rejoe.koshy
Member
Hello guys,
I have an injection molding machine , which uses a PLC to control its process.After running the machine for few days, one fine morning I suddenly observed that the HMI panel had smoked up.
The HMI unit was dismantled & it was observed that the RS232 communication cable has been completely burnt & HMI was in a inoperable state.It was sent for repair but the OEM has declared the HMI board completely dead, with most its components damaged.
They are telling me that the some leakage currents have found their way in to the PCB & destroyed it, but I am not able to stomach the fact.They are suggesting the use of isolation transformer to prevent such an occurrence, but I have never come across a communication cable getting damaged to this extent due to leakage currents!! & why would it happen suddenly..
Pls help!
I have an injection molding machine , which uses a PLC to control its process.After running the machine for few days, one fine morning I suddenly observed that the HMI panel had smoked up.
The HMI unit was dismantled & it was observed that the RS232 communication cable has been completely burnt & HMI was in a inoperable state.It was sent for repair but the OEM has declared the HMI board completely dead, with most its components damaged.
They are telling me that the some leakage currents have found their way in to the PCB & destroyed it, but I am not able to stomach the fact.They are suggesting the use of isolation transformer to prevent such an occurrence, but I have never come across a communication cable getting damaged to this extent due to leakage currents!! & why would it happen suddenly..
Pls help!