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5000-series - Updates

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This afternoon I spotted a 4 car consist of 53 xx heading EB on the Forest Pk branch of the Blue Line.   On the 3rd car, one of the windows was boarded up, with what looked like cameras attached on the outside.   Couldn't get a good look as that train was heading east and I was driving westbound on the Ike.

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On November 30, 2016 at 4:26 PM, chicagopcclcar said:

Testing suspensions for 7000s.  Posted this before. Forest Park branch is the best with its bad track.  Car numbers..#5307-08, 5471-72.

DH   

Oh boy, the irony that I saw that set circling around the Loop on 11/29 around 12:30-1PM.

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The Cubs "W" cars will run next Sunday, 04/23 on "rare territory" including Blue line, Forest Park branch.

DH 

P1150693.jpg

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2 hours ago, chicagopcclcar said:

The Cubs "W" cars will run next Sunday, 04/23 on "rare territory" including Blue line, Forest Park branch.

DH 

P1150693.jpg

Oh yeah, on the blue line. Any particular schedule, and they will be on more than the Forest PK branch? 9_9

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39 minutes ago, BusHunter said:

Oh yeah, on the blue line. Any particular schedule, and they will be on more than the Forest PK branch? 9_9

Are you interested in tickets. You would get to sit down with CTA HEAD HONCHOS, LOL.

DH 

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Not in revenue service? I've already been around a few brass hanging out at most of the cta events. In fact they probably know who I am. You cant bushunt, railhunt and attend events without knowing a few people and the people you do know might gossip about who I am. I've learned quite a bit over the years on who is who at cta. 

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Hi All;

What is the device (or component) on the 5000s which makes that high pitched  sound [usually heard when accelerating out of station for example]?

I've seen the word mentioned on the forum previously but can't think of it. :(

BTW, whatever this device is I think it must be common to electric transit vehicles with AC motors.

Thanks for your help!

 

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6 hours ago, geneking7320 said:

Hi All;

What is the device (or component) on the 5000s which makes that high pitched  sound [usually heard when accelerating out of station for example]?

I've seen the word mentioned on the forum previously but can't think of it. :(

BTW, whatever this device is I think it must be common to electric transit vehicles with AC motors.

Thanks for your help!

 

I posted your question on Subchat. I'll let you know about responses I get.

DH

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On April 24, 2017 at 6:37 PM, chicagopcclcar said:

I posted your question on Subchat. I'll let you know about responses I get.

DH

 geneking7320  Two responders say its the inverter, the device that changes the DC current into AC current. An another person said whistle or hum the first three notes from "There's a place for you" from West Side Story....he says most NYCTA AC railcars make that sound.

EDIT.....Get ready for school....Got this off Subchat.  "

It's the sound of the motors getting AC from the inverters. A standard inverter these days is a PWM beast - pulse width modulation. What it's actually doing is turning on and off the voltage to the motor very quickly (a few thousand times a second). By varying the amount of 'on' time, the drive can approximate a sine wave of any voltage or frequency. The whine is at the 'carrier frequency' of the drive. Due to all sorts of fun considerations, the carrier frequency of the drive gets adjusted up and down by the control electronics, as needed. Contrary to what's been written in places, both IGBT and GTO inverters change carrier frequency.

The actual drive makes a little bit of noise, but it's the motors that make the bulk of the noise.

Various manufacturers do things differently, resulting in different noises. Also, what the drive is trying to make the motor do, can dictate the noise. This also creates electrical noise, so there's typically filters on one or both sides of the inverter. There's also typically a converter and DC-link."

DH

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