Toshiba Tosvert VF-AS1 - Manual (Page 151)

E6581301
F-39
6
■ Examples of setting the motor constants
Here are setting examples for each of the selections 1, 2 and 3 described in Section 6.22.
a) Combination with a Toshiba standard motor (4P motor with the same capacity as the
inverter)
Inverter : VFAS1-2037PL
Motor
: 3.7kW-4P-60Hz
[Selection 1]
Set the automatic torque boost (CW) at .
[Selection 2]
1) Set the V/f control mode selection RV at  (Sensorless vector control).
2) Set the auto-tuning 1 (H) at . (When the cable length is 30m or over.)
b) Combination with a standard motor other than the above Toshiba motor
Inverter : VFAS1-2037PL
Motor
: 2.2kW-2P-50Hz
[Selection 1]
Set the automatic torque boost (CW) at .
[Selection 2]
1) Set the V/f control mode selection RV at  (Sensorless vector control).
2) Set XN, XNX, H, H and H, as specified on the motor nameplate.
3) Set the auto-tuning 1(H) at .
4) Set the auto-tuning 1 (H) at .
6.23 Increasing the motor output torque further in low speed range
H : Exciting strengthening coefficient
H : Stall prevention factor
The output torque of the motor can adjusted using the parameters described in 6.22 in most cases, but if a finer
adjustment is required, use these parameters.
[Parameter setting]
Title Function Adjustment range Default setting
H Exciting strengthening coefficient  ~% 
H Stall prevention factor  ~ 
If the torque needs to be increased in low speed range (10Hz or less as a guide)
Perform auto-tuning according to the instructions in 6.22, and if the torque needs to be increased further in low
speed range, first increase the slip frequency gain (H) to a degree (80% or so as a guide) that hunting of the
motor does not occur. Then, increase motor constant 1 (H) by 1.1 times the current value as a guide. If the
torque needs to be increased even further, increase the exciting current factor (H) to a maximum of 130%.
H
is a parameter that increases the magnetic flux of the motor at low speeds, so specifying a higher value for
H increases the no-load current. If the no-load current exceeds the rated current, do not adjust this parameter.
If the motor stalls when operated at frequencies above the base frequency
Adjust H (stall prevention factor).
If a heavy load is applied momentarily (transiently), the motor may stall before the load current reaches the stall
prevention level (H). In such a case, a motor stall may be avoided by reducing the value of H gradually.