Hello !!

 

One of you can explain to me what is the CPS FREQ (from the electrical display) ?

 

http://benoitcampeau.com/fsx/images/Capture_CPS_FREQ.JPG

 

Thanks,

Ben

 

 

One of you can explain to me what is the CPS FREQ (from the electrical display) ?

 

Frequency in Cycles Per Second (aka Hz).

For convenience, frequency is most often measured in cycles per second (cps) or the interchangeable Hertz (Hz) (60 cps = 60 Hz), named after the 19th C. physicist. 1000 Hz is often referred to as 1 kHz (kilohertz) or simply '1k' in studio parlance.

From the AC generators ?

From the AC generators ?

 

Seeing that DC doesn't have a frequency, that would leave the AC system, yes.

Grab yourself a Physics book or search google and read up on the electricity part. Thats what i done

There's a at least one electrical engineer lurking around here..., and I think the question is why care enough to measure it: Aircraft (and ships) have a 400 Hz AC system and everything is designed to work at that frequency only.  If you see a frequency deviation then you have a problem, usually with the generator drive (IDG). Output frequency from a generator depends on rotation speed, so these generators on each engine have a constant speed drive device that is mechanical and critical to operation.  If you have an problem with one of these you want to take it off line to prevent it from creating more problems (if should go off line itself if problems occur).  See FCOM 6.20 for a discussion of the generator drive.

 

Because the SI unit of measure is a man, Hertz is always capitalized as in kiloHertz.

Thanks Dan,

Very crystal clear explanation... now I understand what this 400 mean on my overhead ;-)

Ben,

So i hear, most pilots don't even bother with either the AC or DC metering panel.

So i hear, most pilots don't even bother with either the AC or DC metering panel.

Dunno about that. I think it's pretty standard to check for proper volts and freqs before bringing a gen online, and a proper load afterwards (in amps). I was sure always taught (and taught others) to.

So i hear, most pilots don't even bother with either the AC or DC metering panel.

In 4 years I've not once used the information from the AC/DC Metering Panel or used the DC/AC Meters Selector, so long as you have two sources of AC power then happy days!

 

The most important switch to flick first thing in the morning is the CAB/UTIL, so you can pop the kettle on in the forward galley and make yourself a cup of tea!!

 

Sam Breese.

In 4 years I've not once used the information from the AC/DC Metering Panel or used the DC/AC Meters Selector, so long as you have two sources of AC power then happy days!

 

The most important switch to flick first thing in the morning is the CAB/UTIL, so you can pop the kettle on in the forward galley and make yourself a cup of tea!!

 

Sam Breese.

 

Selective Quote

Quote

 

Thanks thats what i've been reading.

Good Lord guys... maybe you've never flown an airplane without the built-in protection of the NG (which you probably trust too much)... but you'd only have to connect a bad gen to your electrical system once to understand why you really don't want to. ;-)

But surely if you have a bad gen it won't connect regardless if you check or not?

But surely if you have a bad gen it won't connect regardless if you check or not?

 

If the plane you're flying has that kind of protection, sure.