abc 2000 Series User Manual page 52

I n this mode, V and F are proportional and the proportional
relationship can be set in P4.13. The relationship between V and F
is also related to the rated motor voltage and rated motor frequency
in Group P2.
Assume that the voltage source input is
relationship between V and F is: V/F = 2 •
(Rated motor frequency)
T orque boost
P4.01
Setting Range
Cut-of!'
torque boost
P4.02
Setting Range
To compensate the low frequency torque characteristics of V/
F control, you can boost the output voltage of the AC drive at low
frequency by modifying P4.01 . If tho torque boost is sot to tao large,
the motor may overheat, and the AC drive may suffer over current. If
the load is large and the motor startup torque is insufficient, increase
the value of P4.01. If the load is small, decrease the value of P4.0 1 .
I f i t i s set to 0.0, the AC drive performs automatic torque boost. In
this case, the AC drive automatically calculates the torque boost
value based on motor parameters including the stator resistance.
P4.02 specifies the frequency under which torque boost is valid.
Torque boost becomes invalid when this frequency is exceeded, as
shown in the following figure.
Output voltag
f1: Cutoff frequency of manual torque boost fb: Rated running
frequency
Multi�point V/F
frequency
P4.03
u
freq ency of
Vb
Figure 4-5 Manual torque boost
1
{F1)
Detailed Function
X
• (Rated motor voltage)/
Default I Model dependent
0.0%-30%
Default
O.OOHz-maximum output frequency
fl ib
Default
0.00Hz-P4.05
X {O to 100%), the
Vb:M!Wmum
oolputvcltage
VI: voltage of
manual torqi.w boost
Output hque:acy