SF01U 43
HP DEFAULT HP DEFAULT
"Normal"
Linear V/Hz
Ratio
V/Hz Ratio
Affected By
Fixed Boost
1/2 Base
Frequency
Base
Frequency
Full
Output
Volts
0.25 - 1 5.3% 10 2.4%
1.5 - 2 4.4% 15 2.2%
3 3.6% 20 2.0%
5 3.0% 25 1.8%
7.5 2.7% 30 1.6%
P29 ACCELERATION BOOST
ACCELERATION BOOST helps accelerate high-inertia loads. During acceleration, the output
voltage is increased to increase motor torque. Once the motor reaches the new speed setpoint,
the boost is turned off and the output voltage returns to the normal value.
P30 SLIP COMPENSATION
SLIP COMPENSATION is used to counteract changes in motor speed (slip) caused by changes
in load. In a standard AC induction motor, the shaft speed decreases as load increases, and
increases as load decreases. By increasing or decreasing the output frequency in response
to an increasing or decreasing load, the slip is counteracted and speed is maintained. Most
standard NEMA B motors have a 3% slip rating.
P31-P37 PRESET SPEED #1 - #7
Preset speeds are activated by contact closures between TB-2 and TB-13A, 13B, and 13C. The
TB-13 terminals must be programmed as preset speed selects using Parameters 10-12.
NOTE
• Preset speeds can operate below the frequency defined by the minimum
frequency parameter (Parameter 23). The range of adjustment for the
preset speeds is from 0 Hz to the maximum frequency (Parameter 24).
• When a TB-13 terminal is programmed for a function other than a preset
speed select, it is considered OPEN for the table above.
Refer to the table below for activation of the preset speeds using the TB-13 terminals.
SPEED # TB - 13A TB - 13B TB - 13C
1 CLOSED OPEN OPEN
2 OPEN CLOSED OPEN
3 OPEN OPEN CLOSED
4 CLOSED CLOSED OPEN
5 CLOSED OPEN CLOSED
6 OPEN CLOSED CLOSED
7 CLOSED CLOSED CLOSED
Preset Speed #6 and #7 can also be used as skip frequencies to restrict the drive from operating
at frequencies that cause vibration in the system as described in Parameter 38.
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