Mike Dolt Enterprises
Mike Dolt Enterprises
User: hockeyoligist2, Location: close to greenville sc
Asked on: Tuesday, April 26, 2011 at 2:54 pm EDT
Answered on: Tuesday, May 14, 2024 at 4:39 am EDT
Question: Something new to me, I have a new motor to install, 20 HP, 460 V. On the nameplate it has FLA 35 amps, next line down it has PF amps 40. Never saw this before. Do I size the heaters on FLA or PF amps? No paperwork with the new motor. The old motor I'm replacing has FLA of 35 and pulls 24 amps. We are replacing old motors with high efficiency motors to get a break from POCO.
The FLA (Full Load Amps) rating of a motor indicates the amount of current it will draw at full load under normal operating conditions. PF (Power Factor) amps is a measure of the percentage of current that is actually doing work, as opposed to being lost in the motor windings.When sizing heaters for a motor, you should always use the FLA rating. This is because the PF amps rating can vary depending on the load conditions, and you want to ensure that the heaters will provide enough protection even under the most demanding conditions.In your case, you have a new 20 HP, 460 V motor with an FLA of 35 amps and a PF amps rating of 40. This means that the motor will draw 35 amps at full load under normal operating conditions, and up to 40 amps under heavy load conditions. Therefore, you should size the heaters for 35 amps.It's worth noting that the old motor you are replacing had an FLA of 35 amps but was only drawing 24 amps. This is likely because the old motor was not operating at full load. However, when sizing heaters for a new motor, it's always best to use the FLA rating to ensure that the heaters will provide adequate protection. Flag for review