27 v/f pattern, V/f pattern -38 – Yaskawa V7 Drives User Manual
Page 92
5-40
5.27 V/f PATTERN
The V/f pattern can be tailored to suit your specific application and load characteristics by adjusting
parameters
n011 to n017 (see the V/f characteristics figure on the following page).
NOTES:
1
VT = Variable Torque, typically used for blowers, centrifugal pumps, and fans.
CT = Constant Torque, most other applications. Consult the manufacturer for further assistance.
The following conditions must be considered when selecting a V/f pattern:
- Pattern matches the voltage-frequency characteristics of the motor.
- Maximum motor speed.
2
V/f pattern for high starting torque should be selected for:
- Long wiring distance.
- Large voltage drop at start
- AC reactor connected to Drive input or output.
- Use of motor rated below Drive max. output.
3
Voltages shown are for 230V motors; for other motor voltages, multiply all voltage (V) values by (Vmtr/230).
i.e., for a 460V motor, multiply by 460/230 = 2.
Max.
Starting
Load
n011
n012
n013
n014
n015
n016
n017
Freq.
Torque
Type
1
(Hz)
(V)
3
(Hz)
(Hz)
(V)
3
(Hz)
(V)
3
50
Normal
VT
50
230
50
25.0
40.2
1.3
9.2
50
High
2
VT
50
230
50
25.0
57.5
1.3
11.5
60
Normal
VT
60
230
60
30.0
40.2
1.5
9.2
60
High
2
VT
60
230
60
30.0
57.5
1.5
11.5
50
Normal
CT
50
230
50
3.0
17.2
1.5
11.5
50
Medium
CT
50
230
50
2.5
23.0
1.3
13.8
50
High
2
CT
50
230
50
2.5
28.7
1.3
16.1
60
Normal
CT
60
230
60
3.0
17.2
1.5
11.5
60
Medium
CT
60
230
60
3.0
20.7
1.5
13.8
60
High
2
CT
60
230
60
3.0
28.7
1.5
23.0
72
Normal
CT
72
230
60
3.0
17.2
1.5
11.5
90
Normal
CT
90
230
60
3.0
17.2
1.5
11.5
120
Normal
CT
120
230
60
3.0
17.2
1.5
11.5
180
Normal
CT
180
230
60
3.0
17.2
1.5
11.5
Table 5-4. Recommended V/f Patterns