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Old 12-01-2011, 07:19 PM   #21
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Brings back memories.... Not much room to work on things, and at least your span seems to be centers enough you can still use a tug to bring her back!!! When we replaced the motors, we speced them with longer tailshafts and used standard drum-style brakes on the motors... Are the brakes mounted on input to trans, or after gear reduction? Lots of torque difference between the two....

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input side - on the rear of the motor

I wish they were on the output side
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Old 12-01-2011, 07:24 PM   #22
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last one we barged off was whole
The span, brake house, retired ring gear, the top five foot of concrete, old span cabling...... You know, PIECES.

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Old 12-02-2011, 01:09 PM   #23
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I am not sure I understand this at all. One VFD for two opposing motors? How can that be. Or am I not understanding?
Secondly. A VFD to operate a brake coil? A separate VFD for each brake? What am I missing here?

I would envision each motor having its own VFD and each VFD supplying a signal to turn on and off the brake for each motor. The VFD can turn on an output. The output can energize a contactor or relay to energize the brake.
You cannot use a brake motor on a VFD unless you separate the brake from the VFD motor output.
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Old 12-02-2011, 01:35 PM   #24
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I am not sure I understand this at all. One VFD for two opposing motors? How can that be. Or am I not understanding?
Secondly. A VFD to operate a brake coil? A separate VFD for each brake? What am I missing here?

I would envision each motor having its own VFD and each VFD supplying a signal to turn on and off the brake for each motor. The VFD can turn on an output. The output can energize a contactor or relay to energize the brake.
You cannot use a brake motor on a VFD unless you separate the brake from the VFD motor output.
One VFD for each motor. At first the brakes ran off of the motors VFD. They now have their own VFD. Just one for both brakes. The idea to use the motors vfd to fire a contactor woulda been smart.
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Old 12-02-2011, 03:52 PM   #25
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this is a photo of the ring gear....
Looking at the bigger picture, it almost looks like there's a weld broken along the inside circumference of the gear, is that right?

-John
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Old 12-02-2011, 04:14 PM   #26
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Looking at the bigger picture, it almost looks like there's a weld broken along the inside circumference of the gear, is that right?

-John
Hey John--
Wasn't tryin' to cut you off yesterday... Hope it wasn't taken that way.... Looks to me like broken weld, also.... VERY bad news on railway swing span!!!

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Old 12-02-2011, 08:28 PM   #27
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Looking at the bigger picture, it almost looks like there's a weld broken along the inside circumference of the gear, is that right?

-John
Beauxcoup brroken welds concrete is busted out even more to facilitate repairs. When it binds up it breaks cogs, concrete, welds, anything it can. If its in full speed motion and the brake slams shut, it breaks whatever it wants.
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