Inovance MD330H - Page 158

MD380 User Manual Desc
ription of Function Codes
- 157 -
Function Code Parameter Name Setting Range Default
F3-01 Torque boost 0.0%–30%
Model
dependent
F3-02
Cut-off frequency of
torque boost
0.00 Hz to maximum output
frequency
50.00 Hz
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 F3-01.
If the torque boost is set to too large, the motor may overheat, and the AC drive may suffer
overcurrent.
If the load is large and the motor startup torque is insufcient, increase the value of F3-01.
If the load is small, decrease the value of F3-01. If it is 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.
F3-02 specifies the frequency under which torque boost is valid. Torque boost becomes
invalid when this frequency is exceeded, as shown in the following gure.
Figure 6-4 Manual torque boost
Output
frequency
Output
voltage
Vb
fbf1
V1
f1: Cutoff frequency of
manual torque boost
fb: Rated running
frequency
Vb: Maximum
output voltage
V1: Voltage of
manual torque boost
Function Code Parameter Name Setting Range Default
F3-03 Multi-point V/F frequency 1 (F1) 0.00 Hz to F3-05 0.00 Hz
F3-04 Multi-point V/F voltage 1 (V1) 0.0%–100.0% 0.0%
F3-05 Multi-point V/F frequency 2 (F2) F3-03 to F3-07 0.00 Hz
F3-06 Multi-point V/F voltage 2 (V2) 0.0%–100.0% 0.0%
F3-07 Multi-point V/F frequency 3 (F3)
F3-05 to rated motor
frequency (F1-04)
Note: The rated frequencies
of motors 2, 3, and 4 are
respectively set in A2-04, A3-
04, and A4-04.
0.00 Hz
F3-08 Multi-point V/F voltage 3 (V3) 0.0%–100.0% 0.0%