The lift is ready to go next weekend.
Here's the break fork:
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Safety Circuit On Doppelmayr T-bar's
Started by tomcse, Mar 06 2004 01:19 PM
16 replies to this topic
#2
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- Industry II
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Posted 06 March 2004 - 01:21 PM
The coupling box on the traverse:
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#3
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Posted 06 March 2004 - 01:27 PM
The split on the left circuit wire, which leads the current down through the couplingbox and through the break forks, and back up in the circuit wire to the next tower.
The right wire doesn't go through the towers, it's only attached to them.
The whole circuit is serial! One break somewhere on the lift breaks the whole circuit!
The right wire doesn't go through the towers, it's only attached to them.
The whole circuit is serial! One break somewhere on the lift breaks the whole circuit!
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#4
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Posted 06 March 2004 - 01:30 PM
A tower diagram I've painted in Paint shop Pro.
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#5
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Posted 06 March 2004 - 01:32 PM
Now some other photos. Here's the almost complete drive station.
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#7
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Posted 06 March 2004 - 01:34 PM
The info plate on the motor.
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Motor_data.jpg (160.83K)
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#8
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Posted 06 March 2004 - 01:55 PM
Wow, those are some great pictures. I really like how you detailed everything so we can understand how it works.
I can't believe you guys haven't opened up yet. Here in North America were already more than halfway through our ski season.
I can't believe you guys haven't opened up yet. Here in North America were already more than halfway through our ski season.
- Cameron
#10
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Posted 06 March 2004 - 04:59 PM
A simple word of advice... don't grab those bare metal wires (or the brittle forks for that matter) and a path to ground - such as a tower, haul rope or springbox. The 24vdc is enough to give you a little jolt ;) Very nice pictures!! Your brake looks very similar to ours... Only yours is in way better condition!
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- Allan
#11
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Posted 06 March 2004 - 07:58 PM
This is how our T-Bar is wired - All the switches in series with a resistor on tower 6.
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- Allan
#12
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Posted 07 March 2004 - 04:26 AM
That's pretty common, except most aerial lifts have a resistor in parallel with the tower circuit on every tower. The resistor is sized differently for each tower, so the derail detector can tell you which tower the problem's at. I don't know what kind other manufacturers use since I'm no longer a lift electrician, but Riblet used adjustable resistors to ensure the readout was correct.
Member, Department of Ancient Technology, Colorado chapter.
#13
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Posted 07 March 2004 - 05:48 AM
Each resistor is adjustet to a unique resistance. When a switch breaks, the current will pass through the resistor instead. It's a resistor on the return station which connects the two air wires and makes the circuit complete. I don't remember, but I think it's between 400-600 ohms.
On march 13th the lift opens. At last! The installation took much longer time than expected. This T-bar replaces the identical T-bar that was sold in 1997. The resort has been dead since 1996.
On march 13th the lift opens. At last! The installation took much longer time than expected. This T-bar replaces the identical T-bar that was sold in 1997. The resort has been dead since 1996.
#14
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Posted 07 March 2004 - 08:10 PM
I believe what your seeing is poor mans Wheatstone Bridge circuit to help with tower derail switch location. Often these circuit boards are coated epoxy and placed inside the tower crossarm for derail switches. The circuit is used in this application because of it's accuracy of output. Different resister sets are used for different towers. The more experienced lift mechanics will tell you they can be "somewhat" accurate but not "……..exactly" accurate. Usually exactly has a swear word attached to it.
This site has a Wheatstone Bridge that is interactive. In this case the resisters can be adjustable rather than fixed.
http://www2.eng.cam....one/Bridge.html
Ryan B
This site has a Wheatstone Bridge that is interactive. In this case the resisters can be adjustable rather than fixed.
http://www2.eng.cam....one/Bridge.html
Ryan B
www.ropetech.org
#15
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Posted 07 March 2004 - 08:47 PM
We have resistors on the Red chair - which has this resistor setup. It's useless. However, Silverlode also has a resistor setup and it's bang on when we test it - but that system is only a couple years old.
- Allan
#16
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Posted 10 March 2004 - 02:01 PM
Allan, on Mar 6 2004, 04:59 PM, said:
A simple word of advice... don't grab those bare metal wires (or the brittle forks for that matter) and a path to ground - such as a tower, haul rope or springbox. The 24vdc is enough to give you a little jolt ;)
This is nothing to worry about on our Doppelmayr. You can't even feel the current when you grab the wires...
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