E6581301
E-4
5
1) Increasing torque automatically according to the load
Set the automatic torque boost CW
CWCW
CW=
(automatic torque boost+auto-tuning 1)
Automatic torque boost CW= detects load current in all speed ranges and auto matically adjusts voltage output
from inverter. This gives steady torque for stable runs.
Note 1: The same characteristic can be obtained by setting the V/f control mode selection paramet er RV to
(automatic torque boost) and H (auto-tuning 1) to . Refer to Section 6.22.
Note 2: Setting CW to automatically programs R V to .
Note 3: If stable operation cannot be achieved with this setting, set the parameters XN (base freq uency), XNX
(base-frequency voltage), H (rated capacity of motor), H (rated current of motor) and H
(rated number of revolutions of motor) as specified on the motor nameplate , and then set H to
and CW to again.
2)
When using vector contr ol (increasing startin g torque and high-pr ecision operations)
Set the automatic torque boostCW
CWCW
CW=
(sensorless vector control 1+auto-tuning 1)
Setting automatic torque boost CW= (Sensorless vector control 1+auto-tuni ng 1) provides high starting torque
bringing out the maximum in motor characteristics from the low-speed range. This suppresses changes in motor
speed caused by fluctuations in load to provide high precision operati on. This setting is most suitable for transfer
and lifting systems that are operated in speed control mode.
Note 1: The same characteristic can be obtained by setting the V/f control mode selection paramet er RV to
(Sensorless vector control 1) and H (Auto-tuning 1) to . Refer to Section 6.22.
Note 2: Setting CW to automatically programs R V to .
Note 3: If stable operation cannot be achieved with this setting, set the parameters XN (base freq uency), XNX
(base-frequency voltage), H (rated capacity of motor), H (rated current of motor) and H
(rated number of revolutions of motor) as specified on the motor nameplate , and then set H to
and CW to again.
■
■■
■CW
CWCW
CW (automatic torque boost) and RV
RVRV
RV (V/f control mode selection)
Automatic torque boost is the parameter for setting V/f control mode selectio n (RV) and auto-tuning 1 (H)
together. That is why all parameters related to change automatically when CW is chang ed.
Automatically programmed parameters
CW RV H
Disabled (Always is displayed.) –
Check the programmed
value of RV. (If CW is not
changed, it becomes (V/f
constant).)
–
Automatic torque boost+auto-tuning 1
Automatic torque boost : Executed ( after
execution)
Sensorless vector control 1+auto-tuning 1
Sensorless vector control 1 : Executed ( after
execution)
3) Increasing torque manually (V/f constant control)
The VF-AS1 inverter is set to this control mode by factory default.
This is the setting of constant torque characteristics that are suited for such things as conveyors. It can also be used
to manually increase starting torque.
To return to V/f constant control after changing the CW setting:
Set the V/f control mode selection parameter
RV
RVRV
RV
=
(constant torque characteristic).
Refer to Section 5.6.
Note: If you want to increase torque further, raise the setting value of manual torque boost XD.
How to set manual torque boost parameter XD Refer to Section 5.7.
If vector control cannot be programmed....
First read the precautions about vector control in 5.6, 9).
1) If the desired torque cannot be obtained Refer to 6.22 selection 3.
2) If auto-tuning error “GVP” appears Refer to 13.1 and 6.22 selection 3.