I thought the same as Andy mate - Why / how is he wrong? (NOT disputing, trying to understand
)`PACHE!!!
Sidewinder is picking on you! "unfortunately, the vet has got it right"? As in, he WANTED you to get it wrong!!!
"`sic im"
ROTFWL
3 Phase Extension Cable
- Thread starter sull
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Help Support Talk Electrician Forum:
)Sidewinder is picking on you! "unfortunately, the vet has got it right"? As in, he WANTED you to get it wrong!!!
"`sic im"
ROTFWL
OK I'll do my best for now late and lots of you know what!
The only differences apart from the mechanical envelope due to generally "standards" is the windings.
The synchronous speeds are not that much different.
Think about it 3000/3600 = 83.3r%.
Thus the speed is reduced by 16.6r%.
However.
The synchrounous speed of a 50Hz motor is 3k rpm.
The operating speed is design dependent and may be as low as 2800 rpm.
2800/3000 = 93.3r%
How many squirrel cage motors do you know of that run at 100% duty cycle?
NONE!
Unless the designer has mucked up.
The FLC is just that FLC.
THe motor will never draw FLC in operation unless there is a fault on the system or the system is incorrectly designed.
Think about the insulation classes of the motors & the duty cycles.
S1 Continuous duty The motor works at a constant load for enough time to reach temperature equilibrium.
S2 Short-time duty The motor works at a constant load, but not long enough to reach temperature equilibrium. The rest periods are long enough for the motor to reach ambient temperature.
S3 Intermittent periodic duty Sequential, identical run and rest cycles with constant load. Temperature equilibrium is never reached. Starting current has little effect on temperature rise.
S4 Intermittent periodic duty with starting Sequential, identical start, run and rest cycles with constant load. Temperature equilibrium is not reached, but starting current affects temperature rise.
S5 Intermittent periodic duty with electric braking Sequential, identical cycles of starting, running at constant load and running with no load. No rest periods.
S6 Continuous operation with intermittent load Sequential, identical cycles of running with constant load and running with no load. No rest periods.
S7 Continuous operation with electric braking Sequential identical cycles of starting, running at constant load and electric braking. No rest periods.
S8 Continuous operation with periodic changes in load and speed Sequential, identical duty cycles run at constant load and given speed, then run at other constant loads and speeds. No rest periods.
Think about these cycles in real life?
Got to go, dead on my feet. Loads on.
TTFN all
p.s no spell check so tough
The only differences apart from the mechanical envelope due to generally "standards" is the windings.
The synchronous speeds are not that much different.
Think about it 3000/3600 = 83.3r%.
Thus the speed is reduced by 16.6r%.
However.
The synchrounous speed of a 50Hz motor is 3k rpm.
The operating speed is design dependent and may be as low as 2800 rpm.
2800/3000 = 93.3r%
How many squirrel cage motors do you know of that run at 100% duty cycle?
NONE!
Unless the designer has mucked up.
The FLC is just that FLC.
THe motor will never draw FLC in operation unless there is a fault on the system or the system is incorrectly designed.
Think about the insulation classes of the motors & the duty cycles.
S1 Continuous duty The motor works at a constant load for enough time to reach temperature equilibrium.
S2 Short-time duty The motor works at a constant load, but not long enough to reach temperature equilibrium. The rest periods are long enough for the motor to reach ambient temperature.
S3 Intermittent periodic duty Sequential, identical run and rest cycles with constant load. Temperature equilibrium is never reached. Starting current has little effect on temperature rise.
S4 Intermittent periodic duty with starting Sequential, identical start, run and rest cycles with constant load. Temperature equilibrium is not reached, but starting current affects temperature rise.
S5 Intermittent periodic duty with electric braking Sequential, identical cycles of starting, running at constant load and running with no load. No rest periods.
S6 Continuous operation with intermittent load Sequential, identical cycles of running with constant load and running with no load. No rest periods.
S7 Continuous operation with electric braking Sequential identical cycles of starting, running at constant load and electric braking. No rest periods.
S8 Continuous operation with periodic changes in load and speed Sequential, identical duty cycles run at constant load and given speed, then run at other constant loads and speeds. No rest periods.
Think about these cycles in real life?
Got to go, dead on my feet. Loads on.
TTFN all
p.s no spell check so tough
I now have confirmation from the supplier regarding the specifications of the motor, they had supplied me with the U.S.A Specs which generated a great deal of debate on this thread. The EU specs are:
1: Electric 400 V (360 to 440V) with 16 Amps minimum , better 32 Amps, and with 50 Hz for the EU Version
So please just to confirm I can supply this motor using a 100m extension of SY cable - any other information will be gratefully received.
This is for outdoor use.
Many thanks once again for your help.
Scott
1: Electric 400 V (360 to 440V) with 16 Amps minimum , better 32 Amps, and with 50 Hz for the EU Version
So please just to confirm I can supply this motor using a 100m extension of SY cable - any other information will be gratefully received.
This is for outdoor use.
Many thanks once again for your help.
Scott
Scott,
We still need to know the FLC of the motor, & where the starter will be.
There is a reason for that q.
Got to dash, just got in from work & have reports & inv to do.
TTFN
We still need to know the FLC of the motor, & where the starter will be.
There is a reason for that q.
Got to dash, just got in from work & have reports & inv to do.
TTFN
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