Bitcoin Forum
July 19, 2018, 02:10:44 PM *
News: Latest stable version of Bitcoin Core: 0.16.1  [Torrent]. (New!)
 
   Home   Help Search Donate Login Register  
Pages: [1]
  Print  
Author Topic: Harmonics in electrical system from mining off genset?  (Read 65 times)
VentMine
Full Member
***
Offline Offline

Activity: 230
Merit: 100


View Profile
March 06, 2018, 10:40:57 PM
 #1

Hey guys,

Curious I was talking to a genset vendor today and he mentioned running "server-like" equipment (Antminers) off of a genset may potentially have issues with harmonics and require harmonic conditioning to protect the alternator.

Should I be concerned about this?

1ESSdoVYKm8sNtYMfdkFBajhAe2e6G8keH
Advertised sites are not endorsed by the Bitcoin Forum. They may be unsafe, untrustworthy, or illegal in your jurisdiction. Advertise here.
1532009444
Hero Member
*
Offline Offline

Posts: 1532009444

View Profile Personal Message (Offline)

Ignore
1532009444
Reply with quote  #2

1532009444
Report to moderator
1532009444
Hero Member
*
Offline Offline

Posts: 1532009444

View Profile Personal Message (Offline)

Ignore
1532009444
Reply with quote  #2

1532009444
Report to moderator
1532009444
Hero Member
*
Offline Offline

Posts: 1532009444

View Profile Personal Message (Offline)

Ignore
1532009444
Reply with quote  #2

1532009444
Report to moderator
HagssFIN
Hero Member
*****
Online Online

Activity: 952
Merit: 1143


Electrician. Mining since 2014.


View Profile WWW
March 06, 2018, 10:46:41 PM
 #2

There are always harmonics present when using switched-mode power supplies.

If the harmonics start to be an issue, you can reduce the impact by adding a harmonics filter system in to your electrical system.

NotFuzzyWarm
Legendary
*
Offline Offline

Activity: 1512
Merit: 1064


Evil beware: We have waffles!


View Profile
March 07, 2018, 04:12:47 PM
 #3

Yes harmonics issues are possible if using cheap PSU's. However, most today have PFC - Power Factor Control - that mitigate the problem. Most will advertise if they have PFC and give a Power Factor rating.  A perfect resistive load gives a PF of 1.0 and most PSU's will be around 0.85 to 0.9 or better.

For bitcoin to succeed the community must police itself - Joshua Zipkin aka Joshua Alexander leaked AMT A1 miner skype chats
How a miner mfgr SHOULD operate: HaggsFIN trip to Canaan My info useful? Donations welcome! 1Fuzzyk398kDWVjuC5qPX5v6CjSkvbgAbd
-Support Sidehacks miner development. Donations to:   1BURGERAXHH6Yi6LRybRJK7ybEm5m5HwTr
VentMine
Full Member
***
Offline Offline

Activity: 230
Merit: 100


View Profile
March 07, 2018, 05:26:04 PM
 #4

Yes harmonics issues are possible if using cheap PSU's. However, most today have PFC - Power Factor Control - that mitigate the problem. Most will advertise if they have PFC and give a Power Factor rating.  A perfect resistive load gives a PF of 1.0 and most PSU's will be around 0.85 to 0.9

Ahh k. Thanks gents. So I take it the Bitmain supplied PSU's have this as I recall their powerfactor is 0.95

1ESSdoVYKm8sNtYMfdkFBajhAe2e6G8keH
HagssFIN
Hero Member
*****
Online Online

Activity: 952
Merit: 1143


Electrician. Mining since 2014.


View Profile WWW
March 07, 2018, 05:39:07 PM
 #5

Yes harmonics issues are possible if using cheap PSU's. However, most today have PFC - Power Factor Control - that mitigate the problem. Most will advertise if they have PFC and give a Power Factor rating.  A perfect resistive load gives a PF of 1.0 and most PSU's will be around 0.85 to 0.9

^ This.

More usual case to end up in problems with harmonics is that if you have a lot of load consisting frequency converter controlled electrical motors for example.

So if you use good PSUs with PFC inside, harmonics shouldn't be an issue.

HoleShot
Member
**
Offline Offline

Activity: 70
Merit: 28


View Profile
March 08, 2018, 03:26:06 AM
 #6

I usually measure .97 PF on APW++ PSUs from Bitmain.

You can avoid almost all harmonics issues by avoiding non-resistive loads that use the neutral.

So, run all your power supplies, pumps and fans on 240V, but the coffee pot is fine on 120V.

VentMine
Full Member
***
Offline Offline

Activity: 230
Merit: 100


View Profile
March 08, 2018, 06:34:14 PM
 #7

I usually measure .97 PF on APW++ PSUs from Bitmain.

You can avoid almost all harmonics issues by avoiding non-resistive loads that use the neutral.

So, run all your power supplies, pumps and fans on 240V, but the coffee pot is fine on 120V.


The gen outputs 3-phase, so I have it configured to 230V L-L, 133 L-N. The 240/120 is single phase I believe?

Thanks for the responses guys, I didn't think I needed to worry about filtering but a recent conversation with a genset supplier spooked me.

1ESSdoVYKm8sNtYMfdkFBajhAe2e6G8keH
HoleShot
Member
**
Offline Offline

Activity: 70
Merit: 28


View Profile
March 09, 2018, 07:04:22 PM
 #8

Yes, the 230V/133V is your 3-phase output.

You should connect your miners like this.

A,B legs to miner 1
B,C legs to miner 2
C,A legs to miner 3

Then continue to rotate like this until maximum power is reached. I would not use the neutral. I would not use the single phase output.

Pages: [1]
  Print  
 
Jump to:  

Sponsored by , a Bitcoin-accepting VPN.
Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2006-2009, Simple Machines Valid XHTML 1.0! Valid CSS!