Hitachi S1-00073HFE - Page 114

S1 series standard inverter
-109-
Function
code
Name
Detailed parameter description
Default
value
Modify
coefficient
P03.29
Corresponding
frequency point of
static friction
0.50– P03.31
1.00Hz
○
P04 group V/F control
P04.00
V/F curve setup
of motor 1
This group of function code defines the V/F curve
of motor 1 to satisfy different load characteristics
needs.
0: Straight V/F curve; fit for constant-torque load
1: Multi-point V/F curve
2: Torque down V/F curve (1.3
th
order)
3: Torque down V/F curve (1.7
th
order)
4: Torque down V/F curve (2.0
nd
order)
Curve 2–4 are suitable for torque-variable load of
fan pump and similar equipment. Users can make
adjustment based on load characteristics to
achieve optimal energy-saving effect.
5: Customized V/F (V/F separation); under this
mode, V is separated from f. Users can adjust f
through the frequency reference channel set by
P00.06 to change the curve characteristic, or
adjust V through the voltage reference channel
set by P04.27 to change the curve characteristics.
Note: The V
b
in the figure below corresponds to
rated motor voltage, and f
b
corresponds to rated
motor frequency.
Output voltage
Output frequency
Linear type
Square type
Torque step-down V/F curve (1.3
th
order)
Torque step-down V/F curve (1.7
th
order)
Torque step-down V/F curve (2.0
nd
order)
0
◎
P04.01
Torque boost of
motor 1
In order to compensate for low-frequency torque
characteristics, users can make some boost
compensation to the output voltage. P04.01 is
relative to the maximum output voltage V
b.
P04.02 defines the percentage of cut-off
frequency of manual torque boost to the rated
motor frequency f
b.
Torque boost can improve the
low-frequency torque characteristics of V/F.
0.0%
○
P04.02
Motor 1 torque
boost cut-off
20.0%
○