Yaskawa Varispeed 626M5 - Manual (Page 282)

Appendix
15.2.4 Converting Metric Units and SI Units
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15.2.4 Converting Metric Units and SI Units
This manual uses SI units. SI units differ from the metric units for gravity used to date, so conversion is
necessary. Table 15.2 shows how to convert the main units of gravity and force to SI units.
Table 15.2 Metric Units and SI Units Conversion Table
Quantity Metric Unit SI Unit Conversion
Force and Load kgf N 1 kgf = 9.80665 N
Weight kgf --- The metric unit for weight and the SI unit
for mass are the same. (Mass expressed us-
ing SI units for bodies in the metric mea-
t f i ht Wk f d
Mass kgf
S
s 2 /m kg
g
surement for weight Wkgf are expressed as
Wkg.
Torque kgf
S
m N
S
m 1 kgf
S
m = 9.80665 N
S
m
Inertial Moment gf
S
cm
S
s 2 kg
S
m 2 1 gf
S
cm
S
s 2 = 9.80665 x 10 −5 kg
S
m 2
Speed (Revolu-
tions)
rpm min −1 1 rpm = 1 min −1
Vibration G m/s 2 1 G = 9.80665 m/s 2
Note: The relationship between the metric GD 2 and the SI unit for inertial moment is as follows:
GD 2 = 4J.
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