rejoe.koshy
Member
Hey Guys,
I have had a recent experience of case of SMPS failure. It was a SITOP (siemens) unit which abruptly failed and was replaced by another one. But unfortunately issue recurred within 2 hours of its functioning. The input voltage readings recorded are as under:
Phase - Neutral = 230 V
Phase - Earth =110 V
Neutral - Earth = 120 V
The 230 V is fed from a isolation transformer which was removed from the circuit and the readings returned to normal. Now this is two part query:
1. How do I technically justify the above readings? How can I get phase - earth as 110 V and if N-E is 120 V , how come P-N is 230V?
2. What effect does this have on the health of the SMPS?
Please help me to understand this case, which will facilitate in preventing future failures
I have had a recent experience of case of SMPS failure. It was a SITOP (siemens) unit which abruptly failed and was replaced by another one. But unfortunately issue recurred within 2 hours of its functioning. The input voltage readings recorded are as under:
Phase - Neutral = 230 V
Phase - Earth =110 V
Neutral - Earth = 120 V
The 230 V is fed from a isolation transformer which was removed from the circuit and the readings returned to normal. Now this is two part query:
1. How do I technically justify the above readings? How can I get phase - earth as 110 V and if N-E is 120 V , how come P-N is 230V?
2. What effect does this have on the health of the SMPS?
Please help me to understand this case, which will facilitate in preventing future failures