Operation principle and hardware description 31
Smoke detector
The wind turbine converter is equipped with smoke detector to provide additional
protection. The smoke detector is equipped with NC (normally closed) contact which
opens if smoke is detected.
Contact is wired to the digital input 1 (DI1) on the grid-side converter control unit together
with other hardwired faults, for example LCL filter temperature. Smoke detector alarm can
be reset only with auxiliary power reboot. If the converter is started when the smoke
detector alarm is ON, DI1 trip on the grid-side converter will occur after 2 seconds.
In case of smoke detector alarm it is mandatory to check the converter for possible
hardware related issues. Especially LCL filter capacitor requires visual inspection and
capacitance measurement between phases.
Example of wiring connection is shown below.
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