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We have problem in 3 pcs of Eurotherm Thyristor controller (EPower), Drive unit Display is just black seems no power, but Input power is Ok

Dear Support team,

I am working from ABB Sweden as commissioning engineer of high voltage machines.
We have supplied synchronous motor with MCP to Saudi Arabia customer.

We have problem in 3 pcs of Eurotherm Thyristor controller (EPower). Thyristor Controller is not starting up, The display is just black, but the power supply is ok and the internal fans are running,

Vi suspect that an overvoltage on the main Grid of 30% can have caused this but not sure because its 19 pcs of Epower Units on Site and this 3 Units that is “broken is in Same area2 but the Hole Site
were affected buy this overvoltage but only this 3 pcs was “Broken”

Question 1: what should we change the complete unit or just the Drive Unit.
Question 2: Is there any internal fuse in the Drive unit that can be broken ?

EPOWER, 3ph, 160A / 160A / 600V
Sl. NO: PL15550000582-D
Part NO: 3BSM904552-2

Thanks
Best Regards,
Mikael Hammar
ABB Site Rep.
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