BFL13 wrote:
DrewE wrote:
BFL13 wrote:
You have a 120v fault that is blowing that fuse, so the only thing left is that cord. It is not likely to be where the cord connects to the circuit board IMO. It is more likely to be farther out near the end where it was cut and since then it got wet out there. Perhaps now cut it way back shorter, and splice on the new bit of cord with a plug on it and try again.
The fuse is after the cord; a short in the cord would not cause the fuse to blow because the short circuit current doesn't flow through the fuse, and likewise an open or high resistance in the cord would not cause the fuse to blow because it only could reduce the current that's flowing.
So if the cord were shorted somewhere, it would blow a breaker or fuse at whatever the cord is plugged into, and not on the circuit board the cord is attached to?
The two prong AC cord used for testing is not shorted. So apparently the problem is somewhere on the AC side of the PD9280.
Here a pic of where the three prong cable connected to the PCB
The the plug from the three wire AC was cut off when it was installed.
to test I connected a two prong AC cord to the (hot) black and (neutal) white and used a couple short jumper wires with clips to hold the fuse and connect to the PCB where the fuse was installed.
Pic of the replacement fuse purchased (2x) from DigiKey for $2.17 each plus ~3.50 shipping.
It has the same specs as the fuse that was removed.
Note: the PD9280 when installed after cutting it's three prong cable was connected to the AC dist. panel without any fuse or circuit breaker.
A couple weeks prior to the PD9280 stopped putting out DC some water was spilled in the same area it was spliced and connected to the neutral and ground there was some sparking before I was able to cut off the AC power, dried everything up and reconnected. The PD9280 worked ok for a couple of weeks then stopped working.
So the problem may have been water spillage and/or one of the three batteries was empty of electrolyte which was then removed.
