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new 1.1 compressor blowing 20A fuses
I am a mentor with Team 3329. We had to replace our compressor this year and went with the new 1.1 from AndyMark. It is connected directly to the PCM, but it is blowing the small 20A fuses on the PDB. We've checked the wiring into the PCM, and have even replaced the pressure switch. Any suggestions?
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Re: new 1.1 compressor blowing 20A fuses
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Sent from my desk at AndyMark |
Re: new 1.1 compressor blowing 20A fuses
Rule R56 allows the PCM to connected to a circuit breaker the PDB rather than the fused circuit. This will not fix a bad compressor but at least it will not blow the fuse that you VCM and robot radio is connected to.
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PCM tech specs here |
Re: new 1.1 compressor blowing 20A fuses
Two questions:
If I go from compressor to a spike relay to PDB (20A fuse), would it work (no CAN connection)? Would I damage the PCM if I try a 25 A mini fuse? |
Re: new 1.1 compressor blowing 20A fuses
Question for you: Did you install the replacement filter that Andymark sent out? The smaller diameter black one that is deeper?
If so, did you cut about 3 threads off of the part that screws into the compressor? If not, the length of that threaded stem is so long that it will bind into the compressor crankshaft. This could be binding the motor so much that you're blowing fuses. Thankfully I noticed this before installing the filter, and after some cutting and checking and cutting and checking, removing 3-4 threads safely clears the crankshaft, while still allowing a nice secure fit to the compressor. |
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Thank you so much for pointing this out, we have been getting a few reports of blown fuses in 1.1 pumps and were not sure of the cause until now. We will be sending an email to customers who received the replacement filters about this issue shortly recommending the use of a washer and/or PTFE tape to prevent the threads from interfering with the crank shaft without modification of the filter. |
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Re: new 1.1 compressor blowing 20A fuses
@OP:
1) Replace the wiring to the PCM, and PCM to PDB 2) Us a replacement fuse from a known good source, or at least a different one, and ensure that it is FULLY SEATED 3) Double check that you are not exceeding the duty cycle of the compressor Per the 'modifying a pneumatic component' discussion. How is a venting filter, which retains/controls/stores no compressed air at all, a pneumatic component? I am confused, please enlighten me. |
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From a safety point of view: its trivial. From a strict reading of the rules you cannot modify pneumatic components. |
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Everyone who purchased a 1.1 pump will end up, when all said and done, with the filter on the far left of this graphic. Full disclosure this is the timeline: We received 1 shipment of pumps with the filter on the left before kickoff. These sold out in a few weeks and we put the website out of stock until our second shipment arrived. We started sending out pumps from this second shipment without checking to see which filter was included. After a few days we realized that this second shipment had been packed with the grey filter on the right. As soon as we realized this we turned them off on the website, purchased the filter in the middle from a 3rd party and mailed out one per pump to everyone who had bought a pump that was from the second batch. When those people were taken care of we removed and threw out all the grey filters from boxes in inventory and replaced them with the 3rd party filter pictured in the middle. We then received a box of the small black filters from our supplier to make up for the ones they packed incorrectly. Today we realized the thread length issue and as of 4pm 2/10/17 if you order a 1.1 pump it will come with the small black filter pictured on the left. Right now we are in the process of identifying everyone who ordered a pump from the second shipment and sending out the original, small, black, filter pictured on the left. We strongly recommend that once you receive the small black one you switch it. We have confirmed that there is not an interference problem with this filter as you can see in the pictures below: ![]() Good filter installed on the back plate of the pump not protruding inside. ![]() Bad 3rd party filter sticking past the back plate of the pump to the inside. If you wish to use the larger black filter until your replacement arrives you should only install it 3 full turns. To assist in this you can wrap the threads in PTFE/"plumbers"/"Teflon" tape so that it will get tight before it bottoms out. |
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Thanks for the info! It would appear we got one of the bad filters. Awaiting the new one's arrival! |
Re: new 1.1 compressor blowing 20A fuses
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Instructions show 10 and 20 amp mini fuses http://wpilib.screenstepslive.com/s/...control-system Quote:
https://firstfrc.blob.core.windows.n...nChecklist.pdf |
Re: new 1.1 compressor blowing 20A fuses
To the original post, only one PCM needs to be connected to the PDP output. A second PCM can be wired to a normal output of the PDP under R56. If you use a Spike relay, it can be wired directly to the PDP as long as it is controlled by the RoboRio. No PCM is used to power the compressor but one is needed for sensing the pressure switch.
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