YASKAWA A1000 Series

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V/f Pattern Settings (E1-03)
The
drive uses a V/f pattern to adjust the output voltage relative to the frequency reference. There are 15 different predefined
V/f patterns (setting 0 to E) from which to select, each with varying voltage profiles, saturation levels (frequency at which
maximum voltage is reached), and maximum frequencies. Additionally, one custom V/f pattern is available (setting F) that
requires the user to create the pattern using parameters E1-04 through E1-10.
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E1-03: V/f Pattern Selection
Selects the V/f pattern for the drive and motor from 15 predefined patterns or creates a custom V/f pattern.
No. Parameter Name Setting Range Default
E1-03 V/f Pattern Selection
0 to F
<2>
F
<1>
<1> Parameter is not reset to the default value when the drive is initialized using A1-03.
<2>
Settings 0 through E are not available when A1-02 = 2, 3, 5, 6, or 7.
Setting a Predefined V/f Pattern (Setting 0 to E)
Choose the V/f pattern that best meets the application demands from Table 4.13. These settings are available only in
V/f Control modes. Set the correct value to E1-03. Parameters E1-04 to E1-13 can only be monitored, not changed.
Note: 1. Setting an improper V/f pattern may result in low motor torque or increased current due to overexcitation.
2. Drive initialization does not reset parameter E1-03.
Table 4.13 Predefined V/f Patterns
Setting Specification Characteristic Application
0 50 Hz
Constant torque
For general purpose applications. Torque remains
constant regardless of changes to speed.
1 60 Hz
2 60 Hz (with 50 Hz base)
3 72 Hz (with 60 Hz base)
4 50 Hz, Variable torque 1
Variable torque
For fans, pumps, and other applications where the
required torque changes as a function of the speed.
5 50 Hz, Variable torque 2
6 60 Hz, Variable torque 1
7 60 Hz, Variable torque 2
8 50 Hz, mid starting torque
High starting torque
Select high starting torque when:
•
Wiring between the drive and motor exceeds 150 m.
• A large amount of starting torque is required.
• An AC reactor is installed.
9 50 Hz, high starting torque
A 60 Hz, mid starting torque
B 60 Hz, high starting torque
C 90 Hz (with 60 Hz base)
Constant output
Output voltage is constant when operating at greater than
60 Hz.
D 120 Hz (with 60 Hz base)
E 180 Hz (with 60 Hz base)
F
<1>
60 Hz Constant torque
For general purpose applications. Torque remains
constant regardless of changes to speed.
<1> Setting
F enables a custom V/f pattern by changing parameters E1-04 to E1-13. When the drive is shipped, the default values for parameters E1-04
to E1-13 are the same as those of setting 1.
Predefined V/f Patterns for Models 2A0004 to 2A0021 (HD), 2A0004 to 2A0018 (ND), 4A0002 to 4A0011 (HD),
4A0002 to 4A0009 (ND), 5A0003 to 5A0009 (HD), and 5A0003 to 5A0006 (ND)
The following tables show details on predefined V/f patterns.
The voltage values in the following graphs are specific to 200 V class drives. Double the values for 400 V class drives. Multiply
the values by 2.875 for 600 V drives.
Table 4.14 Constant Torque Characteristics, Settings 0 to 3, F
Setting = 0 50 Hz Setting = 1, F 60 Hz Setting = 2 60 Hz Setting = 3 72 Hz
0
9
200
1.3 2.5 50
15
Voltage (V)
Frequency (Hz)
0
9
15
200
1.5 3 60
Voltage (V)
Frequency (Hz)
0
9
15
200
1.5 3 6050
Voltage (V)
Frequency (Hz)
0
9
15
200
1.5 3 7260
Voltage (V)
Frequency (Hz)
4.6 Basic Drive Setup Adjustments
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YASKAWA ELECTRIC TOEP C710616 41G YASKAWA AC Drive - A1000 Quick Start Guide