Toshiba TOSVERT VF-AS3 Instruction Manual page 24

3. 1. 5
The accuracy of speed control with the PG feedback can be obtained by the following formulae.
Accuracy of speed control = Command frequency accuracy + feedback detection accuracy
Command frequency accuracy = ±
(using digital command)
Feedback detection accuracy = ±
3
3. 1. 6
* Functions
9
This function, which is aimed at a retaining the load at standstill at its normal stop position, is used
along with the speed sensor vector control function to prevent the position of an elevator at standstill
from shifting.
Switching to position control takes place when the load is at a standstill.
The settings of these parameters take effect only in sensor speed control mode.
Please refer to E6582112 in detail.
3. Functional Description
Accuracy of speed control
0.01 (Hz)
F
C
/(P/2)) x PG x PH x (1/R
(F
C
Fc : Inverter output frequency
P : Number of motor poles
PG : Number of PG pulses/rotation
PH : 4
R : Refer to below table
T
Inverter capacity
2.2kW or less
3.7kW to 7.5kW
11kW or more
Easy positioning PID control
1
x 100 x [%]
(Hz) 2
1
x 100 x
)
T
Speed response R
300 rad/s
180 rad/s
90 rad/s
3-6
E6582148
1
[%]
2
T