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11-05-2010, 12:53 AM #1
Staging TT300 at high pressure ratio
Hi everybody and greetings from Germany,
we have worked on process cooling units with Danfoss Turbocor TT300 for quite a while. As most of our applications are air-cooled condensers we are operating at high-pressure ratios in summer. We have problems bringing a second or third TT300 in whilst one is already running. Before I provide more details I want to ask if anyone has experience with this szenario and how to solve problems with "Front Radial Bearing Fault".
Thanks for any comments in advance!
Markus
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23-05-2010, 12:12 PM #2
Re: Staging TT300 at high pressure ratio
Hi markus,
did you re-calibrated the bearings, and check the Amps off the bearings. frontbearing for TT300 pin 1-2 (2,75ohm - 3,00ohm) pin 3-4 (2,75 ohm - 3,00 ohm) if this not helps then check the BMCC and/or the PWM modul.
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10-06-2010, 03:09 PM #3
Re: Staging TT300 at high pressure ratio
Hi Marcus,
Staging at high pressureratios is not allowed. You need to respect a maximum pressure ratio of 2.1 before starting additional compressors.
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18-06-2010, 07:59 AM #4
Re: Staging TT300 at high pressure ratio
I don't know how much this helps, but we use electronic gate valves on the discharge line, with a bypass line back to the compressor suction which allows the starting compressor to build up a pressure ratio before opening it to the discharge line, and the rest of the system.
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