Help
  • Explore Community
  • Get Started
  • Ask the Community
  • How-To & Best Practices
  • Contact Support
Notifications
Login / Register
Community
Community
Notifications
close
  • Forums
  • Knowledge Center
  • Events & Webinars
  • Ideas
  • Blogs
Help
Help
  • Explore Community
  • Get Started
  • Ask the Community
  • How-To & Best Practices
  • Contact Support
Login / Register
Sustainability
Sustainability

Join our "Ask Me About" community webinar on May 20th at 9 AM CET and 5 PM CET to explore cybersecurity and monitoring for Data Center and edge IT. Learn about market trends, cutting-edge technologies, and best practices from industry experts.
Register and secure your Critical IT infrastructure

Wrong output frequency 200Hz

APC UPS Data Center & Enterprise Solutions Forum

Schneider, APC support forum to share knowledge about installation and configuration for Data Center and Business Power UPSs, Accessories, Software, Services.

cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Show  only  | Search instead for 
Did you mean: 
  • Home
  • Schneider Electric Community
  • APC UPS, Critical Power, Cooling and Racks
  • APC UPS Data Center & Enterprise Solutions Forum
  • Wrong output frequency 200Hz
Options
  • Subscribe to RSS Feed
  • Mark Topic as New
  • Mark Topic as Read
  • Float this Topic for Current User
  • Bookmark
  • Subscribe
  • Mute
  • Printer Friendly Page
Invite a Co-worker
Send a co-worker an invite to the portal.Just enter their email address and we'll connect them to register. After joining, they will belong to the same company.
You have entered an invalid email address. Please re-enter the email address.
This co-worker has already been invited to the Exchange portal. Please invite another co-worker.
Please enter email address
Send Invite Cancel
Invitation Sent
Your invitation was sent.Thanks for sharing Exchange with your co-worker.
Send New Invite Close
Top Experts
User Count
BillP
Administrator BillP Administrator
5060
voidstar_apc
Janeway voidstar_apc
196
Erasmus_apc
Sisko Erasmus_apc
112
TheNotoriousKMP_apc
Sisko TheNotoriousKMP_apc
108
View All

Invite a Colleague

Found this content useful? Share it with a Colleague!

Invite a Colleague Invite
Solved Go to Solution
Back to APC UPS Data Center & Enterprise Solutions Forum
Solved
Anonymous user
Not applicable

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

0 Likes
5
1853
  • Mark as New
  • Bookmark
  • Subscribe
  • Mute
  • Subscribe to RSS Feed
  • Permalink
  • Print
  • Email to a Friend
  • Report Inappropriate Content

Link copied. Please paste this link to share this article on your social media post.

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

Wrong output frequency 200Hz

Hello Apc experts.

I had an old APC Smart UPS 750VA 500W 230V usb version (SUA750) Not used for sometime and yesterday I changed its batteries with new one. I turned it on and heared the tone then the onlinr (sine wave icon) along with  the left half leds which were dim flashed for about 10 seconds or less then stopped flashing and the battery led indicator kept on the rest were not. I then measured the output voltage and frequency using a Multimeter , it was 230 V and around 200Hz and highly fluctuating AC frequency. I plugged a table lamp just out of curiosity and It worked and the frq. Was the same ~200Hz. Now this is a totally wrong frequency and I guess in might damage my electrical component

I plugged a smal hair dryer and It didn't work, then I plugged a CFL lamp (which I tested and were working) with the hair dryer and the hair dryer worked slowely but the CFL lamp pruduced loud buzzing noise.

What is actually going on? How to fix this frequency issue?

Labels
  • Labels:
  • Smart-UPS & Symmetra LX | RM
  • Tags:
  • output
  • smart
  • sua750
  • up
Reply

Link copied. Please paste this link to share this article on your social media post.

  • All forum topics
  • Previous Topic
  • Next Topic

Accepted Solutions
voidstar_apc
Janeway voidstar_apc
Janeway

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

0 Likes
0
1850
  • Mark as New
  • Bookmark
  • Subscribe
  • Mute
  • Subscribe to RSS Feed
  • Permalink
  • Print
  • Email to a Friend
  • Report Inappropriate Content

Link copied. Please paste this link to share this article on your social media post.

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

A signal is composed of many frequencies -- existence of 200 Hz doesn't mean it's the fundamental. Multimeters are only designed to measure a pure signal. One way they measure frequency is by counting zero-crossings where the signal switches from positive to negative or vice versa. Distortion has higher frequency components that cause more zero crossings. We use oscilloscopes for a more detailed picture than a multimeter can provide.

The frequency of the output waveform isn't set by analog components but rather microprocessor timing, which is why although it's in the realm of possibility I'd be surprised if it were actually 200 Hz.

I'm afraid I can't give much advice on fixing it since the UPS isn't user-serviceable. It contains hazardous voltages stored in the capacitors and can kill you. There may be other people here who can chime in.

