Yaskawa Matrix Converter - Manual (Page 270)

Individual Functions
6-
105
„ Setting V/f Pattern
When using V/f Control, set the V/f pattern in E1-03. There are two methods of setting the V/f pattern: Select
one of the 14 pattern presets (set value: 0 to D), or set a user-defined V/f pattern (set value: F).
The default for E1-03 is F. The contents of E1-03 when factory-set to F are the same as when E1-03 is set to 1.
Use the table below when selecting one of the preset V/f patterns.
* The torque is protected by the fully automatic torque boost function, so normally there is no need to use this pattern.
When selecting one of the patterns shown above, the value set to parameters E1-04 to E1-10 will automati-
cally change to fit the V/f pattern selection.
The following pages contain graphs of the V/f characteristics for the preset V/f patterns.
Characteristics Application
Set
Value
Specifications
Constant Torque
Characteristics
This pattern is used in general applications.
Used when the load torque is fixed, regard-
less of rotation speed, for linear transport
systems.
0 50 Hz specifications
1 (F) 60 Hz specifications
2
60 Hz specifications, voltage saturation at
50 Hz
3
72 Hz specifications, voltage saturation at
60 Hz
Variable torque
characteristic
This pattern is used for loads with torque
proportional to two or three times the rota-
tion speed, such as fans and pumps.
4 50 Hz specifications, × 3 decrement
5 50 Hz specifications, × 2 decrement
6 60 Hz specifications, × 3 decrement
7 60 Hz specifications, × 2 decrement
High Startup
Torque (See
Note)
*
Select the high startup torque V/f pattern
only in the following cases.
• The wiring distance between MxC and
motor is large (approx. 150 m min.)
• A large torque is required at startup (ele-
vator loads, etc.)
• A motor that is less than optimum can be
operated.
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
Operation 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