Eurotherm 601, Руководство по эксплуатации продукта, Страница: 23 / 30

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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
FREQUENCY
f B
25%
100%
BOOST
f B
= BASE FREQUENCY
0%
INCREASING
INCREASED
TORQUE
CONSTANT
POWER RANGE
FLUXING
NORMAL FLUXING
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A choice of three stopping modes are available:
RAMP
The motor speed is reduced down to zero at a rate set by the
RAMP
DOWN TIME
parameter (P4). A 2 second pulse is applied at end
of ramp.
COAST The motor is allowed to freewheel to a standstill.
INJECTION
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 LIMIT
parameter (P5).