ASFIFF12 High Speed
vacon • 37
24-hour s358 (0)40 837 1150 • Email: [email protected]
600
Motor control mode
(2.6.1)
NXS:
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%).
The following selections are available for Vacon NXP drives only, except for selection
2
which is available in the Multi-Purpose Control Application for NXS drives also.
2
Torque control
In torque control mode, the references are used to control
the motor torque.
3
Speed crtl (closed loop) The I/O terminal and keypad references are speed
references and the frequency converter controls the motor
speed very accurately comparing the actual speed received
from the tachometer to the speed reference (accuracy
±0.01%).
4
Torque crtl (closed loop) The I/O terminal and keypad references are torque
references and the frequency converter controls the motor
torque.
5
Frequency control (advanced open loop)
Frequency control with better performance at lower speeds.
6
Speed control (advanced open loop)
Speed control with better performance at lower speeds.
601 Switching
frequency
(2.6.9)
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]
0003—0061 NX_2
0003—0061 NX_5
1.0 16,0 10.0
0075—0205 NX_2
1.0
10.0
3.6
0072—0520 NX_5
1.0
6.0
3.6
0004—0208 NX_6
1.0
6.0
1.5
Table 5-6. Size-dependent switching frequencies
602
Field weakening point
(2.6.4)
The field weakening point is the output frequency at which the output voltage reaches the
set (
) maximum value.
