YASKAWA GPD315/V7-4X, Technical Manual

Page: 96 / 162

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