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KEB COMBIVERT F5
Name: Basis
04.05.04
6
Abschnitt
Seite
Datum
©
KEB Antriebstechnik, 2002
All rights reserved
Kapitel
Functional Description
Protective Functions
Description for F5-S
The internal overload counter counts downwards (100 % to o % in 5 s) with overload
factors < 300 %. Above 300 % it is counted upwards according to following
characteristic.
The tripping time is 200...500 ms; at overload factors above 500 % it is always 200
ms. If an error is triggered, it can be reset immediately. However, in this case the
tripping time can be very short, since the counter decrements only slowly.
Fig. 6.7.8.c Tripping time for F5-S
0,1
0,2
0,3
0,4
0,5
3,0
4,0
5,0
6,0
7,0
8,0
t [s]
Is/Id
Imax/In = 5
dr.34 = 0,5 s
dr.35 = 0,2 s
Imax/In = 8
dr.34 = 0,5 s
dr.35 = 0,2 s
Imax/In = 8
dr.34 = 0,5 s
dr.35 = 0,4 s
Imax/In = 8
dr.34 = 0,5 s
dr.35 = 0,4 s
With Pn.15 a level of 0...100 % of the final counter value can be adjusted. On reaching
the adjusted level, the switching condition „OH2-warning“ (also see „Digital Outputs“)
is set. Pn.14 determines the response to the warning level.
Pn.14 specifies the performance of the drive on activation of the motor protective function.
The function is descrived in Chapter 6.7.6.
This parameter displays the tripping time at a ratio of apparent current to continuous
current (Is/Id) of 300 % (adjustable with V2.5 and upwards).
This parameter displays the tripping time at apparent current = maximum current (Is =
Imax) (adjustable with V2.5 and upwards).
The time, that must expire after triggering an OH2-error, before the error can be reset,
is adjusted in dr.36.
Motor protective function
level (Pn.15)
Motor protective function
response (Pn.14)
n
Id = (In - Id0) * — + Id0
nn
Mmax
Imax = In * ———
Mn
Id:
continuous current
Id0:
continuous standstill current (dr.28)
In:
rated motor current (dr.23)
n:
actual speed
nn:
rated motor speed (dr.24)
Imax:
maximum current
In:
rated motor current (dr.23)
Mmax: maximum torque (dr.33, limited to
dr.15)
Mn:
rated motor torque (dr.27)
Calculation of continuous
current
Calculation of maximum
current
Motor protective time at
300 % Id (dr.34)
Motor protective time at Imax
(dr.35)
Motor protection recovery
time (dr.36)