5
ANTRIEBSTECHNIK
6
7
5
KEB COMBIVERT F4-C
Name: Basis
12.03.99
6
Keep on Running Functions
©
KEB Antriebstechnik, 1997
All Rights reserved
Functional Description
Section
Page
Date
Chapter
6.7.2
Maximum Constant
Current (Stall-
function)
The Stall-function protects the frequency inverter against switch off due to overcurrent
in constant operation at fset=factual and at constant output frequency. It is activated
with Pn.12 and adjustable in the range of 10…199 % (200 = off) of the rated inverter
current. On attaining the adjusted load limit and in dependence on the selected
characteristic the frequency is decreased/increased according to the ramp time
adjusted in Pn.14 until falling below the overload limit. When the load has fallen below
he maximum ramp current, it is accelerated again with the normal ramp time.
Picture 6.7.2.a
Principle of constant current limit
see „Digital outputs“ do.1...do.4 „Value 8“
n
M
Value 0 = off
Value 1 (5)
Value 3 (7)
Value 2 (6)
Value 4 (8)
Pn.12 Mode
Negative torque-/speed-characteristic
To reduce the load the frequency must be
increased
e.g. drilling machines
n
M
Positive torque-/speed-characteristic
e.g. fans
To reduce the load the frequency must be
decreased
Pn.14 ramp time
Pn.13 max. constant current
Activation when exceeding max constant current
At bracket values the
function is active during
the ramp too
0,0...300,0 sec
10...199%; 200 = off
Pn.14
t
oP.8
oP.9
f1
t
oP.2
(oP.7)
f1
Pn.14
t
uF.9
f1
Pn.14
t
f1
oP.4
(oP.6)
Pn.14
