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The following was received via facsimile:
… The following was received via facsimile:</br>Waterford 3 has observed a higher than expected failure rate of normally energized Tyco model E7024PB electro-pneumatic time delay relays produced since 2007. Seven of the eight failures were observed on 2007 or newer date code relays and one was observed on a 2004 date code relay. Waterford 3 had 33 Tyco model E7024PB time delay relays installed in the plant. The Agastat E7000 series timing relay consists of two basic operating types, On-Delay and Off-Delay. The On-Delay models provide a delay period of contact re-positioning on energization and no time delay upon de-energization. The Off-Delay models provide a delay period of contact re-positioning on de-energization and no time delay upon energization. These relays may be ordered with various electrical characteristics suitable for use specific to each application. The early-in-life failures have been observed on Tyco model E7024PB relays designed as an Off-Delay, 4 pole double throw, 125 VDC operating coil, with a time delay range of 0.5 to 5 seconds.</br>All failed relays were replaced. Post failure bench testing at Waterford 3, Tyco, or independent Failure Analysis has not consistently repeated the failures.</br>See EN #44684 for Part 21 reported by Tyco Electronics. for Part 21 reported by Tyco Electronics. +
05:00:00, 21 April 2010 +
45,862 +
10:35:00, 21 April 2010 +
05:00:00, 21 April 2010 +
The following was received via facsimile:
… The following was received via facsimile:</br>Waterford 3 has observed a higher than expected failure rate of normally energized Tyco model E7024PB electro-pneumatic time delay relays produced since 2007. Seven of the eight failures were observed on 2007 or newer date code relays and one was observed on a 2004 date code relay. Waterford 3 had 33 Tyco model E7024PB time delay relays installed in the plant. The Agastat E7000 series timing relay consists of two basic operating types, On-Delay and Off-Delay. The On-Delay models provide a delay period of contact re-positioning on energization and no time delay upon de-energization. The Off-Delay models provide a delay period of contact re-positioning on de-energization and no time delay upon energization. These relays may be ordered with various electrical characteristics suitable for use specific to each application. The early-in-life failures have been observed on Tyco model E7024PB relays designed as an Off-Delay, 4 pole double throw, 125 VDC operating coil, with a time delay range of 0.5 to 5 seconds.</br>All failed relays were replaced. Post failure bench testing at Waterford 3, Tyco, or independent Failure Analysis has not consistently repeated the failures.</br>See EN #44684 for Part 21 reported by Tyco Electronics. for Part 21 reported by Tyco Electronics. +
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05:00:00, 21 April 2010 +
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