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Operation
3-19
51-V/HZ Profile - Sets the output V/Hz ratio for all values of
output voltage verses output frequency up to the Control Base
Frequency point. This adjustment will define how much voltage
is applied to the motor in various segments of the output
frequency range. Please note that motor voltage is related to
motor current which can then be related to motor torque. By
adjusting the V/Hz profile you can effectively adjust how much
torque is available from the motor at various speed points. The
available selections include LINEAR (0 or 1) to be used for
constant torque applications such as conveyors, and 50%
Square Law (2 or 3), or 100% Square Law (4 or 5) to be used for
variable torque applications such as centrifugal pumps and
blowers. Even number parameter values will select Auto-Boost
with the maximum amount of Torque Boost set by Parameter
52-Torque Boost. Odd number parameter values will select a
fixed amount of Torque Boost set by Parameter 52-Torque Boost.
The choices are shown graphically in Figure 3-1.
Figure 3-1 Volts/Hertz Profiles
Linear
100%
Square
Law
50% Square
Law
100% V
Boost
F Base
51-V/Hz
Profile = 0
F Base
51-V/Hz
Profile = 2
F Base
51-V/Hz
Profile = 4
F Base
51-V/Hz
Profile = 1
F Base
51-V/Hz
Profile = 3
F Base
51-V/Hz
Profile = 5
Fixed BoostAuto Boost
0%
100% V
Boost
0%
100% V
Boost
0%
100% V
Boost
0%
100% V
Boost
0%
100% V
Boost
0%