hi guys
i have just finished a supervision for installing a control system for BAF( Batch annealing furneces) the supplier installed allen bradly Ac inverters in each furnes 1336 plus series 22kw.
after starting up and working for few days the inverters start to blow up one after one without any reason.when i chech for that i found a difference in Amps between the phases in the inverter input specially the first one is much lower than the other two.every thing else is alright the motor the cables,the motor terminator ....etc
Can any one help me and explain why this difference in input Amps. is this could be a reason for damaging the inverters.
N.B this inverters was in the stores 3 years ago may be the capacitors is not in a good condition.
Any comment
i have just finished a supervision for installing a control system for BAF( Batch annealing furneces) the supplier installed allen bradly Ac inverters in each furnes 1336 plus series 22kw.
after starting up and working for few days the inverters start to blow up one after one without any reason.when i chech for that i found a difference in Amps between the phases in the inverter input specially the first one is much lower than the other two.every thing else is alright the motor the cables,the motor terminator ....etc
Can any one help me and explain why this difference in input Amps. is this could be a reason for damaging the inverters.
N.B this inverters was in the stores 3 years ago may be the capacitors is not in a good condition.
Any comment