A53 Z0 9 0020 L En Technical documentation
Chapter : Dedicated I/O lines
2/ Working of pulse or an undervoltage coil
For control using a pulse or an undervoltage coil, the necessary parameters are:
[E1893]: pulse length.
[E1994]: Undervoltage coil delay. This sets the time between the opening of the breaker and the
closing of the undervoltage coil control contact.
[E1995]: Undervoltage coil pause time. Sets the time between the closing of the undervoltage trip
coil control contact (E1 or E4) and another breaker close request by the other contact (E2 or E5).
This must be longer than the breaker reset time.
These values can be modified in the “Configuration/ Modification by variable n°” menu.
Figure 48- Undervoltage coil
WARNING:
Never switch from one mode to another when the plant is in use. An unwanted breaker state
modification may occur.
3/ Close breaker condition
To close the generator breaker the following conditions have to be met:
Voltage must be between 70% (parameter E1432) and 130% (parameter E1433) of the nominal voltage
(parameter E1107 or E1108).
Speed must be between 70% (parameter E1434) and 130% (parameter E1435) of the nominal speed
(parameter E1080 or E1081).
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