01/02 AWB8230-1413GB
Programmable relay outputs
K11 to K34
101
Motor thermal overload (THM)
The DF6 frequency inverters simulate a bimetal element to protect
the motor. With its default setting, it exhibits the illustrated
characteristic.
For a detailed description of how to set parameters PNU b012 to
b020 for tripping, see section “Electronic motor protection”,
page 135.
If the motor current is greater than the set tripping current
(dependent on the frequency inverter), the DF6 frequency inverter
issues fault message E05 and switches the output voltage
V
2
2
off. With a relay output configured as THM, the frequency inverter
outputs a signal before issuing the fault message. The THM output
is activated when the motor exceeds the current set under
PNU C061 PNU C061 is the tripping current in %. The magnitude
of the tripping current depends on the tripping characteristic
defined under PNU b013 (
a
section “Electronic motor
protection”, page 135).
X
Under PNU C061, enter the percentage value of the tripping
characteristic at which the THM output is activated.
X
Program one of the relay outputs K23-K24 or K33-K34 as THM
by entering the value 13 in the corresponding PNU (C021 or
C022) or in PNU C026 for signalling relay contacts K11-K12.
Figure 102: Tripping characteristic using a DF6-340-11K as an
example, with the tripping current set to 22 A
t
: Tripping time
I
: Motor current
60
0
25.5 A
116 %
33 A
150 %
44 A
200 %
0.5
[s]
J
1
Figure 103: Relay output K23-K24 configured as THM (motor thermal
overload)
5...30 V
0
.
250 V
D
K23 K24
THM
PNU
Name
Adjustable in RUN mode
Value
Function
WE
Normal
Extended
C061
Thermal
overload
warning
–
j
0 to 100 %
The entered value relates to the tripping characteristic set
under PNU b012 to b020.
When the value set here is exceeded, the digital output
configured as THM is activated.
80
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