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Setting V/f Pattern (E1-02)
The V/f pattern can be selected using parameter E1-03. There are two methods of setting the V/f pattern:
Select one of the 15 preset pattern types (set value: 0 to E), or set a user-defined V/f pattern (set value: F).
The factory setting for E1-03 is F.
To select one of the existing patterns, refer to the following table.
When you select these patterns, the values of parameters E1-04 to E1-10 are changed automatically. There are
three types of values for E1-04 to E1-10, depending on the Inverter capacity.
• 0.4 to 1.5 kW V/f pattern
• 2.2 to 45 kW V/f pattern
• 55 to 300 kW V/f pattern
The characteristics diagrams for each are shown in the following pages.
Characteristic Application Set Value Specifications
Constant Torque Char-
acteristic
These patterns are used in general applications where
the load torque is fixed, regardless of rotation speed,
e.g. for linear transport systems.
0 (F) 50 Hz specifications
1 60 Hz specifications
2 60 Hz specifications, voltage saturation at 50 Hz
3 72 Hz specifications, voltage saturation at 60 Hz
Variable torque charac-
teristic
These patterns are used for loads with torque propor-
tional to the square or cube of the rotation speed, such as
fans and pumps.
4
50 Hz specifications,
cubical torque characteristic
5 50 Hz specifications, quadratic torque characteristic
6 60 Hz specifications, cubical torque characteristic
7 60 Hz specifications, quadratic torque characteristic
High Startup Torque
* 1
* 1. The high start-up torque is provided by the automatic torque boost functionality (Torque compensation), so normally there is notneed to used
these patterns.
Select a high startup torque V/f pattern only in the fol-
lowing cases.
• The wiring distance between Inverter and motor is
large (Pyrex. 150 m min.)
• A large torque is required at startup
• An AC reactor is inserted in the Inverter input or out-
put.
8 50 Hz specifications, medium startup torque
9 50 Hz specifications, large startup torque
A 60 Hz specifications, medium startup torque
B 60 Hz specifications, large startup torque
Fixed Output Opera-
tion
This pattern is used for frequencies of 60 Hz or higher.
A fixed voltage is applied.
C 90 Hz specifications, voltage saturation at 60 Hz
D 120 Hz specifications, voltage saturation at 60 Hz
E 180 Hz specifications, voltage saturation at 60 Hz
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