KEB COMBIVERT F5 MULTI Applications Manual page 163

Setpoint- and Ramp Adjustment
System parameters
Output external PID-controller
Speed measurement
Direct analog setpoint adjustment
(AN1 direct)
High-resolution reference setting
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Adjustment of absolute setpoint speed in rpm (SY.52) via the system parameters.
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. 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:
ï The setpoint limitations oP. 6 / oP. 7 / oP. 11 do not have any function; the speed
setpoint is only limited by oP. 14.
ï The calculation formula of the analog setpoint value changes. The parameters
oP.6 / oP. 7 are without influence on the setpoint calculation.
n = (analog vlue/10V * 100% - An. 6) * An. 5 * oP.10
set
ï The acceleration / deceleration and S-curve time have no effect; it is operated
internally without ramps.
ï The parameters An.1...4 and An. 7...9 are without any function.
ï The maximal filter time for the analog inputs is 2 ms.
ï The stop position controller cannot be activated.
The reference value is determined as follows from oP.63 and oP.64 at oP.0 = 10
(internal resolution):
Ref. value (high-resolution) = 0P.64 * resolution factor * oP.63/ 2^14
A 32-bit-value results from this modulation. The upper 16 bits are processed directly
(modulator or speed controller reference value). The lower 16 bits are integrated. In
case of an overflow the value of the upper 16 bits is increased by 1, so a fine value
results in the midrange.
Example oP.0 = 10
oP.64 = 100 Hz
Resolution factor = 80 Hz
oP.63 = 150994
Name: Basis
KEB COMBIVERT F5-M / S
Functional Desription
Date
12.05.04
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