24 • vacon
description of parameters
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2.4 DRIVE
CONTROL
2.4.1 Brake
chopper
0 = No brake chopper used
1 = Brake chopper in use when running
2 = Brake chopper in use when running
3 = Used drive is ready
When the frequency converter is decelerating the motor, the inertia of the motor and
the load are fed into an external brake resistor. This enables the frequency converter
to decelerate the load with a torque equal to that of acceleration (provided that the
correct brake resistor has been selected). See separate Brake resistor installation
manual.
2.4.2 Stop
function
Coasting:
0
The motor coasts to a halt without any control from the frequency converter,
after the Stop command.
Ramp:
1
After the Stop command, the speed of the motor is decelerated according to
the set deceleration parameters.
If the regenerated energy is high it may be necessary to use an external
braking resistor for faster deceleration.
Frequency limit
2
Coasting Stop if the motor frequency is above the frequency limit (
when stop request is given. Stop by ramp if the motor frequency is the same
or below this parameter when stop request is given.
2.4.3 Frequency
limit
Defines the frequency limit for the stop function if selected as the frequency limit (par.
2.4.2=2).
If the motor frequency is above the frequency limit the motor costs to stop and if it is
below or the same as the frequency limit the stop function is ramp.
