EBME Forums Forums Maintenance Service Manuals & Schematics puritan bennett 760 problem

hi dear friends
i have a problem in Bennett 760 ventilator that it restart during in normal working. the ac mail supply and internal battery situation is ok and EST procedure is passed.
does anybody help me to solve this malfunction?
thanks

I have managed to totally reset one of these vents by using a walkie-talkie near it (in a controlled test situation I might add). They seem particularly prone to RF interference. Was anyone using a radio transmitter or telephone near it at the time?
Robert
PS It went in to fault mode and had to have a total reset before it would operate again.

dear Rojo
it's a good point you have mentioned. but there is no RF source near it.

How many times (and how often, and at what time of day) has this happened, I wonder?

Although you have suggested that the mains power supply is OK, that's where I would suspect the problem might lay. It would be nice to put a UPS in circuit and see (listen) how many times it bleeps!

َActually it's connected to ups and i checked there was no interrupt in power line.
abnormal restart almost happens every 3 min approximately.

How about the output from the UPS? Are you sure it's OK?

Have you actually been alongside the 760 when it re-boots? Any clues from indicator lights etc.?

No doubt you've already checked inside for "bad connections" ... and re-seated boards, and so forth.

Is there any NV-RAM in there? Battery-backed? What's the state of the battery?

the problem solved!
the gear of motor that drive the piston shaft push it very hard, so sometimes the piston does not work probably.

Interesting.

So what was happening ... motor over-load causing a breaker to trip? Or an error signal causing a reset, or partial close-down? Or what?

Lack of maintenance?...oil for example?
Robert

no, i think it happens because of vibration and shaking in bad transportation.