Danfoss VLT AutomationDrive FC 302 Programming Manual page 57

Parameter Descriptions
3.3.11.5 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 frequency converter trips when the motor
temperature is too high
Parameter set-up:
Set parameter 1-90 Motor Thermal Protection to [2]
Thermistor Trip
Set parameter 1-93 Thermistor Source to [6] Digital Input
12 13 18 19 27 29 32 33 20 37
PTC / Thermistor
Illustration 3.17 Thermistor Connection
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
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:
NOTICE
This parameter cannot be adjusted
while the motor is running.
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 3-15 Reference 1 Source,
3-16 Reference 2 Source or 3-17 Reference 3
Source).
When using MCB 112, [0] None must always
be selected.
[0] None
[1] Analog Input
53
®
VLT AutomationDrive FC 301/302 Programming Guide
®
OFF
ON
<6.6 k Ω >10.8 k Ω R
MG33MI02 - Rev. 2013-11-20
1-93 Thermistor Source
Option: Function:
[2] Analog Input
54
[3] Digital input 18
[4] Digital input 19
[5] Digital input 32
[6] Digital input 33
NOTICE
Digital input should be set to [0] PNP - Active at 24 V in
5-00 Digital I/O Mode.
1-94 ATEX ETR cur.lim. speed reduction
FC 302 only.
Only visible if parameter 1-90 Motor Thermal Protection is set to
[20].
Range:
0 % [0 - 100 %]
*
The reaction for operating in Ex-e current limit must be
configured.
0%: The frequency converter does not change anything
besides issuing warning 163 ATEX ETR cur.lim.warning.
>0%: The frequency converter issuing warning 163 and
reduces motor speed following ramp 2 (parameter group
3-5* Ramp 2).
Example:
Actual reference = 50 RPM
Parameter 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.
KTY Sensor 1 1 kΩ at 100 °C
[0]
*
KTY Sensor 2 1 kΩ at 25 °C
[1]
KTY Sensor 3 2 kΩ at 25 °C
[2]
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 parameter 3-15 Reference Resource
1 to parameter 3-17 Reference Resource 3).
FC 302 only.
NOTICE
Connection of KTY-sensor between term.
54 and 55 (GND). See Illustration 3.15.
3
Function:
55
3