22 • vacon
Description of parameters
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4.
DESCRIPTION OF PARAMETERS
On the following pages you will find the parameter descriptions arranged according to the individual ID
number of the parameter. A shaded parameter ID number (e.g.
418 Motor potentiometer UP
) indicates
that the
TTF programming method
shall be applied to this parameter (see chapter 6.4. in the Application
Manual).
Some parameter names are followed by a number code indicating the "All in One" applications in which the
parameter is included. If no code is shown the parameter is available in all applications. See below. The
parameter numbers under which the parameter appears in different applications are also given.
101
Minimum
frequency
(2.1.1)
102
Maximum
frequency
(2.1.2)
Defines the frequency limits of the frequency converter.
The maximum value for these parameters is 320 Hz.
The software will automatically check the values of parameters ID105, ID106 and ID728.
103
Acceleration
time
1
(2.1.3)
104
Deceleration
time
1
(2.1.4)
These limits correspond to the time required for the output frequency to accelerate from the
zero frequency to the set maximum frequency (par. ID102).
105
Preset speed 1
(2.1.15)
Parameter values are automatically limited between the minimum and maximum frequencies
(par. ID101, ID102).
107
Current
limit
(2.1.5
)
This parameter determines the maximum motor current from the frequency converter. The
parameter value range differs from size to size. When this parameter is changed the stall
current limit (ID710) is internally calculated to 90% of current limit.
108
U/f
ratio
selection
(2.6.2)
Linear:
0
The voltage of the motor changes linearly with the frequency in the constant
flux area from 0 Hz to the field weakening point where the nominal voltage is
supplied to the motor. Linear U/f ration should be used in constant torque
applications. This default setting should be used if there is no special
need for another setting.
Squared:
1
The voltage of the motor changes following a squared curve form with the
frequency in the area from 0 Hz to the field weakening point where the nomi-
nal voltage is also supplied to the motor. The motor runs undermagnetised
below the field weakening point and produces less torque and electro-
mechanical noise. Squared U/f ratio can be used in applications where torque
demand of the load is proportional to the square of the speed, e.g. in
centrifugal fans and pumps.
