Boiler fan trip

[SA07]

Good morning

Our power plant stopped following the trip of a boiler fan due to a disturbance on the utility grid.
The fan is controlled by a simocode, soft starter & bypass contactor.
In the past several times, our power plant has islanded following disturbance/fault on the utility grid.
After the trip, we have restarted the plant and everything is working well up to now. We have not replaced any equipment.
1) Can you plz check if our simocode settings are correct?
2) Is the wiring correct?
3) Is the setting of under voltage in the simocode correct?
4) What may be the cause of the trip?
5) Can we disable the under voltage setting in the simocode?
6) Can the last alarm in the simocode alarm list be the cause of the trip? (Trip level U<)
After the boiler fan has tripped, then boiler tripped, then turbine tripped and our line breaker also has opened. So our plant was in a black out.

Plz see attached word doc with all details.
Thanks
Regards

 

[FacEngrPE]

For security reasons you might not want to connect power plant process controls to the internet, Fortunately it is not difficult to set up a local time server.
This is one of many options

https://www.amazon.com/TimeMachines-TM1000A-maintains-broadcast-Satellites/dp/B002RC3Q4Q

 

[SA07]

Power plant control voltage was transferred to industrial UPS with redundancy and automatic transfer switch. It happened that one UPS became faulty in the past and all supply was switched to the redundant UPS without stopping the power plant.