KEB COMBIVERT F5 MULTI Applications Manual page 219

Protective Functions
Description for F5-S
Fig. 6.7.8.c Tripping time for F5-S
Calculation of continuous
current
Calculation of maximum
current
Motor protective function
level (Pn.15)
Motor protective function
response (Pn.14)
Motor protective time at
300 % Id (dr.34)
Motor protective time at Imax
Motor protection recovery
time (dr.36)
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All rights reserved
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.
t [s]
0,5
0,4
0,3
0,2
0,1
3,0
Id = (In - Id0) * — + Id0
Mmax
Imax = In * ———
Mn
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 =
(dr.35)
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.
Name: Basis
KEB COMBIVERT F5
Functional Description
Imax/In = 8
dr.34 = 0,5 s
dr.35 = 0,2 s
Imax/In = 5
dr.34 = 0,5 s
dr.35 = 0,2 s
4,0 5,0
n
Id:
nn
Id0:
In:
n:
nn:
Imax: maximum current
In:
Mmax: maximum torque (dr.33, limited to
Mn:
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
6,0 7,0
continuous current
continuous standstill current (dr.28)
rated motor current (dr.23)
actual speed
rated motor speed (dr.24)
rated motor current (dr.23)
dr.15)
rated motor torque (dr.27)
Datum Kapitel Abschnitt
6
04.05.04
6
Is/Id
8,0
Seite
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