What correction factor for - 4 deg C motor rating?
What correction factor for - 4 deg C motor rating?
(OP)
Anyone can suggest what correction factor should be used for -4 deg C ambinet while selecting the AC motor?
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What correction factor for - 4 deg C motor rating?
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RE: What correction factor for - 4 deg C motor rating?
RE: What correction factor for - 4 deg C motor rating?
RE: What correction factor for - 4 deg C motor rating?
-4 deg C isn't all that cold anyway. Any if you a have motor space heater, it wouldn't be -4 in the motor.
But I await correction from the motor experts.
RE: What correction factor for - 4 deg C motor rating?
RE: What correction factor for - 4 deg C motor rating?
Keith Cress
Flamin Systems, Inc.- http://www.flaminsystems.com
RE: What correction factor for - 4 deg C motor rating?
RE: What correction factor for - 4 deg C motor rating?
Environmental Conditions
Machines shall be designed for the following operating site conditions, unless other conditions are specified by the purchaser.
a. Exposure to an ambient temperature in the range of –15°C to 40 °C or, when water cooling is used, an ambient range of 5°C ( to prevent freezing of water) to 40 °C, except for machines rated less than ¾ HP and all machines other than water cooled having commutator or sleeve bearings for which the minimum ambient temperature is 0°C.
RE: What correction factor for - 4 deg C motor rating?
Yes as indicated by "dpc" torque is a concern do you suggets me to double the torque for cold start of pump?
becuase i have to select the motor for pump operating temperature in winter condition is -4 to -40 deg C?
RE: What correction factor for - 4 deg C motor rating?
this sounds like a freezer job
-20 degree F conditions
in my industry it is always standard practice to mulitply any hp requirments by 1.25 on top of any hp calc for motors. This was due to things never worked at that low of temperature as they did above freezing.
Of course you have all the thin gear box oil that you need. Then of course avoiding the use of compressed air unless you could gaurentee the dewpoint down to -20f.
RE: What correction factor for - 4 deg C motor rating?
thanks very much for your reply. Finally i worked with factor 2 to be on more safer side.
RE: What correction factor for - 4 deg C motor rating?