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-   -   new 1.1 compressor blowing 20A fuses (http://www.chiefdelphi.com/forums/showthread.php?t=155037)

fmercier 10-02-2017 09:31

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?

Billfred 10-02-2017 09:36

Re: new 1.1 compressor blowing 20A fuses
 
Quote:

Originally Posted by fmercier (Post 1642896)
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?

Drop us a line at support@andymark.com. We'll take a look and get you running, whether by technical guidance or replacing it if it looks like a dud got through to you. :)

Sent from my desk at AndyMark

FrankJ 10-02-2017 09:54

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.

flemdogmillion 10-02-2017 10:05

Re: new 1.1 compressor blowing 20A fuses
 
Quote:

Originally Posted by FrankJ (Post 1642908)
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.

How much current can the PCM handle in powering the compressor?

rich2202 10-02-2017 10:15

Re: new 1.1 compressor blowing 20A fuses
 
Quote:

Originally Posted by flemdogmillion (Post 1642917)
How much current can the PCM handle in powering the compressor?

The Weidmuller PCM/VRM Connectors are protected by a single 20 amp fuse (shared between the two). So, the combined current of the PCM/VRM cannot exceed 20 amps (I'm guessing that the peak current draw of the VRM is about 4 amps). If you want 20 amps for the PCM alone, then you need to use a WAGO connector with its own 20 amp breaker.

FrankJ 10-02-2017 10:27

Re: new 1.1 compressor blowing 20A fuses
 
Quote:

Originally Posted by flemdogmillion (Post 1642917)
How much current can the PCM handle in powering the compressor?

The PCM has current limiting built in. It is rated for 17 amps continuous. It will allow more for the start up inrush. A bit of history: The older FRC compressors were famous for blowing fuses on the spike relay on start up. FRC allowed replacing the fuse with an 20 amp circuit breaker for that reason. I suspect you have a similar problem.


PCM tech specs here

fmercier 10-02-2017 12:18

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?

Zagar 10-02-2017 12:28

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.

flemdogmillion 10-02-2017 12:33

Re: new 1.1 compressor blowing 20A fuses
 
Quote:

Originally Posted by fmercier (Post 1642963)
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?

Depends on what you use to control the relay.

AllenGregoryIV 10-02-2017 13:58

Re: new 1.1 compressor blowing 20A fuses
 
Quote:

Originally Posted by Zagar (Post 1642968)
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.

This is a little troubling because that would be modifying a pneumatic component which isn't legal.

FrankJ 10-02-2017 14:05

Re: new 1.1 compressor blowing 20A fuses
 
Quote:

Originally Posted by fmercier (Post 1642963)
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?

By rule you can only connect the PCM to the 20 amp fuse connection (R52). I think it is a bad idea to power the PCM from there anyway since you allowed to power is from one of regular circuit breaker connections with a 20 amp circuit breaker (R56). Both cases specify 20 amp protection not 25. I don't like spike relays. The PCM is a way better solution.

FrankJ 10-02-2017 14:10

Re: new 1.1 compressor blowing 20A fuses
 
Quote:

Originally Posted by Zagar (Post 1642968)
...
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.

You can use lots of Teflon tape on the threads to avoid modifying a COTs pneumatic component. It not like there any pressure on the connection.

nathannfm 10-02-2017 14:29

Re: new 1.1 compressor blowing 20A fuses
 
Quote:

Originally Posted by Zagar (Post 1642968)
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.

Quote:

Originally Posted by AllenGregoryIV (Post 1643011)
This is a little troubling because that would be modifying a pneumatic component which isn't legal.

Zagar,

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.

frcguy 10-02-2017 14:33

Re: new 1.1 compressor blowing 20A fuses
 
Quote:

Originally Posted by nathannfm (Post 1643030)
Zagar,

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.

We just ordered and received a 1.1 pump yesterday. How do we know if we have the new filter?

JamesCH95 10-02-2017 14:33

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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