Accuracy Of Speed Control; Easy Positioning Pid Control - Toshiba TOSVERT VF-AS3 Option Instruction Manual

■ Functions
If speed feedback (Estimated speed) > (Output frequency + <F623>) or speed feedback (Estimated speed) < (Output
frequency - <F624>), and a certain period of time set with <F622: Abnormal speed detection time>, a trip occurs.
You can provide range for a detection level of a trip with a setting of <F623: Abnormal speed increase band> and <F624:
Abnormal speed decrease band>.
During torque control, if speed feedback (Estimated speed) > (Speed upper limit + <F623>) or > (Speed lower limit
- <F624>) a certain period of time set with <F622: Abnormal speed detection time>, "E-13" trip occurs.
Output frequency [Hz]

3.1.5 Accuracy of speed control

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 =
F : Inverter output frequency
C
P : Number of motor poles
PG : 2048
PH : 4
R : Speed response, see the value in the table below as a reference
T

3.1.6 Easy positioning PID control

■ Functions
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.
0
<F622>
0.01 (Hz)
±
F (Hz)
c
±
/ (P / 2)) × PG × PH × (1 / R
(F
C
Motor capacity
- 2.2 kW
3.7 kW - 7.5 kW
11 kW -
Output frequency
<F623>
<F624>
Feedback speed
"E-13" Trip (speed error)
Time [s]
<F622>
1
× 100 × [%]
2
1
× 100 ×
)
T
Speed response R
300 rad/s
180 rad/s
90 rad/s
16
E6582171
1
[%]
2
T