See Answer In Context

Reply

Link copied. Please paste this link to share this article on your social media post.

Replies 5
Anonymous user
Not applicable

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

0 Likes
0
1850
  • Mark as New
  • Bookmark
  • Subscribe
  • Mute
  • Subscribe to RSS Feed
  • Permalink
  • Print
  • Email to a Friend
  • Report Inappropriate Content

Link copied. Please paste this link to share this article on your social media post.

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

Any ideas, guys?

Reply

Link copied. Please paste this link to share this article on your social media post.

Anonymous user
Not applicable

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

0 Likes
0
1850
  • Mark as New
  • Bookmark
  • Subscribe
  • Mute
  • Subscribe to RSS Feed
  • Permalink
  • Print
  • Email to a Friend
  • Report Inappropriate Content

Link copied. Please paste this link to share this article on your social media post.

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

No reply guys?

Reply

Link copied. Please paste this link to share this article on your social media post.

voidstar_apc
Janeway voidstar_apc
Janeway

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

0 Likes
0
1850
  • Mark as New
  • Bookmark
  • Subscribe
  • Mute
  • Subscribe to RSS Feed
  • Permalink
  • Print
  • Email to a Friend
  • Report Inappropriate Content

Link copied. Please paste this link to share this article on your social media post.

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

The SmartUPS doesn't have user-service-able parts inside, and isn't designed to put out 200 Hz AC. APC would recommend replacing it.

If your multimeter is correct, that seems like something seriously wrong: either it really is putting out 200 Hz AC or, more likely, the 60 Hz waveform is distorted and the multimeter is measuring the distortion. In the latter case you could try replacing capacitors. I suspect if you're skilled enough to fix the electronics then your time isn't worth it.

Reply

Link copied. Please paste this link to share this article on your social media post.

Anonymous user
Not applicable

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

0 Likes
0
1850
  • Mark as New
  • Bookmark
  • Subscribe
  • Mute
  • Subscribe to RSS Feed
  • Permalink
  • Print
  • Email to a Friend
  • Report Inappropriate Content

Link copied. Please paste this link to share this article on your social media post.

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

Thank you for replying. I believe that my multimeter is correct, it is measuring the correct freq of the mains which is 50Hz here.

when I plug A cfl light it works but plugging a hair dryer wont.

can you specify which capacitors could be damaged? 

Also could there be any thing else other than the capacitors that could change the frequency ?

thank you

Reply

Link copied. Please paste this link to share this article on your social media post.

voidstar_apc
Janeway voidstar_apc
Janeway

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

0 Likes
0
1851
  • Mark as New
  • Bookmark
  • Subscribe
  • Mute
  • Subscribe to RSS Feed
  • Permalink
  • Print
  • Email to a Friend
  • Report Inappropriate Content

Link copied. Please paste this link to share this article on your social media post.

Posted: ‎2021-06-28 04:48 AM . Last Modified: ‎2024-03-18 04:05 AM

A signal is composed of many frequencies -- existence of 200 Hz doesn't mean it's the fundamental. Multimeters are only designed to measure a pure signal. One way they measure frequency is by counting zero-crossings where the signal switches from positive to negative or vice versa. Distortion has higher frequency components that cause more zero crossings. We use oscilloscopes for a more detailed picture than a multimeter can provide.

The frequency of the output waveform isn't set by analog components but rather microprocessor timing, which is why although it's in the realm of possibility I'd be surprised if it were actually 200 Hz.

I'm afraid I can't give much advice on fixing it since the UPS isn't user-serviceable. It contains hazardous voltages stored in the capacitors and can kill you. There may be other people here who can chime in.

Reply

Link copied. Please paste this link to share this article on your social media post.

Preview Exit Preview

never-displayed

You must be signed in to add attachments

never-displayed

 
To The Top!

Forums

  • APC UPS Data Center Backup Solutions
  • EcoStruxure IT
  • EcoStruxure Geo SCADA Expert
  • Metering & Power Quality
  • Schneider Electric Wiser

Knowledge Center

Events & webinars

Ideas

Blogs

Get Started

  • Ask the Community
  • Community Guidelines
  • Community User Guide
  • How-To & Best Practice
  • Experts Leaderboard
  • Contact Support
Brand-Logo
Subscribing is a smart move!
You can subscribe to this board after you log in or create your free account.
Forum-Icon

Create your free account or log in to subscribe to the board - and gain access to more than 10,000+ support articles along with insights from experts and peers.

Register today for FREE

Register Now

Already have an account? Login

Terms & Conditions Privacy Notice Change your Cookie Settings © 2025 Schneider Electric

This is a heading

With achievable small steps, users progress and continually feel satisfaction in task accomplishment.

Usetiful Onboarding Checklist remembers the progress of every user, allowing them to take bite-sized journeys and continue where they left.

of