need some help for 324 control module..

[Tridac]

Error 404

Assuming the original design was done right, the real question is: Why the parts are burnt out now and what caused it ?. Don't have a schematic handy, but assume the module drives a relay to switch the pump supply ?. If so, might be worth checking or replacing the relay, otherwise the intermittent short could happen again. If not, might be worth adding a relay, to minimise stress on the module...

[ziopinulo]

Assuming the original design was done right, the real question is: Why the parts are burnt out now and what caused it ?. Don't have a schematic handy, but assume the module drives a relay to switch the pump supply ?. If so, might be worth checking or replacing the relay, otherwise the intermittent short could happen again. If not, might be worth adding a relay, to minimise stress on the module...

the module is connected directly to the pump, is a relay it self but you can add another in series. it may be an idea to safeguard it, but i think that if all is in good condition the module work well

[UrS4boy]

the module is connected directly to the pump, is a relay it self but you can add another in series. it may be an idea to safeguard it, but i think that if all is in good condition the module work well

I have created the diagram below for the S2s and RS2s based on S2Central's S2 wiring pdf . In doing so, I discovered two things:

1. The C4 UrS J69 (214) fan relay is called a J138 on the S2.
2. There is a resistor (N47) in series with the fan in Stage 1 that my C4 UrS diagram did not show.

As a result, if a S2 after-run fan is not coming on but the V51 After-run pump is coming on, you need to check the S5 fuse, the S20 fuse, and the N47.



After-run pump System info: http://forums.quattroworld.com/s4s6/msgs/21503.phtml

[Tridac]

Had I taken the trouble to look upthread, rather than diving in, I would have realised that :-). One posibility is that the pump startup current is excessive, due to bearing wear, or its clagged up with muck. From the photo, it's quite a small power transistor driving the pump, with little or no heat sinking, so the original design may have been a bit close to the edge anyway. Looks like there's enough room inside the module for a miniature relay, which would avoid loom changes. May have a go at this soon, then report back with photos...

[ziopinulo]

Had I taken the trouble to look upthread, rather than diving in, I would have realised that :-). One posibility is that the pump startup current is excessive, due to bearing wear, or its clagged up with muck. From the photo, it's quite a small power transistor driving the pump, with little or no heat sinking, so the original design may have been a bit close to the edge anyway. Looks like there's enough room inside the module for a miniature relay, which would avoid loom changes. May have a go at this soon, then report back with photos...

the small power transistor dont have heat sinking in fact..
await your news!

[Tridac]

Bd435

Just pulled the data sheet for the transistor and it's only a piddly little 4 amp device and not vey high gain at that, especially at low temperatures. If you are going to replace it, pick a 10 or 15amp device, perhaps even a darlington, to make sure it is always fully turned on. Something like a Texas TIPxx series, which has a slightly larger outline and a full metal tab to spread the heat, or to mount a heatsink.

A relay would still be best though, as it provides electrical isolation between the pump motor and the rest of the circuit...