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01/02 AWB8230-1415GB
Programmable digital outputs
11 to 15
115
Motor thermal overload (THM)
The DV6 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
a
Section “Electronic motor
protection“Page 154.
If the motor current is greater than the set tripping current (depen-
dent on the frequency inverter), the DV6 frequency inverter issues
fault message E05 and switches the output voltage
V
2
off. With
a digital output configured as THM, the frequency inverter outputs
a signal before issuing the fault message. The THM output is acti-
vated when the motor exceeds the current set under PNU C061
(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 154).
X
Under PNU C061, enter the percentage value of the tripping
characteristic at which the THM output is activated.
X
Program one of the digital outputs 11 to 15 as THM by entering
the value 13 in the corresponding PNU (C021 to C025) or under
PNU C026 for signalling relay contacts K11-K12.
Figure 120: Example of tripping characteristic using a DV6-340-11K
with the tripping current set at 46 A
t
: Tripping time
I
: Motor current
60
0
26.7 A
116 %
34.5 A
150 %
46 A
200 %
0.5
[s]
t
Figure 121: Digital output 11 configured as THM (motor thermal over-
load)
THM
24 V
50 mA
11
CM2
12
13
14
15
–
+
PNU
Name
Adjustable in RUN mode
Value
Function
WE
Normal
Extended
C061
Thermal over-
load 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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