Description of parameters
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600
Motor
control
mode
(2.6.1)
0 Frequency control:
The I/O terminal and keypad references are frequency references
and the frequency converter controls the output frequency (output
frequency resolution = 0.01 Hz)
1 Speed control:
The I/O terminal and keypad references are speed references and
the frequency converter controls the motor speed compensating
the motor slip (accuracy ± 0,5%).
601
Switching
frequency
(2.6.8)
Motor noise can be minimised using a high switching frequency. Increasing the switching
frequency reduces the capacity of the frequency converter unit.
The range of this parameter depends on the size of the frequency converter:
Type
Min. [kHz]
Max. [kHz]
Default [kHz]
0016—0061 NX_5
1.0
10,0
10.0
0072—2300 NX_5
1.0
10.0
3.6
0170—1500 NX_6
1.0
6.0
1.5
Table 31. Size-dependent switching frequencies
Note! The actual switching frequency might be reduced down to 1,5kHz by thermal
management functions. This has to be considered when using sine wave filters or
other output filters with a low resonance frequency.
602
Field
weakening
point
(2.6.3)
The field weakening point is the output frequency at which the output voltage reaches the set
(
) maximum value.
603
Voltage at field weakening point
(2.6.4)
Above the frequency at the field weakening point, the output voltage remains at the set maxi-
mum value. Below the frequency at the field weakening point, the output voltage depends on
the setting of the U/f curve parameters. See parameters
When the parameters
(nominal voltage and nominal frequency of the motor)
are set, the parameters ID602 and ID603 are automatically given the corresponding values. If
you need different values for the field weakening point and the maximum output voltage,
change these parameters after setting the parameters
604
U/f curve, middle point frequency
(2.6.5)
If the programmable U/f curve has been selected with parameter
this parameter defines
the middle point frequency of the curve. See Figure 2.
605
U/f curve, middle point voltage
(2.6.6)
If the programmable U/f curve has been selected with the parameter
this parameter
defines the middle point voltage of the curve. See Figure 2.
606
Output voltage at zero frequency
(2.6.7)
If the programmable U/f curve has been selected with the parameter
this parameter
defines the zero frequency voltage of the curve. NOTE: If the value of parameter
changed this parameter is set to zero. See Figure 2.
