ML1500 CPU burns out frequently

lalprasob · Jul 29, 2012

Hi friends........i am facing the following problem with ML1500 LSP CPU....ML1500 CPU in my system burned out 2 weeks before...i changed the CPU...Within 18 Hours , the same problem repeated..Then i checked all wiring and earthing and installed new one....it worked for 13 days...After that the same burning problem repeated.......i cant find out the reason....pls help me..
System configuration is- ML1500 LSP Series C, 28BXB base , 3 IQ32 and 3 OB32 ( total of 6 modules connected with CPU )...no PA2 used...

Mickey · Jul 29, 2012

Can you please define "Burned out".

lalprasob · Jul 29, 2012

checking the PLC CPU after failure, it has been found that the Chip inside the CPU completely blasted..

Mickey · Jul 29, 2012

Are you powering the outputs with the same power supply as the CPU?
If so do you have surge protection on all inductive loads?

chavak · Jul 29, 2012

Welcome to the forum,

I understand "God's own country" is infamous for frequent power outrages and voltage fluctuations.

You may need some considerations to have a steady supply to the PLC.

Regards

lalprasob · Jul 31, 2012

Hi Mickey,
I am using 3 SMPS's. one for PLC CPU, one for all digital inputs , one for all digital outputs...I have not used any surge protection circuits.......I have provided UPS for SMPS of PLC CPU only.....is this configuration will create any problem?..pls reply

Mickey · Jul 31, 2012

lalprasob said:
Hi Mickey,
I am using 3 SMPS's. one for PLC CPU, one for all digital inputs , one for all digital outputs...I have not used any surge protection circuits.......I have provided UPS for SMPS of PLC CPU only.....is this configuration will create any problem?..pls reply

Here is a guide for you. See PDF

lalprasob · Jul 31, 2012

if temperature will be a factor for this type of PLC failure? When i observed the temperature of PLC CPU during operation, i got the value above 45 degree celcius......The PLC system is installed in the harsh environment of a steel plant where temperature is always high...Air conditioner installed in the PLC room was not in a working condition during this PLC failure.....

Mickey · Jul 31, 2012

lalprasob said:
if temperature will be a factor for this type of PLC failure? When i observed the temperature of PLC CPU during operation, i got the value above 45 degree celcius......The PLC system is installed in the harsh environment of a steel plant where temperature is always high...Air conditioner installed in the PLC room was not in a working condition during this PLC failure.....

See spec

ML1500 CPU burns out frequently

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