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This is used to correctly flux the motor at low speeds. This allows the drive to
produce greater starting torque for high friction loads. The VOLTAGE BOOST
parameter increases the motor volts above the selected V/F characteristic at the lower
end of the speed range.
OUTPUT VOLTS
CONSTANT
POWER RANGE
100%
INCREASED
TORQUE
FLUXING
NORMAL FLUXING
25%
INCREASING
BOOST
0%
FREQUENCY
f
B
f
B
= BASE FREQUENCY
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A choice of three stopping modes are available:
The motor speed is reduced down to zero at a rate set by the RAMP
DOWN TIMEparameter (P4). A 2 second pulse is applied at end
of ramp.
RAMP
The motor is allowed to freewheel to a standstill.
COAST
On a stop command the motor volts are rapidly reduced at constant
frequency to deflux the motor. A low frequency braking current is
then applied until the motor speed is almost zero. This is followed
by a timed DC pulse to hold the motor shaft. Braking current
during the injection stopping sequence is controlled by the
CURRENT LIMITparameter (P5).
INJECTION
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