Vonsch Quatrofrem Series, Конфигурация и диагностика

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UNIFREM v.3.41x
10 May 2017 Page 130 from 180
Parameter ID: 451
SETTINGS – > CONTROL AND REGULATION – > CONTROL METHOD – > Motor control method
V/f open - V/f control (scalar) without the speed feedback.
V/f closed - V/f control (scalar) with the speed feedback.
VIM closed - Dynamic vector motor control with the rotation feedback.
VIM open. - Dynamic vector motor control without the rotation.
V-SMPM - Dynamic vector motor control with the rotation feedback designed for synchronous
motors.
In the next section, we will focus mainly to functions designed for
V / F control.
8.3.1 V/f control
FREQUENCY RAMPS
Converter can use flexible ramp functions which ensure smooth transitions between different
frequency setpoint values to prevent sudden step changes of the output frequency during motor
control. Allowed ranges of changes of frequency (min., max.), ramp break - points
and also times
of the respective sections can be set by parameters of ramp functions. By using these parameters,
it is possible to adapt the dynamic comfort of the drive for a specific application.
Parameters to accommodate the acceleration and deceleration ramps are in the following group:
Parameter ID: 106
SETTINGS – > CONTROL AND REGULATION – > FREQUENCY RAMPS
S-CURVE
If there is a demand that the acceleration should not change too quickly, it is suitable to use a S-
curve that ensures smooth acceleration changes (Frequency profile is curved in the shape of S).
V [V]
0
F
MAX
PAR. ID = 111
Ramp-up break
PAR. ID = 117
Ramp-down break
PAR. ID = 121
F
SETPOINT
PAR. ID =
162
F
MIN
PAR. ID = 110
Linear frequency ramps
t [s]
F [Hz]
T
1 Ramp-up
PAR. ID = 116
T
1 Ramp-down
PAR. ID = 119
T
2 Ramp-down
PAR. ID = 120
T
2 Ramp-up
PAR. ID = 118