Group 11: Fan And Pump Control Parameters; V/F Curve Selection; Circulative Control; V/F Curve Diagram - Delta Electronics AC Drive VFD-F Series User Manual

5.12 Group 11: Fan and Pump Control Parameters

11 - 00

V/f Curve Selection

Settings
This parameter is to set V/f curve. If this parameter isn't set to 00, parameter 01-03 and
01-04 will disable.
Input current of the motor could divide into two orthogonal vectors: magnetic vector and
torque vector. Gap flux, which is produced by Magnetic vector, is in direct proportion with
output voltage of motor. Torque vector produces torque. Torque is in direct proportion with
the result of magnetic vector multiply by torque vector. In theory, if the value of magnet
vector is the same with torque vector (in unsaturated flux condition), the input current is
minimum. If motor loading is unsteady torque loading (loading torque is in direct proportion
with speed. For example, the loading of fan or pump), loading torque is low during low
speed, suitable lower input voltage will decrease input current of magnetic field to lower flux
loss and iron loss of the motor and promote whole efficiency.
When this parameter is set to high power V/f curve and low frequency torque is lower, it is
not suitable for AC drive to accel/decel quickly. If it needs to accel/decel quickly, it is not
recommended to use this parameter.
11 - 01

Circulative Control

Settings
This parameter is to set an AC drive runs with multiple motors in circulation control mode.
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00: Determined by group 1
01: 1.5 power curve
02: 1.7 power curve
03: 2 power curve
04: cube curve
01-02 Voltage%
100
90
80
1.7 power curve
70
2 power curve
60
50
3 power curve
40
30
20
10
0 20 40

V/F Curve Diagram

00: No function
01: Time circulation (by time)
02: Fixed amount circulation (by PID)
03: Fixed amount control (an AC drive runs with 4 motors)
1.5 power curve
Frequency
%
01-01
60 100
80
5-63
VFD-F Series
Factory Setting: 00
Factory Setting: 00
5