KEB COMBIVERT F5 BASIC Applications Manual page 199

Protective Functions
Description for F5-S
Bild 6.7.8.c Tripping time for F5-S
Formeln für den
Überlastfaktor
Motorschutzfunktion Pegel
(Pn.15)
Motorschutzfunktion Reaktion
(Pn.14)
© KEB Antriebstechnik, 2002
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.
s
0,6
0,5
0,4
0,3
0,2
0,1
2,5 3
Inverter apparent current (ru.15)
Overload factor = ----------------------------------------
Rated current
(Motor rated current (dr.23) - Standstill current (dr.28)) • Real speed
Continuous current = ---------------------------------------------------------------------------------------------- + Standstill current (dr.28)
Continuous current = Motor rated current (dr.23), if real speed > Motor rated speed (dr.24)
A level of 0...100 % of the tripping time is adjustable with Pn.15. On reaching the
adjusted level, the switching condition „OH2-warning" is set (also see „Digital outputs").
The response to the warning signal is defined with Pn.14.
This parameter determines the behaviour of the drive if the motor protective function
responds. The function is described in Chapter 6.7.6.
Name: Basis
KEB COMBIVERT F5
Functional Description
3,5 4 4,5
Motor rated speed (dr.24)
Datum
18.04.02
Is/Id
5 5,5
Kapitel Abschnitt Seite
17
6 7 17
6