections is to warn the operator that there is an abnormal and harmful situation for the machine.
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