KEB COMBIVERT F5 BASIC Applications Manual page 198

Functional Description
Motor protection mode
(dr.11)
Motor protection / rated
current (dr.12)
OH2 stopping mode (Pn.14)
Fig. 6.7.8.b Tripping times for F5-B, F5-G and F5-M
For self-ventilated
tripping times decrease with the
frequency of the motor (see picture).
The motor protective function acts in-
tegrating, i.e. times with overload on
the motor are added, times with
underload are substracted. After
triggering the motor protective
function, the new tripping time is
reduced to 1/4 of the specified value,
if the motor has not been operated
for an appropriate
underload.
Chapter Section Page
6 7 16
The cooling mode of the motor is adjusted with these programmable parameters.
Value Function
0 Separate cooling (default)
1 Self-cooling
This parameter specifies for each set the rated current (= 100% utilization) for the
motor protective function. The motor protection-load is calculated as follows:
Motor protection-load =
This parameter determines the behaviour of the drive when the motor protective
function responses. The function is described in Chapter 6.7.6.
Tripping time
120 min
motors the
60 min
30 min
2 min
time with
1 min
30 sec
5 sec
Date Name: Basis
18.04.02 KEB COMBIVERT F5
Inverter Apparent current(ru.15)
Motor protection rated current (dr.12)
f ≥ Rated motor frequency or
f = 0 Hz
forced-ventilated motor
120
50 100 150 200 400 600
Protective Functions
Motor current
%
800
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