6.7.4 Excitation Loss Protection (PEL)
This fault is associated with the amount of reactive power which the synchronous machine can absorb. If the
excitation current of the ECW500 falls below 5% of the configured rated value of excitation current for a period
longer than the setting for the protection, an excitation loss fault is generated. The enable/disable parameters
(30436) and the time for the fault to actuate (30296) are available for configuration of this protection.
6.7.5 Terminal Overvoltage Protection (PTOV)
When the voltage at the terminals of the synchronous machine (stator) exceeds the level set in the protection in
relation to the rated voltage value for a set time, the protection actuates and generates a fault warning. The
enable/disable parameter (30442), protection actuation level (30446) and time for actuation (30444) are available
for configuration.
6.7.6 Terminal Undervoltage Protection (PTUV)
When the voltage at the terminals of the synchronous machine (stator) falls below the level set in the protection
in relation to the rated voltage value for a set time, the protection actuates and generates a fault warning. The
enable/disable parameter (30448), protection actuation level (30452) and time for actuation (30450) are available
for configuration.
6.7.7 Power Module Overtemperature Protection
This function aims at protecting the power module of the ECW500 through the monitoring of the temperature on
the semiconductors. If the temperature exceeds the level set for a configured time for protection, a fault is
generated. It is also possible to configure for the ECW500 to shut down the excitation if this fault occurs. Three
parameters are available for the configuration of this protection: temperature level (30428), time for actuation
(30430) and whether the ECW500 must shut down or not the excitation in case of fault (30432).
6.7.8 Power Phase Loss Protection
This protection indicates whether there are problems with phase loss in the power supply of the ECW500. A
parameter to enable/disable this protection (30434) and a time for actuation (30472) are available for
configuration.
6.7.9 Maximum/Minimum Protection Limits of the PWM
It is possible to limit the output of the PWM to both a maximum value and a minimum value. The PWM output is
configurable between -100% and +100% of DC link voltage, through the maximum and minimum PWM output
settings (parameters 30438 and 30440 respectively). This adjust must be done according to the power supply
voltage so as to ensure a proper dynamic for the control regulation. If the maximum trip voltage is at a non-
acceptable level for the excitation, the maximum limit of the PWM must be reduced.
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