Omron VARISPEED E7 User Manual page 236

Characteristic
These patterns are used in general applications
Constant Torque
where the load torque is fixed, regardless of rota-
Characteristic
tion speed, e.g. for linear transport systems.
These patterns are used for loads with torque
Variable torque
proportional to the square or cube of the rotation
characteristic
speed, such as fans and pumps.
Select a high startup torque V/f pattern only in
the following cases.
• The wiring distance between Inverter and
High Startup
motor is large (approx. 150 m min.)
*
Torque
• A large torque is required at startup
• An AC reactor is inserted in the Inverter
input or output.
Fixed Output Oper- This pattern is used for frequencies of 60 Hz or
ation higher. A fixed voltage is applied.
* The high start up torque is provided by the fully automatic torque boost function, so normally there is no need to use this pattern.
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.
Application
Set
Specifications
Value
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
50 Hz specifications, cubical torque characteris-
4
tic
50 Hz specifications, quadratic torque character-
5
istic
60 Hz specifications, cubical torque characteris-
6
tic
60 Hz specifications, quadratic torque character-
7
istic
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
120 Hz specifications, voltage saturation at 60
D
Hz
180 Hz specifications, voltage saturation at 60
E
Hz
6
97
6-