Sourcetronic ST600 - Page 160

Frequency Inverter ST600 Series High-Performance Multifunction VFD Function parameter list
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Output voltage
Output frequency
Linear type
Square type
Torque step-down V/F curve (power of 1.3)
Torque step-down V/F curve (power of 1.7)
Torque step-down V/F curve (power of 2.0)
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 max. 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.
Users should select torque boost based on the load, eg,
larger load requires larger torque boost, however, if the
torque boost is too large, the motor will run at over-
excitation, which will cause increased output current and
motor heat-up, thus degrading the efficiency.
When torque boost is set to 0.0%, the VFD is automatic
torque boost.
Torque boost cut-off threshold: Below this frequency
threshold, the torque boost is valid, exceeding this
threshold will nullify torque boost.
Output voltage
Output
frequency
Cut-off
boost
b
f
f
v
v
Setting range of P04.01: 0.0%: (automatic) 0.1%–10.0%
Setting range of P04.02: 0.0%–50.0%
0.0%
○
P04.02
Motor 1 torque
boost cut-off
20.0%
○
P04.03
V/F frequency point
1 of motor 1
When P04.00 =1 (multi-point V/F curve), users can set
V/F curve via P04.03–P04.08.
V/F curve is usually set according to the characteristics
of motor load.
Note: V1<V2<V3, f1<f2<f3. If low-frequency voltage is
set too high, motor overheat or burnt-down may occur,
and overcurrent stall or overcurrent protection may
occur to the VFD.
0.00Hz
○
P04.04
V/F voltage point 1
of motor 1
0.0%
○
P04.05
V/F frequency point
2 of motor 1
0.00Hz
○
P04.06
V/F voltage point 2
of motor 1
0.0%
○
P04.07
V/F frequency point
3 of motor 1
0.00Hz
○
P04.08
V/F voltage point 3
of motor 1
0.0%
○