Motor Controllers AC Variable Frequency Drives
RVBS
Specifications are subjected to change without notice.10/08/2021
20
This function automatically optimizes the output voltage to fit the motor with its load. Under light load, auto
torque boost decreases the output voltage to prevent the motor from over-excitation. Under heavy load, it
increases the output voltage to increase output torque of the motor.
➢
Note: Since this function relies also on the characteristics of the motor, set the base frequency 1 (F04),
the rated voltage at base frequency 1 (F05), and other pertinent motor parameters (P01, P02 and P04
through P10) in line with the motor capacity and characteristics, or else perform auto-tuning (P03).
When a special motor is driven or the load does not have sufficient rigidity, the maximum torque might
decrease, or the motor operation might become unstable. In such cases, do not use auto torque boost but
choose manual torque boost per F30 (F32 = 0 or 1).
Function code
Mod. add.
Description
Def
Min
Max
U.M
R/W
F30
0x001E
Torque Boost
1
50/35
0
200
0.1%
R/W
F32
0x0020
Torque Boost
1 Mode Select
1
0
2
-
R/W
4.2.3
Frequency limiter
F13 and F14 specify the upper and lower limits of the output frequency, respectively.
➢
When you change the frequency limiter (High) (F13) in order to raise the reference frequency, be sure to
change the maximum frequency (F03) accordingly.
➢
Maintain the following relationship among the data for frequency control: F13 > F14, F13 > F18, F13 >
F20, and F03 > F14. Where, F18 is of the starting frequency and F20 is of the stop frequency. If you
specify any wrong data for these function codes, the inverter may not run the motor at the desired speed
or cannot start it normally.
Function
Code
Mod.
add.
Description
Def
Min
Max
U.M.
R/W
F13
0x000D
Frequency Limiter (High)
1000
0
1200
0.1Hz
R/W
F14
0x000E
Frequency Limiter (Low)
0
0
1200
0.1Hz
R/W
4.2.4
Speed profile
4.2.4.1
Acceleration/Deceleration
RVBS has been designed with a programmable speed profile for adaptation to the features requested on
compressors control. The profile is designed by a linear ramp trends, defined via the acceleration/deceleration
parameter.
