46
The ohmic resistance measurement method requires the compressor to be stabilized at the ambient
temperature and the availability of instruments for measuring the ohmic resistance (digital Ohmmeter,
Whetstone’s bridge) and the temperature.
a) Measure the ohmic resistance Rf of the main winding (run) between
the pins of the hermetic terminal C “common” and R “run”. Measure
the corresponding stabilized reference temperature Tf.
b) Measure the ohmic resistance Rc of the main winding (run) between
the pins C and R with hot motor, at the working conditions to which
you intend to measure the motor temperature.
c) Calculate the above hot motor temperature Tc with the following
formula:
Calculation formula for Cu winding:
Where:
Table 10.13a Electrical data of three phase motor (380V 50Hz), R449A
Tc = Unknown temperature with hot motor
Tf = Motor temperature measured at the stabilized reference temperature
Rc = Measured ohmic resistance, corresponding to the Tc temperature
Rf = Measured ohmic resistance, corresponding to the Tf temperature
APPLICATION MODEL
Rated load
amps
RLA (A)
Locked
rotor am ps
LRA (A)
Max
operating
current
MOC (A)
Run Winding
Resistance
(±10%) at 25°C
(Ω)
MBP
SE6015GS-O 3,1 22 5,2 6,7
SE6018GS-O 4,4 45 6,4 3,3
SE6021GS-O 4,6 45 6,9 3,3
SE6026GS-O 6 60 9,2 3,3
SE6030GS-O 6,4 60 10,3 2,45
SE6036GS-O 7,1 60 12,2 2,45
SE6043GS-O 8,2 65 14,3 1,9
SE6053GS-O 10,9 117 17, 3 1,09
SE6056GS-O 11,2 117 18,4 1,09
SE6067GS-O 12,6 117 21 1,09
SE6078GS-O 13,7 121 23,6 1,06
SE6085GS-O 14,5 121 26,5 1,06
SE6089GS-O 15,1 121 2 7, 6 1,06
LBP
SE2006GS-O 2,2 22 3,8 6,7
SE2008GS-O 2,6 22 4,4 6,7
SE2010GS-O 4 45 5,8 3,3
SE2012GS-O 5,2 60 7, 5 2,45
SE2014GS-O 5,6 60 8,8 2,45
SE2017GS-O 5,9 60 10,3 2,45
SE2020GS-O 6,6 60 12,1 1,9
SE2023GS-O 9 117 18 1,09
SE2028GS-O 9,6 117 20,1 1,09
SE2031GS-O 10,3 121 22,7 1,09
SE2039GS-O 11,1 121 25,6 1,06
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