Vonsch Quatrofrem Series, Конфигурация и диагностика

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UNIFREM v.3.41x
10 May 2017 Page 71 from 180
Name [ID] Description Def.
□ S -curve
ramp-up -
Turning on / off the S-curve for ramp-up from 0 to negative frequency.
□ S -curve
ramp-down -
Turning on / off the S-curve for ramp-down from negative frequency to 0.
□ S splitting Splitting the S-curve to two separate S sections if the ramp passes 0Hz on ramp-up.
□ Higher
insensitivity
Setting the 5x higher insensitivity to changes of the frequency setpoint against the standard
insensitivity +/- 0.01 % from Fnom. Insensitivity secures the operation of S-curves even on
interfered frequency setpoint signals (for example AINx).
S-curve
curvature
[873]
Setting the curvature of the S-curve. It is the curvature degree of the
characteristics.
100,0 %
1,0 % ÷ 100,0
%
When curvature equals 100%, the linear section will not be present during the ramp operation.
When curvature equals 50%, there will be a linear section in the middle of the S-curve with
the duration of 50% of the total time. When curvature equals 0%, the whole ramp is linear.
ATTENTION! BY 100% curvature, the time needed to reach the frequency setpoint is double
the time that is needed for the linear frequency ramp.
7.5.5 MAXIMUM CURRENT AND VOLTAGE
Group of parameters number [1211]
Values of current and output voltage restrictions.
MENU \ SETTINGS \ CONTROL AND REGULATION \ MAXIMUM CURRENT AND VOLTAGE
Name [ID] Description Def.
Max. mot.
current [5]
Maximal current on the converter output in motoric mode of operation . 5,10 A
Magnetizing
current [355]
÷
(I
NK
x 1,75) 6
Upper limit of the motor current in the motoric mode of operation. This current is not
exceeded in vector control mode or in V/f control mode, when the maximum current
controller (MCC) in motoric mode is turned on. During fast load step changes can the
current on the converter output shortly exceed this limit, it depends on the load inertia, rate
of load and the MCC dynamics [351] (page 60).
6
The value depends on the inverter power line. See installation manual.
Max. regen.
current [549]
Maximal current on the converter output in regenerative mode of operation. 5,10 A
Magnetizing
current [355]
÷
(I
NK
x 1,75)
6
Upper limit of the motor current in the regenerative mode of operation. This current is not
exceeded in vector control mode or in V/f control mode, when the maximum current
controller (MCC) in regenerative mode is turned on. During fast load step changes can the
current on the converter output shortly exceed this limit, it depends on the load inertia, rate
of load and the MCC dynamics [351] (page 60).
6
The value depends on the inverter power line. See installation manual.
Max. voltage
[495]
Setting the voltage limit on the output of the frequency converter. 175,0 %
5,0 % ÷ 200,0 %
In scalar control, voltage is limited to this value. In vector control it is used as saturation of
the output of current controllers. Represents a percentage of the nominal voltage of the
motor Nom. voltage [59] (page 44). This means that if the DC link has sufficient voltage it
is possible to supply higher voltage to the motor . If the inverter is made for 400V and
motor for 230V, by setting this parameter to 174%, an increase in motor power and
operation with nominal torque up to 87Hz is achieved.
Max. duty cycle
[1289]
Maximum allowed duty cycle of the converter output power elements. 107,5 %
0,0 % ÷ 130,0 %
This parameter limits the overmodulation and thus higher harmonic components of
voltages and currents at the moment, when there is not not sufficient DC bus voltage. It
can be combined with a higher value of the parameter Max. voltage [495] (page 71).
7.5.6 FLYING START
Group of parameters number [373]
Parameters of the converter start mode when motor is rotating (flying start).
MENU \ SETTINGS \ CONTROL AND REGULATION \ FLYING START
Name [ID] Description Def.