Speed Abnormality Detect Function; Accuracy Of Speed Control - Toshiba TOSVERT VF-AS1 Instruction Manual

4.1.7.Speed abnormality detect function

* Parameter
Title
f622 Abnormal speed detection time
f623 Overspeed detection frequency upper band
f624 Overspeed detection frequency lower band
* Functions
When operating the speed control with sensor (pt = 7, 8 *), include during stop condition,
the feedback speed is observed. When the timer count of speed error is over the setting time,
the system trips by a speed error (e-13).
Output frequency［Hz］
* This function is reserved in VF-PS1.

4.1.8.Accuracy of speed control

The accuracy of speed control with the PG feedback can be obtained by the following for-
mulae.
Accuracy of speed control = Command frequency accuracy + feedback detection accuracy
Command frequency accuracy = ±
(using digital command)
Feedback detection accuracy = ±
F
C
P
PG
PH
R
T
Function Name
０
f622
0.01(Hz)
F (Hz)
c
( F ( P
C
: Inverter output frequency
: Number of motor poles
: Number of PG pulses/rotation
: Single Phase = 1,
: Refer to below table
Inverter capacity
- 2.2kW
3.7kW - 7.5kW
11kW -
Adjustment Range
0.01 - 100.00sec
0.0: Disabled, 0.1 - 30Hz
0.0: Disabled, 0.1 - 30Hz
Output frequency
f623
f624
e-13 trip (speed error)
Time［s］
f622
1
［%］
x 100 x
2
1
× × ×
2 )) PG PH ( / 1
Two-Phase = 4
Speed response R
300 rad/s
180 rad/s
90 rad/s
16
E6581319
Feedback speed
1
［%］
X 100 X
R ) 2
T
T

Setting at
Shipment
0.01
0.0
0.0