SM01P 40
P28 FIXED BOOST
FIXED BOOST increases starting torque by increasing the output voltage when operating below
half of the base frequency. For better out-of-the-box performance, SCL/SCM Series drives
are shipped with a setting that is different from the factory default of 1%. Units rated 0.33 to 1
HP (0.25 to 0.75 kW) = 5.3%, 1.5 to 2 HP (1.1 to 1.5 kW) = 4.4%, 3 HP (2.2 kW) = 3.6%, 5 HP
(4 kW) = 3.0%, 7.5 HP (5.5 kW) = 2.7%, 10 HP (7.5 kW) = 2.4%, and 15 HP (11 kW) =
2.2%.
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-11 and TB-13A, 13B, and
13E. 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).
Refer to the table below for activation of the preset speeds using the TB-13 terminals:
SPEED # TB - 13A TB - 13B TB - 13E
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
NOTE
When a TB-13 terminal is programmed for a function other than a preset speed
select, it is considered OPEN for the table above.
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