Question about power switches

Meshal
Posts: 14
Joined: Wed Nov 27, 2013 10:17 pm

Question about power switches

Postby Meshal » Wed Feb 19, 2014 3:48 am

I'm going to put a power switch on each power supply on my DIY laser machine, but before to do that I need to know the maximum INPUT current (AC) for these PS's so that I can select a proper current rating for these switches, the following power supplies are :

1- 80W PWM CO2 Laser Power Supply (220V) ------- (SN/ LSR-JN80WCO2-2)
2- Dual DC 36V & 24V 10A Switching Power Supply ------- (SN/ EPS-D3624V10A)
3- DC 24V 5A Switching Power Supply ------- (SN/ EPS-D24V5APS)

Thanks

Tech_Marco
Posts: 4372
Joined: Mon Jun 15, 2009 3:00 pm

Re: Question about power switches

Postby Tech_Marco » Fri Feb 21, 2014 10:07 am

Laser only have 10% efficiency. So, 80W peak power means that it take 800W

Considering fully loaded:
1) 800W
2) 360W+120W
3) 120W

Total: 1400W x 20% extra = 1680W

If it is driven by AC110V, the current is 15.3A (16A)

You may want to use a Relay to seves as "switch" as it is hardly you can find a single switch capable to handle over 15A. And, it is not "safe" to swith On/Off of such high current loading by hand. Attach a small switch (any switch that capable to handle 1A current: easy to find) to turn the Relay On and Off, which in turn to turn the machine On or Off. Follow me?

You may also consider a Sold Relay (SSR) 25A for less than $10 on my site (need to get heatsink as well). It needs DC source 3~36V to turn it On which is easy to get it from current the system.


Marco

Meshal
Posts: 14
Joined: Wed Nov 27, 2013 10:17 pm

Re: Question about power switches

Postby Meshal » Sat Feb 22, 2014 7:24 am

So helpful , thanks Marco for the clarification and infinite support !. :D


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