WEG ECW500, User Manual

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Functional Description .
54 | ECW500
■ Excitation loss;
■ Excitation overvoltage;
■ Excitation overcurrent;
■ Overvoltage at the stator terminals;
■
Undervoltage at the stator terminals;
■ Underfrequency;
■ MECC mode;
■
Feedback loss;
■ Rotating diodes fault;
■ LEOC actuating;
■
LTOC actuating;
■ U/F actuating;
■ LEUC actuating;
■
Anybus offline.
6.10 SOFT START
The ECW500 has a soft start function for the operating modes MTVC and MECC, which are the offline modes.
This function increases the reference of the operating mode gradually up to the final value set.
The ECW500 allows setting the start level of the reference in terms of percentage in relation to the final value
and the time it will take the reference to reach the final value.
Figure 6.21 shows the behavior of the starting ramp.
Figure 6.21 Typical curve of actuation of the soft start function
6.11 AUTOMATIC TUNING (AUTOTUNING)
The ECW500´s automatic tuning function allows finding an appropriate adjustment for the
gains in
each operation mode.
To perform the Autotuning function it is necessary the ECW500 be controlling the excitation of the synchronous
machine in the operation mode to be adjusted (MECC, MTVC, MRPC or MPFC) and with the limiters out of
acting. Furthermore, when possible, it is recommended that the Autotuning be performed with the machine
running close to the operating point desired and with rated load.
However, before initiating the Autotuning procedure it is necessary to adjust the parameters and configurations
related to this function.
A detailed description of each parameter is shown below.
6.11.1 Configuration Parameters
<31070> Output Level Variation (AT Delta)