KEB COMBIVERT F5 BASIC - Page 155

6
45
KEB COMBIVERT F5-G / B
Name: Basis
06.02.02
6
© KEB Antriebstechnik, 2002
All rights reserved
Functional DescriptionSet Value and Ramp Adjustment
Section PageDate Chapter
Adjustment of the setpoint value from the output of the technology controller (see
6.12).
Adjustment of the setpoint value via one of the two speed measurements (see
6.10).
The cycle time of the software is 1 ms (BASIC: 2). During this time the analog
input/output status is updated once. Additionally the inverter requires a processing
time of 1...3 ms before the new setpoint value is calculated. If the inverter is used
as secondary final control element of a superior control, this time can impair the
dynamics of the entire closed-loop control system.
In such cases the analog setpoint value can be processed directly to the control
processor (direct setpoint adjustment). Thus a sampling time of 250 µs is possible.
To enable this fast response to an analog setpoint value, some restrictions must
be accepted:
• The setpoint limitations oP. 6 / oP. 7 / oP. 11 do not have any function; the
frequency setpoint is only limited by oP. 14 (for both directions).
• The calculation formula of the analog setpoint value changes. The parameters
oP.6 / oP. 7 are without influence on the setpoint calculation.
n
set
= (analog value/10V * 100% - An. 6) * An. 5 * oP.10
• The acceleration / deceleration and S-curve time have no effect; it is operated
internally without ramps.
• The parameters An.1...4 and An. 7...9 are without any function.
• The maximal filter time for the analog inputs is 2 ms.
Direct analog setpoint adjustment
(AN1 direct)
(not at B-control)
Output external PID-controller
Speed measurement
(not at B-control)