Comments on: Liebert-CW CRAC Shaft Problems http://www.thegeekpub.com/741/liebert-cw-crac-shaft-problems/ Drink Beer and Geek Out Sat, 10 Dec 2011 15:52:33 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: goran http://www.thegeekpub.com/741/liebert-cw-crac-shaft-problems/comment-page-1/#comment-2561 goran Sun, 30 Oct 2011 21:55:10 +0000 http://www.thegeekpub.com/?p=741#comment-2561 How do you change motor pulley and belt on Liebert unit model DS070ADA000254A? How do you change motor pulley and belt on Liebert unit model DS070ADA000254A?

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]]> By: Engineering Guru http://www.thegeekpub.com/741/liebert-cw-crac-shaft-problems/comment-page-1/#comment-2184 Engineering Guru Wed, 21 Sep 2011 13:02:00 +0000 http://www.thegeekpub.com/?p=741#comment-2184 As with all equipment proper maintenance is vital. On systems with belts, always use a belt tension gauge to verify proper belt tension. Not only will this aid in reducing belt dusting, it prolongs bearing a sheave life as well. I have been using Liebert CRAC units for over 15 years and have only experianced failures due to human error, not design flaw. As with all equipment proper maintenance is vital. On systems with belts, always use a belt tension gauge to verify proper belt tension. Not only will this aid in reducing belt dusting, it prolongs bearing a sheave life as well. I have been using Liebert CRAC units for over 15 years and have only experianced failures due to human error, not design flaw.

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]]> By: BobD http://www.thegeekpub.com/741/liebert-cw-crac-shaft-problems/comment-page-1/#comment-2112 BobD Tue, 30 Aug 2011 15:15:06 +0000 http://www.thegeekpub.com/?p=741#comment-2112 Yo Mama – do ya work for Liebert? Get a life? Forums like this one are how we learn and better understand how things work. This was a real life experience and The Big Geek gave us some great information to ponder. He seems to have worked his problem and came to a conclusion he felt should be shared. I can appreciate he might be wrong in his conclusion – regardless I did learn something I should be aware of in my data centers. Might there be any information or research available on the negative effects of the belt dust and related ‘whiskers’ in the data center. Thanks to The Big Geek for the post and for the effort you put into the problem. Yo Mama – do ya work for Liebert? Get a life?
Forums like this one are how we learn and better understand how things work.
This was a real life experience and The Big Geek gave us some great information to ponder. He seems to have worked his problem and came to a conclusion he felt should be shared. I can appreciate he might be wrong in his conclusion – regardless I did learn something I should be aware of in my data centers.

Might there be any information or research available on the negative effects of the belt dust and related ‘whiskers’ in the data center.

Thanks to The Big Geek for the post and for the effort you put into the problem.

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]]> By: Yo Mama http://www.thegeekpub.com/741/liebert-cw-crac-shaft-problems/comment-page-1/#comment-2097 Yo Mama Thu, 11 Aug 2011 20:29:45 +0000 http://www.thegeekpub.com/?p=741#comment-2097 Liebert makes a great CRAC. If the shaft is failing, you have other problems, i.e. alignment, shaft tension, etc. Starting and stopping shouldn't be a problem, because seriously, how much do you stop and start. Get to work and stop bitching about something you know nothing about. Liebert makes a great CRAC. If the shaft is failing, you have other problems, i.e. alignment, shaft tension, etc. Starting and stopping shouldn’t be a problem, because seriously, how much do you stop and start.

Get to work and stop bitching about something you know nothing about.

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]]> By: Claus Stark http://www.thegeekpub.com/741/liebert-cw-crac-shaft-problems/comment-page-1/#comment-2096 Claus Stark Thu, 11 Aug 2011 18:59:12 +0000 http://www.thegeekpub.com/?p=741#comment-2096 Your belt dust issue comes from the adjustable pully system not from belt slipage. The belts tend to ride on thier sides instead of the bottom of the V because the adjustable system can never be aligned properly. We have over 40 60 ton units at our facility and we got rid of the adjustible pullys and placed a fixed pully on the motor and drive shaft then re-aligned and have reduced the belt dust down by over half. The shaft is breaking and or cracking because the company preforming the maintenance on your units are over tightening the belt tension to help reduce the belt slippage. Not only does this break the shaft but it will destroy the bearings and make the motor run higher than normal currents making energy cost higher. Liebert has since removed these adjustable pullys on thier units and only offer this as an option. Your belt dust issue comes from the adjustable pully system not from belt slipage. The belts tend to ride on thier sides instead of the bottom of the V because the adjustable system can never be aligned properly. We have over 40 60 ton units at our facility and we got rid of the adjustible pullys and placed a fixed pully on the motor and drive shaft then re-aligned and have reduced the belt dust down by over half. The shaft is breaking and or cracking because the company preforming the maintenance on your units are over tightening the belt tension to help reduce the belt slippage. Not only does this break the shaft but it will destroy the bearings and make the motor run higher than normal currents making energy cost higher. Liebert has since removed these adjustable pullys on thier units and only offer this as an option.

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]]> By: Jason Peen http://www.thegeekpub.com/741/liebert-cw-crac-shaft-problems/comment-page-1/#comment-657 Jason Peen Tue, 20 Apr 2010 18:13:20 +0000 http://www.thegeekpub.com/?p=741#comment-657 Hi Mike – I worked for a company a few years ago who I can’t name. But, we had this exact same problem. We called Liebert for support and they denied it. We didn’t replace our pulley system either. This was stock stuff. I think the shafts are designed to fail after a few years. Certainly think it is in their best interest for a lot of parts in their units to fail. Like plastic gears in the condensate pumps. Give me a break.

Hi Mike –

I worked for a company a few years ago who I can’t name. But, we had this exact same problem. We called Liebert for support and they denied it. We didn’t replace our pulley system either. This was stock stuff. I think the shafts are designed to fail after a few years. Certainly think it is in their best interest for a lot of parts in their units to fail. Like plastic gears in the condensate pumps. Give me a break.

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