Omron VARISPEED F7 User Manual page 297

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.
Characteristic
Constant Torque Char-
acteristic
Variable torque charac-
teristic
High Startup Torque
Fixed Output Opera-
tion
6
* 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.
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.
114
6-
Application
These patterns are used in general applications where
the load torque is fixed, regardless of rotation speed,
e.g. for linear transport systems.
These patterns are used for loads with torque propor-
tional to the square or cube of the rotation speed, such as
fans and pumps.
Select a high startup torque V/f pattern only in the fol-
lowing cases.
• The wiring distance between Inverter and motor is
* 1
large (Pyrex. 150 m min.)
• A large torque is required at startup
• An AC reactor is inserted in the Inverter input or out-
put.
This pattern is used for frequencies of 60 Hz or higher.
A fixed voltage is applied.
Set Value Specifications
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
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
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
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