3.3.13.3 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 supply:
Example: The frequency converter trips when the motor
temperature is too high.
Parameter set-up:
•
Set 1-90 Motor Thermal Protection to [2] Thermistor
Trip.
•
Set parameter 1-93 Thermistor Source to [6] Digital
Input.
PTC / Thermistor
OFF
ON
+24V
12 13 18 3732
A
2719 29 33
B
20
GND
R<6.6 k Ω >10.8 k Ω
130BA151.11
Illustration 3.15 Thermistor Connection
1-91 Motor External Fan
Option: Function:
[0] * No No external fan is required, that is the motor is
derated at low speed.
[1] Yes Applies an external motor fan (external ventilation), so
no derating of the motor is required at low speed. The
upper curve in Illustration 3.14 (f
out
= 1 x f
M,N
) is
followed if the motor current is lower than nominal
motor current (see parameter 1-24 Motor Current). If
the motor current exceeds nominal current, the
operation time still decreases as if no fan was
installed.
1-93 Thermistor Source
Option: Function:
NOTICE
This parameter cannot be adjusted
while the motor is running.
NOTICE
Set digital input to [0] PNP - Active at
24 V in parameter 5-00 Digital I/O Mode.
Select the input to which the thermistor (PTC
sensor) should be connected. An analog
input option [1] Analog Input 53 or [2] Analog
Input 54 cannot be selected if the analog
input is already in use as a reference source
(selected in parameter 3-15 Reference 1 Source,
1-93 Thermistor Source
Option: Function:
parameter 3-16 Reference 2 Source or
parameter 3-17 Reference 3 Source).
When using VLT
®
PTC thermistor card MCB
112, [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
Parameter Descriptions Programming Guide
MG11CE02 Danfoss A/S © 03/2015 All rights reserved. 53
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