Danfoss VLT AutomationDrive FC 301 Programming Manual page 78

Parameter Descriptions
•
Set parameter 1-90 Motor Thermal Protection to [2]
Thermistor Trip.
•
Set parameter 1-93 Thermistor Source to [6] Digital
Input.
3 3
12 13 18 19 27 29
PTC / Thermistor
Illustration 3.17 Thermistor Connection
1-91 Motor External Fan
Option:
[0] No
[1] Yes
1-93 Thermistor Resource
Option:
76
VLT
OFF
32 33 20 37
ON
<6.6 k Ω >10.8 k Ω
Function:
No external fan is required, that is
the motor is derated at low speed.
Applies an external motor fan
(external ventilation), so no
derating of the motor is required at
low speed. The upper curve in
Illustration 3.16 (f
out
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.
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 Resource 1,
parameter 3-16 Reference Resource 2,
Danfoss A/S © 10/2019 All rights reserved.
®
AutomationDrive FC 301/302
1-93 Thermistor Resource
Option:
[0]
*
[1]
[2]
R
[3]
[4]
[5]
[6]
1-94 ATEX ETR cur.lim. speed reduction
Range:
0 %
*
= 1 x f ) is
M,N
Configure the reaction for operating in Ex-e current limit.
0%: The frequency converter does not change anything
besides issuing warning 163, ATEX ETR cur.lim.warning.
>0%: The frequency converter issues warning 163, ATEX ETR
cur.lim.warning 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 Thermistor Sensor Type
Option:
[0]
*
[1]
[2]
[3]
Function:
or parameter 3-17 Reference Resource
3).
®
When using VLT
Card MCB 112, always select [0]
None.
None
Analog Input
53
Analog Input
54
Digital input
18
Digital input
19
Digital input
32
Digital input
33
Function:
NOTICE
[0 - 100 %]
Valid for FC 302 only.
Only visible if parameter 1-90 Motor
Thermal Protection is set to [20]
ATEX ETR.
Function:
NOTICE
Valid for FC 302 only.
Select the used type of thermistor
sensor.
1 kΩ at 100 °C (212 °F).
KTY Sensor 1
1 kΩ at 25 °C (77 °F).
KTY Sensor 2
2 kΩ at 25 °C (77 °F).
KTY Sensor 3
Pt1000
PTC Thermistor
M0013101