Vacon Plc
Phone: +358-201 2121
Fax:+358-201 212 205
Service: +358-40-8371 150
E-mail: [email protected]
Page 8
Vacon
Pump and fan control with autochange
Un
(Par 6
.
4)
(Par. 6
.
3)
U[V]
f[Hz]
UD009K07
Figure 6.4-1 Linear and squared U/f curves.
Programm. The U/f curve can be programmed with three different points.
U/f curve
The parameters for programming are explained in the chapter 5.2.
2
The programmable U/f curve can be used if the other settings do not
satisfy the needs of the application. See figure 4-2.
Un
Par 6
.
4
Par. 6
.
3
U[V]
f[Hz]
UD009K08
Par. 6
.
5
(Olet. 5 Hz)
Par. 6
.
6
(Olet. 10%)
Par. 6
.
7
(Olet. 1.3%)
Figure 6.4-2 Programmable U/f curve.
1. 9
U/f optimization
Automatic
The voltage to the motor changes automatically which makes the
torque
motor to produce torque enough to start and run at low frequencies.
boost
The voltage increase depends on the motor type and power.
Automatic torque boost can be used in applications where starting
torque is high due to starting friction, e.g. in conveyors.
NOTE!
In high torque - low speed applications - it is likely the motor will
overheat. If the motor has to run a prolonged time under these
conditions, special attention must be paid to cooling the motor. Use
external cooling for the motor if the temperature tends to rise too high.
Default: nominal frequency
of the motor
Field weakening
point
Default: nominal
voltage of the
motor
Linear
Squared
Default: nominal frequency
of the motor
Default: nominal
voltage of the
motor
Field weakening
point
!
