ECO REFERENCE MANUAL
8-10
SC
OTHER LOADS
Many other loads have non linear or varying
torque relationships. The torque requirement of
the load should be understood before the inverter
and motor is selected.
By comparing the load/speed requirement with
the motor capability, the correct motor can be
selected. Remember a different pole pair
arrangement (nameplate rated speed) may give a
better match to the load needs.
Starting torque may need special consideration. If
a high starting torque is required this must be
considered during rating.
This type of starting duty is generally not
characteristic of fan and pump applications.
Torque
150%
100%
Speed (X 50/60)
Continuous operation possible
Load characteristics
Short term (e.g. starting) operation possible
0
0.5
1.0
1.2
1.5