ANTRIEBSTECHNIK
6
2
9
KEB COMBIVERT F4-F
Name: Basis
17.09.98
Functional Description
Analog In- and Outputs
Chapter
Section
Page
Date
©
KEB Antriebstechnik, 1998
All Rights reserved
6
-10%
10%
10%
-10%
t
t
Through capacitive or inductive coupling onto the input lines or voltage fluctuations of
the signal source the motor connected to the inverter may drift in standstill position
inspite of analog input filters. It is the task of the zero point hysteresis to suppress
this. With the parameters An.2 and An.8 the corresponding analog signals at
the
output of the characteristic amplifier
can be suppressed in a range of 0...10%.
For this applies:
0 % ^
=
0 rpm
10 % ^
=
Maximal speed (SP.5 / SP.7) * 0,1
6.2.5
Zero Point Hystere-
sis of Analog Inputs
(An.2 / An.8)
This function is provided with a switching hysteresis of 50 %.
If the analog signal is larger than the adjusted hysteresis value (An.2 / An.8), then the
analog setpoint is active. When the analog signal falls below 50 % of the adjusted
hysteresis value, the analog setpoint is set to value 0. .
from characteristic amplifier
for further signal processing
suppressed range
Fig. 6.2.8
Zero point hysteresis
Fig. 6.2.9
Zero point hysteresis
Parameter assignment
Analog
signal
Analog
signal
adjusted
analog
setpoint
effective
analog setpoint
An.2 / An.8
0,5 x (An.2 or An.8)
An.2 / An.8
0,5 x (An.2 or An.8)
Mode of functioning
Input
Parameter
Value range
Resolution
Default value
REF1 ±
An.2
0...10 %
0,1 %
0,2 %
REF2 ±
An.8
0...10 %
0,1 %
0,2 %