YASKAWA Varispeed E7 Instruction Manual And Parameter Description page 233

Characteristic
Constant Torque
Characteristic
Variable torque
characteristic
High Startup
*
Torque
Fixed Output
Operation
* 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 constants 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.
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Application
These patterns are used in general applica-
tions where the load torque is fixed, regard-
less of rotation speed, e.g. for linear
transport systems.
These patterns are used for loads with
torque proportional 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 following cases.
• The wiring distance between Inverter and
motor is large (approx. 150 m min.)
• A large torque is required at startup
• An AC reactor is inserted in the Inverter
input or output.
This pattern is used for frequencies of
60 Hz or higher. A fixed voltage is applied.
Set
Specifications
Value
0 (F) 50 Hz specifications
1 60 Hz specifications
60 Hz specifications, voltage saturation at
2
50 Hz
72 Hz specifications, voltage saturation at
3
60 Hz
50 Hz specifications, cubical torque charac-
4
teristic
50 Hz specifications, quadratic torque char-
5
acteristic
60 Hz specifications, cubical torque charac-
6
teristic
60 Hz specifications, quadratic torque char-
7
acteristic
50 Hz specifications, medium startup
8
torque
9 50 Hz specifications, large startup torque
60 Hz specifications, medium startup
A
torque
B 60 Hz specifications, large startup torque
90 Hz specifications, voltage saturation at
C
60 Hz
120 Hz specifications, voltage saturation at
D
60 Hz
180 Hz specifications, voltage saturation at
E
60 Hz