E6581301
E-12
5
2) Decreasing output voltage
Setting of V/f control mode selection RV
RVRV
RV=
(Voltage decrease curve)
This is appropriate for load characteristics of such things as fans, pumps an d blowers in which the torque in relation
to load rotation speed is proportional to its square.
Base frequency voltage 1
XNX
Output voltage
[V]/[%]
XD
Base frequency XN
0
Output frequency [Hz]
3) Increasing starting torque
Setting of V/f control mode selection RV
RVRV
RV=
(Automatic torque boost)
Detects load current in all speed ranges and automatically adjusts voltage output (torque boost) from inverter.
This gives steady torque for stable runs.
Base frequency voltage 1
XNX
Output voltage
[V]/[%]
Output frequency [Hz]
Base frequency XN
0
:
The torque
boost rate is
adjusted
automatically.
Note: This control system can oscillate and destabilize runs depending on the load. If that should happen, se t V/f
control mode selection RV to (Constant torque characteristics) and increa se torque manually.
"
Motor constant must be set.
The motor constant can be set in any of the following two ways:
1) Automatic setting
Enter the following information that is indicated on the motor namepla te, and then execute the auto-tuning 1
command (Set H to , and then reset H to .).
<Information indicated on motor nameplate>
XN (Base frequency), XNX (Base frequency voltage), H (Motor rated capacity), H (Motor rated
current), H(Motor rated rotational speed)
Refer to 6.22 selection 2.
2) Manual setting
Set each motor constant manually.
Refer to 6.22 selection 3.