KEB COMBIVERT F4-C Applications Manual page 173

Special Functions
Fig. 6.9.3.c Adjustment of Jump Factor
Optimal setting
f,U
A
B
A: DC-lin voltage B: Output frequency
Jump Factor
(Pn.38)
Fig. 6.9.3.d Power-Off Control
Pn.42 DC-link set value
Automatic DC-
Automatic (199)
link set value
Setting 200...800V
DC-link actual value
Power-Off Control
© KEB Antriebstechnik, 1997
All Rights reserved
Jump factor too low
f,U
A
B
t
By means of the jump factor the automatically determined starting jump can be adapted
to the respective application.
In case the jump factor is too low, the inverter trips to UP!
In case the jump factor is too high, the inverter runs into the hardware current limitation.
The control cannot work correctly, thus causing a wrong calculation of the active
current!
DC-link set
value ramp
Pn.34 DC-link /
P-component
+
-
DC-link difference
measured
active current
1. Buffering of short-time power failures:
The drive shall be kept running for as long as possible with the available energy,
in order to continue the operation upon voltage recovery. This is particularly
suited for large flywheel masses. The DC-link voltage is the controlled variable
onto which it is regulated with the setpoint value as manipulated variable.
2. Emergency Stop:
The drive shall be brought to a standstill before the inverter switches off. The
active current is the control variable onto which it is regulated with the setpoint
value as manipulated variable
First the setpoint DC-link voltage is adjusted with Pn.42. This is the value with which
the regulation takes place.
Name: Basis
KEB COMBIVERT F4-C
Functional Description
Jump factor too high
f,U
A
B
t
Pn.36 Iw P-component
Pn.18 Braking forque
Pn.37 Iw I-component
0 (default)
+
0,1...100,0%
-
Date
29.01.98
ANTRIEBSTECHNIK ANTRIEBSTECHNIK
t
Delta-
frequency
Chapter Page
Section
9
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6