KEB COMBIVERT F5 MULTI Applications Manual page 254

Functional Description
KP (UZK) (Pn.51)
KI (UZK) (Pn.57)
Power off KP (Pn.53)
Power off KI (Pn.54)
Power off KD (Pn.55)
Fig. 6.9.6.d Behaviour at power recovery
power recovery
fout > fmin
Pn.44 Bit 3...4
Set value
Starting voltage
Braking torque Pn.47
increased voltage setpoint
(Pn.50)
increased voltage setpoint
if fout < Pn.48
Behaviour at power recovery
Restart value
(Pn.48)
Chapter Section Page
6 9 22
In order to better adapt the drive individually to the application, the proportional factor
of the DC-link voltage controller can be adjusted with Pn.51 and the integral factor
with Pn.57 (not at F5-B/C). In most cases the default setting will achieve sufficient
results. But if it comes to overshoots or if the motor looses synchronism the value
must be reduced.
Pn.53 to Pn.55 are the control parameters of the active current control and the slip
control. The active current control is active at C2.1 = 2 (actual value = calculated
value), the slip control is active at CS.1 = 0 or 1 (actual value = measured value of
channel 1 or 2).
At the active current control (without speed control) a D-part in the control has a
positive effect. Pn.55 should have approx. 10-times the value of Pn.53.
Since the hardware current limit should not be reached with active current control, the
setpoint value is limited internally which can lead to oscillations. In that case the
setpoint value can be reduced, which leads to a prolongation of the delay.
If the voltage stabilisation is switched on (Pn.44 Bit 8 = „1") and uf.9 = rated voltage,
the voltage is not so high and the deceleration becomes more uniform.
At the slip control (with speed detection) the D-part is unfavorable. Pn.55 should be
set on 0.
no
yes
yes
fout > fmin
Fast stop
0
fout > Pn.48
3
Linear lowering from f < Pn.48
1
Pn.50 increased voltage setpoint
2
The following parameters effect the behaviour of the inverter if the system voltage returns
during the Power-Off-function
Dependent on the application the restart makes may only be sensible up to a certain
value. This restart value is adusted in Pn.48.
Dependent on the setpoint value source (Pn.44 Bit 6-7) following conditions occur:
1. Regulation of the starting voltage (Pn.44 Bit 6-7 = 0):
If the output value is larger than the restart value, the restart is carried out upon
power recovery. The output value is kept constant during the restart delay (Pn.52).
Date Name: Basis
04.05.04 KEB COMBIVERT F5
no
no
yes
fout > fmin
no
ja
Pn.52 restart delay
no
yes
fout > Pn.48
Special Functions
Pn.44 Bit 3...4
behaviour at power recovery
0
2
1
© KEB Antriebstechnik, 2002
All rights reserved
PLS
POFF
Restart