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| Meridian Systems Welcome to the Nortel Meridian Forums Including Meridian Options 11-81C CS1000M Meridian Mail Call Pilot Companion and Sucession Hospitality OTM MAT MICB RAN NetGateway ..., and all other Applications |
| Tags: cards, nt6d41, power, question, supply, vintage |
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 07-13-2004, 06:24 AM | #1 (permalink) | ||||||||
| Guest
| Ok, this is a question that will separate the Nortel Geniuses from the wannabees: For the second Sunday in a row I have had a major failure on an Option 81 switch and both times it involved the failure of a CE D/C Power Supply Card (NT6D41AB). For me this is a bizarre coincidence considering our long MTBF's on these switches. To add a another mystery to this equation during the second failure we also blew all five breakers on the five loops of Meridian Mail - separate power (except for 48V from batteries) and separate devices but simultaneous failures. I know that the power supply cards are all about 12 years old and the last letters of the card indicate the vintage. These were NT641AB cards which are newer than NT641AA cards but much older than the current NT641AD cards. Here are my questions: * Does anyone know about failures on these cards or specifically cards of this vintage? * Does anyone pro-actively replace these cards when they get old? I am wondering if I should replace the other NT641AB cards on my other switches that were installed at the exact same time. I really don't want any more failures like these because the power failures occur so quickly that the active core cannot transfer to the back-up and we get a full-blown general failure with no phones working. Thanks in advance.  SD | ||||||||
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| 07-13-2004, 06:33 AM | #2 (permalink) | ||||||||
| Guest
| QUESTION RE: Vintage CE D/C Power Supply Cards (NT6D41 AB) ADDENDUM: By the way, one system is on brand new power supply and batteries and the other is on a twelve year old power supply and batteries. This makes it harder for me to blame the power system as the cause for these failures. SD | ||||||||
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| 07-13-2004, 11:11 AM | #3 (permalink) | ||||||||
| Senior Member  
Location: Somewhere in this vast universe on a little rock that looks like a grape. Rep Power: 11  | SD, did you recieve any PWR MSGs before the failure? Did you notice any "floating" on the rectifier? One more thing, did just the loops fail or did the MerMail fail as well? __________________  I'm a member of the "PbxInfo Gang" | ||||||||
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| 07-13-2004, 12:19 PM | #4 (permalink) |
| Junior Member | Ouch!!! that will put a relaxing weekend to a sudden hault  I have seen problems with the front panel power switches going bad on these cards. When my first one went bad I ended up blowing 2 more before I finally was told not to turn on the shelf with the switch that is on the power supply, by that time I was out of power supplies and had to bypass the switch with a jumper wire. So now I always turn the power supply switch on first then turn on the Breaker for that shelf in the pedestal. It goes against the normal power up procedures however I have had no problem powering them up this way. As far as the MM shelves go have you looked for a fried mouse in the pedestal  |
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| 07-13-2004, 12:19 PM | #5 (permalink) | |||||||||
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| Quote:
On the first one, no. Just WHAM BAM THANK YOU MAME. The only preceding errors in the log were: ERR020 28 0 5 and ERR 080 20 0 7 7 20 So these don't really seem relevant. On the second one we got: 02:57:53 INTRA CONT START 02:57:53 PWR053 XSMC 03 0 0 and later 04:58:01 INTRA CONT START 04:58:01 PWR 004 CRB 00 0 0 04:58:04 PWR 016 PF~| and then BAM! Dead! Now PWR004 is "Circuit breaker has tripped. System has overheated." Action: Check the blower unit, air filter, air ventilation and room air conditioning. And PWR016 is "Power fail transfer has been activated." Alas, we do not have recording of the room temperature on either of these systems so we cannot check it. It would seem unlikely that temperature was a significant factor as there were no HVAC failures during this time. Floating on the rectifier: No, we saw nothing on any of the batteries. Bear in mind that one is very new and the other is very old. One more thing, did just the loops fail or did the MerMail fail as well? In both cases the cores failed and could not be reinstated until someone manually separated the cores and forced the switches up on the non-incident core. MerMail only resided on the second switch and it went down at the same time blowing all 5 breakers. Thanks for the help here! SD | |||||||||
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| 07-13-2004, 12:48 PM | #6 (permalink) | ||||||||
| Senior Member
Location: Somewhere in this vast universe on a little rock that looks like a grape. Rep Power: 11 | Analog Line Card ENLC/DISC I know this is a stretch, but have you checked to see if the fan unit is actually blowing? __________________ I'm a member of the "PbxInfo Gang" | ||||||||
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| 07-13-2004, 01:06 PM | #7 (permalink) | |||||||||
| Guest
| Quote:
So am I out to lunch - does it make sense to look at a 12 year old critical component like a power card and say "Hey that sucker doesn't owe me anything any more and it is bound to die soon; better yank that puppy and put in a new one!"??? I mean we don't expect the batteries and power rectifiers to last forever; we change those before they fail. DOES ANYONE PRO-ACTIVELY REPLACE OLD PARTS BEFORE THEY FAIL??? If so then what criteria? What equipment? SD | |||||||||
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