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
37
32
A
27
19
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
(f
out
= 1 x f
M,N
) is
followed if the motor current is lower than nominal
motor current (see
). 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
3
3