INVT Goodrive350-19 Series Operation Manual page 181

Goodrive350-19 Series VFD for Crane
Function
Name
code
motor 1
Torque boost cut-off
P04.02
of motor 1
V/F frequency point
P04.03
1 of motor 1
V/F voltage point 1
P04.04
of motor 1
V/F frequency point
P04.05
2 of motor 1
V/F voltage point 2
P04.06
of motor 1
Description
torque characteristics, you can make some
boost compensation for the output voltage.
P04.01 is relative to the max. output voltage V
P04.02 defines the percentage of cut-off
frequency of manual torque boost to the rated
motor frequency f . Torque boost can improve
b
the low-frequency torque characteristics of V/F.
You need to select torque boost based on the
load. For example, larger load requires larger
torque boost, however, if the torque boost is too
large, the motor will run at over-excitation,
which may cause increased output current and
motor overheating,
efficiency.
When torque boost is set to 0.0%, the VFD
uses automatic torque boost.
Torque boost cut-off threshold: Below this
frequency threshold, torque boost is valid;
exceeding this threshold will invalidate torque
boost.
Output voltage
v
b
v
boost
Setting range of P04.01: 0.0%: Automatic;
0.1%–10.0%
P04.02 setting range: 0.0%–50.0%
When P04.00 = 1 (multi-dot V/F curve), you can
set the V/F curve through P04.03–P04.08.
The V/F curve is generally set according to the
load characteristics of the motor.
Note: V1 < V2 < V3, f1 < f2 < f3 Too high
voltage for low frequency will cause motor
overheat or damage
overcurrent stall or overcurrent protection.
-169-
thus decreasing
Output
frequency
f f
Cut-off
and cause
Function parameters
Default Modify
.
b
the
○
20.0%
○
0.00Hz
○
00.0%
○
0.00Hz
VFD
○
0.0%