Negative fuse blown question - Raritan

N

noltj

Member
Joined
Jun 25, 2007
RO Number
26977
Messages
9
Had a Raritan EST 12 installed this season and was having trouble with the negative fuse blowing occasionally. No problem, I would just replace the fuse and it would be ok for a few more weekends. Today the panel was indicating blown negative fuse and when I check the fuse for continuity it checks ok. (5amp fuse)
I replaced the fuse anyway with another new fuse and when I activate the flush the panel again shows blown negative fuse. (yes I did check the new fuse before using it)
I am out of ideas here???????? Help.
Thanks,
Jim
 
what is a negative fuse??? I have never encounterd said device????????
 
It is a 5 amp fuse on the circuit board that when blown triggers the message “negative fuse blown” other then that I have no idea. The important thing in my case is the fuse is good but the system won’t work!!!!!!
Any ideas, help?
 
The most common cause for this is when you are using an external solenoid relay, allowing a toilet to also be flushed by pressing the Start/Stop button on the EST. The external solenoid MUST BE a Raritan solenoid (# CDS12, CDS24 or CDS32, depending on DC system voltage). Other brands of solenoids, particularly the Cole-Hersee that is touted by West Marine, won't work properly and can cause the fuse to blow. The coil amperage on the solenoid must be 1 amp or less, in order for everything to work properly. The guys at West Marine push the Cole-Hersee solenoid, which is very similar in appearance to the Raritan part, because their profit margin is higher on the Cole-Hersee - but so is the amperage draw on the solenoid's coil...
 
Vic, I may be out of my league here. All my heads flush to the holding tank and then I activate overboard treatment by pushing the touch pad, the system then cycles a shot sewage for two minuets from the holding tank. I need to hit the pad a couple of times every so often to keep the holding tank from filling up. ( I just guess at it for frequency) Would this still be the case for the solenoid?

Thanks,
Jim
 
Sorry, I missed your reply. sounds like you have a Hold 'N Treat setup, rather than just the treatment system by itself. Can you gilve me a little more info on how it's connected?
 
Vic, The setup is fairly straight forward, all my heads continue to discharge into the existing 40 gallon holding tank. The Eltro San is piped from the holding tank and I must activate it each time I want it to treat. It does not automatically keep treating until the holding tank level goes down. I must push the button to cycle and it cycles one time per push of the button. The other weekend it continued to give me the “negative fuse blown” display on the control panel. It has a 4-gallon bucket with salt and water lines, and I keep it charged with salt. I had my marina fixit guy on the boat this weekend and it worked every time for him. The fuse was not blown, just shows that on the display. I kept resetting it and with each push of the button it would trip out with negative fuse blown. It has been doing this when I am on the boat the last couple of weekends. I can’t figure out how on a different day the thing worked. I just know when I go down the next week it won’t be working again. I can’t seem to find a smoking gun???

What am I doing wrong?
Jim
 
quote:
Originally posted by pdecat

what is a negative fuse??? I have never encounterd said device????????

Click to expand...


That was also my reaction. Is this a fuse that has bad reactions?

Or maybe it is an anti-fuse?
G
 
Jim, I have one of our technicians looking into it, and when I get an answer, I'll post it.
 
OK, I've got the answer. He said that from the bouncing around of the boat, etc., the fuse sometimes becomes loose in its clips. He said that if you can wiggle it around, remove the fuse and squeeze the fuse clips together a little, then re-insert the fuse. Should be OK after that.
 
Perfect! Thanks Vic
That makes good sense and explains why it was sporadic.

Jim
 
You must log in or register to reply here.
Back
Top