KEB COMBIVERT F4-F Applications Manual page 137

Set Value and Ramp Adjustment
Setpoint values
Analog setpoints:
Digital setpoints:
(SP .1, SP .2)
Direct analog setpoint input
(SP . 0 = 18)
AUX function (An.13)
© KEB Antriebstechnik, 1999
All Rights reserved
To adjust a speed setpoint the KEB COMBIVERT F4-F provides two analog setpoint
values (REF1 +/- and REF2 +/-) and three digital setpoint values (parameter SP.1,
parameter SP .2 and the motor potentiometer function).
The analog setpoint values are adjusted by way of REF1 +/- or REF2 +/-. Internally
the setpoint signals on REF1 change to REF-internal and on REF2 to AUX-internal.
The setpoint values are indicated in the parameters ru.22 and ru.23.
Concerning adjustments and analog setpoint settings refer to Chapter 6.2 „Ana-
log In- and Outputs".
1. With parameter SP.1 „Absolut digital setpoint setting" a setpoint speed of
-9999,5 rpm ... +9999,5 rpm can be adjusted.
2. With parameter SP.2 „Percentual digital setpoint setting" a setpoint speed of
-100% ... +100% of the maximum speed (SP .5 / SP .7) can be adjusted (also see
6.4.3 „Setpoint calculation")
3. With the motor potentiometer function a setpoint speed between the values
adjusted in parameter SP .4 / SP .5 and SP .6 / SP .7 (see 6.7 „Special functions")
can be adjusted in rpm by way of digital inputs.
Only available in the standard-/synchronous module (Pc.0 = 0), is handled in the
positioning module like SP .0 = 2 (standard analog setpoint input):
The cycle time of the software is 2,048 ms. During this time the analog input/output
status is updated once. Before the new setpoint is calculated, the inverter additionally
needs a processing time of 1...3 ms. When the inverter is used as an underlayed
control element of a master control, this time can have an influence on the dynamic
of the closed-loop control.
For these cases the analog setvalue can be given directly to the control processor
(direct setvalue input). A scan time of 128 µs is possible by this. Some restrictions
must be taken into consideration to realize this fast reaction of an analog setvalue:
• The speed limits SP. 4...SP . 7 do not have a function; the speed setvalue is only
limited with SP . 8 and SP . 9.
• The calculation formula of the analog setvalue changes. Parameter SP . 4...SP . 7
do not have an influence to the setvalue calculation. The reference point of the
setvalue calculation is 3000 rpm.
nset = (analog value/10V * 100% - An. 4) * An. 3 * 3000 rpm
• Acceleration/deceleration and S-curve times do not have an influence (SP .11 to
SP .18); internal processing without ramps.
• Zero clamp speed (An. 2) and REF1 Offset Y (An. 5) do not have a function
• The Aux-input can not be assigned with the function 1 (AUX works added to the
setvalue).
• The max. filter time for the analog inputs is 2 ms (An.1 = 4).
• The position standstill controller can not be activated.
The AUX-function offers the possibility to add an analog setpoint to the other setpoint
settings within the preadjusted maximum values (see 6.4.3 „Setpoint calculation")
or to use it as amplification factor for speed controllers as well as for torque limits.
Parameter An.13 defines the function of the AUX-internal signal.
An.13 AUX-internal
0 no function
1 is added to the selected setpoint signal (analog or digital)
setpoint = setpoint signal + AUX-internal signal (-10 V ... +10 V)
2...6 see chapter 6.8.3 AUX-function
Name: Basis
KEB COMBIVERT F4-F
Functional Description
Date
16.03.99
ANTRIEBSTECHNIK
Chapter Section Page
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