Ski Tow - Power Supply

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   greetings speakerplans, 
i am longer active here but never register yet. 
i was building 2 superscooper in 2010 from the plans here. 
till yet everything was fine, this weekend we play on the mountain at a freestyle ski and snowboard contest. the organisation team told me we will get the power supply from a ski tow station (i dont know if its the right word) 

well i am just afraid of the peaks provided if the lift have to stop and start again. 
somebody have an advice how to take out the peaks? 
i am just a little bit afraid my cone get damaged or the amp (using void infinte 8 with v18-1000) 

can i use a UPS used for computers and stuff? to buffer the peaks by the battery? 

thanks in advance. 
shizzle soundsystem

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steppingraz0r Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 25 March 2013 Location: Österreich Status: Offline Points: 3	Post Options Post Reply Quote steppingraz0r Report Post Thanks(0) Quote Reply Topic: Ski Tow - Power Supply Posted: 25 March 2013 at 9:05am
	greetings speakerplans, i am longer active here but never register yet. i was building 2 superscooper in 2010 from the plans here. till yet everything was fine, this weekend we play on the mountain at a freestyle ski and snowboard contest. the organisation team told me we will get the power supply from a ski tow station (i dont know if its the right word) well i am just afraid of the peaks provided if the lift have to stop and start again. somebody have an advice how to take out the peaks? i am just a little bit afraid my cone get damaged or the amp (using void infinte 8 with v18-1000) can i use a UPS used for computers and stuff? to buffer the peaks by the battery? thanks in advance. shizzle soundsystem

Earplug Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216	Post Options Post Reply Quote Earplug Report Post Thanks(0) Quote Reply Posted: 25 March 2013 at 9:56am
	They use batteries to power the ski lift? If so, what sort of inverters have they got? A modified sine wave might effect some of your gear, but should be ok with the infinite 8 (it has a nice big transformer on it, no?). Edited by Earplug - 25 March 2013 at 9:57am
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steppingraz0r Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 25 March 2013 Location: Österreich Status: Offline Points: 3	Post Options Post Reply Quote steppingraz0r Report Post Thanks(0) Quote Reply Posted: 25 March 2013 at 11:31am
	no they dont use batteries to power the lift, they have power there just when the lift switches on or off there will be a peak (saw it on a bigger lift already when switching on - it cut a power of a whole hotel) thats why i ask for some gear which i can plug before to take out the peak, like a ups battery or something.

studio45 Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864	Post Options Post Reply Quote studio45 Report Post Thanks(0) Quote Reply Posted: 25 March 2013 at 1:28pm
	You would need an "online" UPS, which rectifies the mains to DC, charges batteries and at the same time re-synthesises a clean sine wave for the output, regardless of what the input is doing. If the mains drops out or peaks this will not be transmitted to the output. A normal offline UPS may still have some disturbance on its output if presented with a short duration peak or dropout as it has to switch over to battery operation and back. Also be aware of "single use" surge protectors which are effectively useless after absorbing one surge. Don't ski lifts run more or less continuously though? You could just make sure to unplug your gear when they start it up in the morning and shut it down at night?
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Earplug Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216	Post Options Post Reply Quote Earplug Report Post Thanks(0) Quote Reply Posted: 25 March 2013 at 1:30pm
	What about just using a generator?
	Earplugs Are For Wimps!

J.S. Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 07 February 2006 Location: Poland Status: Offline Points: 29	Post Options Post Reply Quote J.S. Report Post Thanks(0) Quote Reply Posted: 30 March 2013 at 1:59pm
	Get something like this: EMI FIlter in your power cable path and stop worrying :) Edited by J.S. - 30 March 2013 at 2:02pm

Earplug Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 03 January 2012 Location: Europe Status: Offline Points: 7216	Post Options Post Reply Quote Earplug Report Post Thanks(0) Quote Reply Posted: 31 March 2013 at 2:13pm
	A filter won´t help if the power keeps cutting out. UPS or generator.
	Earplugs Are For Wimps!

csg Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 17 September 2007 Location: bedford Status: Offline Points: 6086	Post Options Post Reply Quote csg Report Post Thanks(0) Quote Reply Posted: 31 March 2013 at 2:24pm
	I should imagine that the power supply running the lift will be very stiff as the starting/ stall currents will be very high. All modern lift systems also have a ramped or slow start, so I should imagine that the supply is fairly stable and unlikely t cause any issues. Companies like dopplemayr don't mess around!
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cilla.scope Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Legs all the way to her bottom.... Joined: 02 October 2009 Status: Offline Points: 2954	Post Options Post Reply Quote cilla.scope Report Post Thanks(0) Quote Reply Posted: 31 March 2013 at 11:53pm
	What CSG said, they don't just bang the motor in DOL (direct on line) but will have a fairly monstrous SCR drive to ramp it in slowly, combined with an incoming supply as thick as your leg. Don't swaet it dude, that supply will be fine.
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brad82 Members Profile Send Private Message Find Members Posts Add to Buddy List New Member Joined: 30 June 2013 Location: Middlesbrough Status: Offline Points: 5	Post Options Post Reply Quote brad82 Report Post Thanks(0) Quote Reply Posted: 18 July 2013 at 12:20am
	Hi All, I've lurked on this forum for a while now and this thread caught my eye so I thought id put in my thoughts... I worked as a lift mechanic back when I was a ski bum, and I wouldn't hesitate to run a decent sized rig off the lift's supply, assuming its a decent sized drag lift, not a small handle-tow. I'd personally ensure that there is some sort of surge protection in line with your kit, as some of the older lifts focused on more of "comfortable start for the riders" rather than comfortable for the grid and can dirty the supply, although I wouldn't be worried if the lift is newer than 1990ish. I wouldn't bother with a UPS, the supply to the lift will be more than enough to run the lift twice over, a filter like J.S suggested should do. Source: I did the same thing at a ski resort at France a few years ago on a terrain park drag lift... Getting all nostalgic! Doppelmayr weren't too happy when we'd wired a 32A ceeform plug to their pristine German Siemens high voltage cabs, but after lots of wiring diagram checking they signed off the inspection form and although I'm ashamed to say it, the Peavey kit stood up to many stop starts and rocked out for the 2 day event. Best of luck

shagnasty Members Profile Send Private Message Find Members Posts Add to Buddy List Old Croc Joined: 30 July 2007 Location: Guildford, UK Status: Offline Points: 7685	Post Options Post Reply Quote shagnasty Report Post Thanks(0) Quote Reply Posted: 18 July 2013 at 1:44am
	As above, inverter based soft start, supplies of doom, you will be fine. Make VERY sure you don't shut your amps down once you power them up as warm amps cooling will pull moisture in and maybe pop RCDs... You will most prob be given 32A 3PNE as apposed 63A single so make sure you are rigged for 3 phase!