Calculating motor amperes – Rockwell Automation 150 MNL/SMC DIALOG+/APP-PROD GUIDE User Manual
Page 180
10-18
Reference
Electrical Formulas
(cont.)
Where:
kVA = Kilovolt-Amperes
I = Current (Amperes)
E = EMF or Voltage (Volts)
Where:
kW = Kilowatts
I = Current (Amperes)
E = EMF or Voltage (Volts)
PF = Power Factor
W = Watts
V = Volts
kVA = Kilovolt-Amperes
Calculating Motor Amperes
Where:
HP = Horsepower
E = EMF or Voltage (Volts)
Eff = Efficiency of Motor (%/100)
kVA = Kilovolt-Amperes
kW = Kilowatts
PF = Power Factor
kVA (1-phase)
I
E
×
1,00
-----------
=
kVA (3-phase
I
E
Ч
1.73
Ч
1,00
-------------------------
=
kW (1-phase)
I
E
×
PF
×
1,00
---------------------
=
kW (2-phase)
I
E
×
PF
1.42
Ч
Ч
1,00
------------------------------------
=
kW (3-phase)
I
E
×
PF
1.73
Ч
Ч
1,00
------------------------------------
=
PF
W
V
I
×
---------
kW
kVA
-------
=
=
Motor Amperes
HP
74
×
E
1.73
×
Eff
×
PF
×
-------------------------------------------
=
Motor Amperes
kVA
1,00
×
1.73
E
×
-------------------------
=
Motor Amperes
kW
1,00
×
1.73
E
×
PF
Ч
-----------------------------
=