Navanod
02-02-2008, 09:33 PM
Hi all,
I'm having this strange problem with this new MCP655-B pump which replaced a leaky old Laing...
The pump was ran using a 12V DC external power supply during leak testing and bleeding. But when plugged into the 480W PSU after everything's alright, it refused to start and simply made small irregular vibrations without moving any water. RPM sensor detected small irregular rpm readings but no movement of water can be observed.
I checked everything and unplugged everything that i can from the PSU thinking the PSU may not have enough juice but that still failed to make it work. In desperation, I hooked it back onto the 12V DC external power supply and it worked! It gets stranger...after running the pump on the DC external power supply for awhile, I decided to give the PSU another shot. This time it worked! But when the system is shutdown'ed and restarted, the same problem resurfaced.
Hence, I had to "jump start" the pump each time for the entire day. I also noticed that although the pump's running, the rpm readers are still going all over the place
The next morning, because I had forgotten to switch the pump to the DC external power supply (its still on PSU), I turned the system on and to my surprise, the pump started! I monitored it for almost a week and there were no problems until yesterday, when the exact same problem returned...
True enough, the DC external power supply was able to jump start the pump once more and the PSU was able to take over. However, this cannot go on forever, esp when it's meant to be for my gal friend! She wouldn't be able to spot the problem if the pump didn't start, and everything will probably cook!
I've asked everyone I knew and no one seemed to know whats wrong and its driving me up the walls and so I had no choice but to turn to the forums. Although I had bought spare pumps, I really do not want to rebleed the loop if I could help it...
updates:
I suspected the PSU didn't have enough juice and had borrowed a variable power source from a friend to test...running it at 12V, the pump failed to work and was drawing only 0.02A for current, but at about 14V, the thing started up for a short while, drawing about 1.5A, then stopped again. Only at 16V did the thing started running...and doing this to jump start the pump and transferring it back to the PSU doesn't always work. Took a few attempts...which I suspect could be dued to the pump needing to warm up.
I've unplugged everything and left only the bare minimal required to boot the system (1 HD and the mobo). I've also tried it on all the 6 molexes on the PSU (Acepower 480W). No go.
I know the pump was rated to run at 12-24V, but now it seemed to require 16V to start...very odd indeed.
Hope this wall of text is not too much for you guys to digest :eek:
I'm having this strange problem with this new MCP655-B pump which replaced a leaky old Laing...
The pump was ran using a 12V DC external power supply during leak testing and bleeding. But when plugged into the 480W PSU after everything's alright, it refused to start and simply made small irregular vibrations without moving any water. RPM sensor detected small irregular rpm readings but no movement of water can be observed.
I checked everything and unplugged everything that i can from the PSU thinking the PSU may not have enough juice but that still failed to make it work. In desperation, I hooked it back onto the 12V DC external power supply and it worked! It gets stranger...after running the pump on the DC external power supply for awhile, I decided to give the PSU another shot. This time it worked! But when the system is shutdown'ed and restarted, the same problem resurfaced.
Hence, I had to "jump start" the pump each time for the entire day. I also noticed that although the pump's running, the rpm readers are still going all over the place
The next morning, because I had forgotten to switch the pump to the DC external power supply (its still on PSU), I turned the system on and to my surprise, the pump started! I monitored it for almost a week and there were no problems until yesterday, when the exact same problem returned...
True enough, the DC external power supply was able to jump start the pump once more and the PSU was able to take over. However, this cannot go on forever, esp when it's meant to be for my gal friend! She wouldn't be able to spot the problem if the pump didn't start, and everything will probably cook!
I've asked everyone I knew and no one seemed to know whats wrong and its driving me up the walls and so I had no choice but to turn to the forums. Although I had bought spare pumps, I really do not want to rebleed the loop if I could help it...
updates:
I suspected the PSU didn't have enough juice and had borrowed a variable power source from a friend to test...running it at 12V, the pump failed to work and was drawing only 0.02A for current, but at about 14V, the thing started up for a short while, drawing about 1.5A, then stopped again. Only at 16V did the thing started running...and doing this to jump start the pump and transferring it back to the PSU doesn't always work. Took a few attempts...which I suspect could be dued to the pump needing to warm up.
I've unplugged everything and left only the bare minimal required to boot the system (1 HD and the mobo). I've also tried it on all the 6 molexes on the PSU (Acepower 480W). No go.
I know the pump was rated to run at 12-24V, but now it seemed to require 16V to start...very odd indeed.
Hope this wall of text is not too much for you guys to digest :eek: