
Soft-starts at high altitudes
#1
Posted 28 June 2004 - 09:38 AM
The specifications of the soft-starters I know of are rated as follows: "above 1000m derate linearly by 1% unit of full load current per 100m to a maximum altitude of 2000m."
Does the derating change above 2000m or it is impossible to use it at those altitudes?
#2
Posted 28 June 2004 - 11:28 AM
Welcome to the forum.
Yes it is very possible to operate soft starters at higher than 2000M. I have done with not problems.
The issue is that the air get less dense with altitude and therfore the cooling efficiency drops.
Standard rules are used, but are not correct. You really need to calculate the rating based on the altitude and starting conditions.
Companies like AuCom Electronics, NHP and Danfoss have software that will allow these calculations.
I suggest that you contact your supplier and see if they can help. If not, find a supplier that can.
Best regards,
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
#3
Guest__*
Posted 01 July 2004 - 09:46 PM
#4
Posted 04 July 2004 - 07:28 PM
The soft starter does not change the power factor of the motor during start.
Best regards,
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
LMPForum | Power Factor | L M Photonics Ltd | Empson family | Advanced Motor Control Ltd | Pressure Transducers | Smart Relay | GSM Control | Mark Empson Website | AuCom | Soft Starters
#5
Posted 03 August 2004 - 08:38 PM
At 2000m, rated equipment voltage must be lowered by 11.5%, so if it was a 600V design, the maximum voltage is still 531V. If operating at say 380V this is not a problem. However if it is a max. 415V design it gets derated to only 367V.
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