V/F Pattern - YASKAWA V7 Technical Manual

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).
Max. Starting
Freq. Torque
50 Normal
2
50 High
60 Normal
2
60 High
50 Normal
50 Medium
2
50 High
60 Normal
60 Medium
2
60 High
72 Normal
90 Normal
120 Normal
180 Normal
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.
Table 5-4. Recommended V/f Patterns
Load n011 n012
1
Type (Hz) (V)
VT 50 230
VT 50 230
VT 60 230
VT 60 230
CT 50 230
CT 50 230
CT 50 230
CT 60 230
CT 60 230
CT 60 230
CT 72 230
CT 90 230
CT 120 230
CT 180 230
n013 n014
3
(Hz) (Hz)
50 25.0
50 25.0
60 30.0
60 30.0
50 3.0
50 2.5
50 2.5
60 3.0
60 3.0
60 3.0
60 3.0
60 3.0
60 3.0
60 3.0
5-40
n015 n016 n017
3
(V) (Hz) (V)
40.2 1.3 9.2
57.5 1.3 11.5
40.2 1.5 9.2
57.5 1.5 11.5
17.2 1.5 11.5
23.0 1.3 13.8
28.7 1.3 16.1
17.2 1.5 11.5
20.7 1.5 13.8
28.7 1.5 23.0
17.2 1.5 11.5
17.2 1.5 11.5
17.2 1.5 11.5
17.2 1.5 11.5
3