How important are fuses and where should I put them?

[setlab]

I am building my contoll cabinet now and am thinking about fuses. Do I want them and where should I put them?

I have an acorn board running 3 stepper online CL57Y drivers that supposedly draw 5 amps each.

Similar Threads:

• X4 Fuses
• where can i get these fuses
• Blowing fuses
• Blown Fuses
• Blowing the fuses

[mactec54]

I am building my contoll cabinet now and am thinking about fuses. Do I want them and where should I put them?

I have an acorn board running 3 stepper online CL57Y drivers that supposedly draw 5 amps each.

Unless they are light loads you want to use circuit breakers in your cabinet all main supplies Ac or Dc should have a Breaker or Fuse rated for load plus 150%

[Al_The_Man]

A big help is a copy of NFPA79 "Electrical Standards for Industrial Machinery"
You can find a copy in PDF out there on the web, may be a little dated, but most still applies.
Al.

[setlab]

So say I have your standard mean well DC power supply, I would want a breaker or a fuse between its output and my drivers that can do 150% of the output?

My driver power supply is a 48v 21a DC supply, is that considered bigger than a light load?

I'll look around for the regulation book.

[Jim Dawson]

Just to clarify, since your drives are rated at 5 amp input, you would want about a 7 amp slow-blow fuse between the power supply and each drive.

[Al_The_Man]

So say I have your standard mean well DC power supply, I would want a breaker or a fuse between its output and my drivers that can do 150% of the output?
.

Just as an aside, I much prefer linear power supplies due to their extra ruggedness.
You do not need a regulated supply for steppers-servo's
If, or when they fail, SMPS are much harder to fix.
I would rather pay a little more, out of the gate for reliability.
Just my 2c
Al

[AnshKUM]

Yes, you have to put the fuse in the circuit, Fuse should be fast blown before the acorn board supply.
rest you can go with MCBs, But fuse is more responsive.