E6582233
E-19
5
2) Setting for fans and pumps
Setting of V/F control mode selection
to
(variable torque)
This is appropriate for load characteristics of such things as fans, pumps and blowers in which the torque in
relation to load rotation speed is proportional to its square.
O
u
tput
v
o
lt
age(
%
)
Base frequency voltage
Base frequency
0
Output frequency (Hz)
3) Increasing starting torque
Setting of V/F control mode selection
to
(automatic torque boost control)
Detects load current in all speed ranges and automatically adjusts voltage output (torque boost) from inverter.
This gives steady torque for stable runs.
:
Automatically
adjusts the
amountof torque
boost
.
O
u
tput
v
o
lt
age(
%)
Base frequency
voltage
Output frequency
(Hz)
Base frequency
0
Note: This control system can oscillate and destabilize runs depending on the load. In this case, set
V/F mode selection
=
(V/F constant) and increase manual torque boost
.
