3.3.10.5 Klixon
The Klixon type thermal circuit breaker uses a KLIXON
®
metal dish. At a predetermined overload, the heat caused
by the current through the disc causes a trip.
Using a digital input and 24 V as power supply:
Example: The Adjustable frequency drive trips when the
motor temperature is too high
Parameter set-up:
Set
1-90 Motor Thermal Protection
to
Thermistor Trip
[2]
Set
1-93 Thermistor Source
to
Digital Input
[6]
PTC / Thermistor
OFF
ON
+24V
12 13 18
37
32
A
27
19
29
33
B
20
GND
R
<6.6 k Ω >10.8 k Ω
130BA151.11
1-91 Motor External Fan
Option: Function:
[0]
*
No No external fan is required, i.e., the motor is derated
at low speed.
[1]
Yes Applies an external motor fan (external ventilation), so
that no derating of the motor is required at low
speed. The upper curve in graph above (fout = 1 x
fM,N) is followed if the motor current is lower than
nominal motor current (see
1-24 Motor Current
). If the
motor current exceeds nominal current, the operation
time still decreases as if no fan were installed.
1-93 Thermistor Source
Option:
Function:
Select the input to which the thermistor
(PTC sensor) should be connected. An
analog input option [1] or [2] cannot be
selected if the analog input is already in
use as a reference source (selected in
3-15 Reference 1 Source
,
3-16 Reference 2
Source
or
3-17 Reference 3 Source
).
When using MCB 112, choice [0]
None
must always be selected.
[0]
*
None
[1]
Analog input 53
[2]
Analog input 54
[3]
Digital input 18
[4]
Digital input 19
[5]
Digital input 32
[6]
Digital input 33
NOTE!
This parameter cannot be adjusted while the motor is
running.
NOTE!
Digital input should be set to [0]
PNP - Active at 24V
in
5-00 Digital I/O Mode
.
1-94 ATEX ETR cur.lim. speed reduction
FC 302 only.
Only visible if
1-90 Motor Thermal Protection
is set to [20].
Range:
Function:
0.0 %
*
[0.0 - 100.0 %]
The reaction for operating in Ex-e current limit must be
configured.
0%: The Adjustable frequency drive does not change
anything besides issuing warning 163 ATEX ETR
cur.lim.warning.
>0%: The Adjustable frequency drive issuing warning 163
and reduces motor speed following ramp 2 (parameter
group 3-5*).
Example:
Actual reference = 50 RPM
1-94 ATEX ETR cur.lim. speed reduction
= 20%
Resulting reference = 40 RPM
1-95 KTY Sensor Type
Option:
Function:
Select the used type of KTY sensor. FC 302
only.
[0]
*
KTY Sensor 1 1kΩ at 212° F [100° C]
[1]
KTY Sensor 2 1kΩ at 77 °F [25 °C]
[2]
KTY Sensor 3 2kΩ at 77 °F [25 °C]
1-96 KTY Thermistor Resource
Option:
Function:
Selecting analog input terminal 54 to be used
as KTY sensor input. Terminal 54 cannot be
selected as KTY source if otherwise used as
reference (see
3-15 Reference Resource 1
to
3-17 Reference Resource 3
).
FC 302 only.
NOTE!
Connection of KTY sensor between term.
54 and 55 (GND). See picture in section
KTY Sensor Connection
.
[0]
*
None
Parameter Descriptions
FC 300 Programming Guide
MG33MD22 - VLT
®
is a registered Danfoss trademark
3-27
3
3
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