WEG ECW500, User Manual

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Maintenance .
ECW500 | 73
High voltage on the generator in the MTVC mode
Check the following configurations of the ECW500:
■
The voltage reference of the mode MTVC.
■ Parameters indicating the voltage of the primary and secondary of the measurement transformers.
■ The voltage feedback connections of the product to the generator.
■ The operating mode selected must be MTVC.
Instability in the voltage control
If the voltage control presents instability, first check the control gains (Kp, Ki and Kd) for the operating mode
used.
If the gains adjustment
in a satisfactory control, verify if the excitation transformers meet the
recommended specifications in chapter 12 Technical Specifications.
Limiters and protections actuating
The limiters and protections of the ECW500 serve to protect both the synchronous machine and the equipment
itself. If any of these conditions is indicated, make sure that the problem is solved. Also check that the
configurations for each limiter and protections are correctly dimensioned for the relevant application.
Measures displayed on the HMI or via communication are very different from a known load
If the measures indicated by the ECW500 are significantly different from the expected measures for a known
load, check that the measurement of the phase current is properly connected to phase B and not phases A and
C. Also check that the polarity of the current transformer is correct. If the problem is only regarding the signal of
reactive power, for example, invert the polarity of the current transformer. Also check the configurations of the
primaries and secondary of the current transformers and voltage in the ECW500.
Communication faults
Check the configuration of the MODBUS-RTU communication and of the physical interface of communication.
Check section 7 Modbus RTU Communication.